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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://wiki.asterisk.org/wiki/display/~mjordan?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_ce51dcf276530e4a4b00548e2a6d0905" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/images/icons/macrobrowser/dropdown/section.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Section</span></th>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/images/icons/macrobrowser/dropdown/column.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Column</span></th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <h1 id="ARIandChannels:ManipulatingChannelState-ChannelState" style="margin: 10px 0 0 0; margin-top: 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Channel State</span> </h1> <p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">A channel's state reflects the current state of the path of communication between Asterisk and a device. What state a channel is in also affects what operations are allowed on it and/or how certain operations will affect a device.</span> </p> <p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">While there are many states a channel can be in, the following are the most common:</span> </p>
<ul style="margin: 10px 0 0 0">
<li> <strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Down</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> - a path of communication exists or used to exist between Asterisk and the device, but no media can flow between the two.</span> </li>
<li> <strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Ringing</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> - the device is ringing. Media may or may not be able to flow from Asterisk to the device.</span> </li>
<li> <strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Up</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> - the device has been answered. When in the up state, media can flow bidirectionally between Asterisk and the device.</span> </li>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/images/icons/macrobrowser/dropdown/note.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Note</span></th>
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<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">title</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">More Channel States</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Certain channel technologies, such as DAHDI analog channels, may have additional channel states (such as "Pre-ring" or "Dialing Offhook"). When handling channel state, consult the </span><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+REST+Data+Models#Asterisk12RESTDataModels-Channel" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Channel data model</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> for all possible values.</span> </p> </td>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/images/icons/macrobrowser/dropdown/column.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Column</span></th>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">40%</span></td>
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</table> <h2 id="ARIandChannels:ManipulatingChannelState-IndicatingRinging" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Indicating Ringing</span> </h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Asterisk can inform a device that it should start playing a ringing tone back to the caller using the </span><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+Channels+REST+API#Asterisk12ChannelsRESTAPI-ring" rel="nofollow" style="color: #3b73af; text-decoration: none"><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">POST /channels/{channel_id}/ring</span></code></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> operation. Likewise, ringing can be stopped using the </span><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+Channels+REST+API#Asterisk12ChannelsRESTAPI-ringStop" rel="nofollow" style="color: #3b73af; text-decoration: none"><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">DELETE /channels/{channel_id}/ring</span></code></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> operation. Note that indicating ringing typically does not actually transmit media from Asterisk to the device in question - Asterisk merely signals the device to ring. It is up to the device itself to actually play something back for the user.</span> </p> <h2 id="ARIandChannels:ManipulatingChannelState-AnsweringaChannel" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Answering a Channel</span> </h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">When a channel isn't answered, Asterisk has typically not yet informed the device how it will communicate with it. Answering a channel will cause Asterisk to complete the path of communication, such that media flows bi-directionally between the device and Asterisk.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">You can answer a channel using the </span><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+Channels+REST+API#Asterisk12ChannelsRESTAPI-answer" rel="nofollow" style="color: #3b73af; text-decoration: none"><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">POST /channels/{channel_id}/answer</span></code></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> operation.</span> </p> <h2 id="ARIandChannels:ManipulatingChannelState-Hangingupachannel" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Hanging up a channel</span> </h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">You can hang up a channel using the </span><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+Channels+REST+API#Asterisk12ChannelsRESTAPI-hangup" rel="nofollow" style="color: #3b73af; text-decoration: none"><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">DELETE /channels/{channel_id}</span></code></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> operation. When this occurs, the path of communication between Asterisk and the device is terminated, and the channel will leave the Stasis application. Your application will be notified of this via a </span><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+REST+Data+Models#Asterisk12RESTDataModels-StasisEnd" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The same is true if the device initiates the hang up. In the same fashion, the path of communication between Asterisk and the device is terminated, the channel is hung up, and your application is informed that the channel is leaving your application via a </span><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+REST+Data+Models#Asterisk12RESTDataModels-StasisEnd" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Generally, once a channel leaves your application, you won't receive any more events about the channel. There are times, however, when you may be subscribed to all events coming from a channel - regardless if that channel is in your application or not. In that case, a </span><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+REST+Data+Models#Asterisk12RESTDataModels-ChannelDestroyed" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ChannelDestroyed</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event will inform you when the channel is well and truly dead.</span> </p> <h1 id="ARIandChannels:ManipulatingChannelState-Example:ManipulatingChannelState" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Example: Manipulating Channel State</span> </h1> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">For this example, we're going to write an ARI application that will do the following:</span> </p>
<ol class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Wait for a channel to enter its Stasis application.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">When a channel enters its Stasis application, it will indicate ringing to the channel. If the channel wasn't already ringing, it will now!</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">After a few seconds, it will answer the channel.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Once the channel is answered, we'll start silence on the channel so that the user feels a comfortable whishing noise. Then, after a few more seconds, we'll hangup the channel.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">If at any point in time the phone hangs up first, we'll gracefully handle that.</span> </li>
</ol> <h2 id="ARIandChannels:ManipulatingChannelState-Dialplan" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Dialplan</span> </h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">For this example, we need to just drop the channel into Stasis, specifying our application:</span> </p>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">exten => 1000,1,NoOp()
same => n,Stasis(channel-state)
same => n,Hangup() </span>
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</table> <h2 id="ARIandChannels:ManipulatingChannelState-Python" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Python</span> </h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">This example will use the </span><a class="external-link" href="https://github.com/asterisk/ari-py" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ari-py</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> library. The basic structure is very similar to the </span><a href="https://wiki.asterisk.org/wiki/display/%7Emjordan/Draft%3A+ARI+Channels+Introduction#Draft:ARIChannelsIntroduction-Python" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-dump Python example</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> - see that example for more information on the basics of setting up an ARI connection using this library.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">To start, once our ARI client has been set up, we will want to register handlers for three different events - </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisStart</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">, </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ChannelStateChange</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">, and </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">.</span> </p>
<ol class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The bulk of the work will be done in </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisStart</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">, which is called when the channel enters our application. For the most part, this will involve setting up Python timers to initiate actions on the channel.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ChannelStateChange</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> handler will merely print out the channel state changes for us, which is informative as it will tell us when the channel is answered.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Finally, the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event will clean up for us by cancelling any pending timers that we initiated. This will get called when the channel leaves our application - which will happen when the user hangs up the channel, or when we hang up the channel.</span> </li>
</ol> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We can store the timers that we've set up for a channel using a dictionary of channel IDs to timer instances:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">11</span></td>
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<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel_timers = {}</span>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">And we can register for our three events:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">58</span></td>
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<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">client.on_channel_event('StasisStart', stasis_start_cb)
client.on_channel_event('ChannelStateChange', channel_state_change_cb)
client.on_channel_event('StasisEnd', stasis_end_cb)</span>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisStart</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event is the most interesting part.</span> </p>
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<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">First, we tell the channel to ring, and after two seconds, to answer the channel:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">47</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> channel.ring()
# Answer the channel after 2 seconds
timer = threading.Timer(2, answer_channel, [channel])
channel_timers[channel.id] = timer
timer.start()</span>
</pre> </td>
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</tbody>
</table> <p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">If we didn't have that there, then the caller would probably just have dead space to listen to! Not very enjoyable. We store the timer in the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel_timers</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> dictionary so that our </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event can cancel it for us if the user hangs up the phone.</span> </p> </li>
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Once we're in the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">answer_channel</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> handler, we answer the channel and start silence on the channel. That (hopefully) gives them a slightly more ambient silence noise. Note that we'll go ahead and declare </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">answer_channel</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> as a nested function inside our </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisStart</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> handler, </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">stasis_start_cb</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">linenumbers</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">language</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">py</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">firstline</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">24</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">def stasis_start_cb(channel_obj, ev):
"""Handler for StasisStart event"""
def answer_channel(channel):
"""Callback that will actually answer the channel"""
print "Answering channel %s" % channel.json.get('name')
channel.answer()
channel.startSilence()</span>
</pre> </td>
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</tbody>
</table> </li>
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">After we've answered the channel, we kick off another Python timer to hang up the channel in 4 seconds. When that timer fires, it will call </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">hangup_channel</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">. This does the final action on the channel by hanging it up. Again, we'll declare </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">hangup_channel</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> as a nested function inside our </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisStart</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> handler:</span> </p>
<table class="diff-macro diff-html-added" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">py</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">38</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> def hangup_channel(channel):
"""Callback that will actually hangup the channel"""
print "Hanging up channel %s" % channel.json.get('name')
channel.hangup()</span>
</pre> </td>
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</tbody>
</table> </li>
</ol> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">When we create a timer - such as when we started ringing on the channel - we stored it in our </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel_timers</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> dictionary. In our </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event handler, we'll want to cancel any pending timers. Otherwise, our timers may fire and try to perform an action on channel that has already left our Stasis application, which is a good way to get an HTTP error response code.</span> </p>
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">py</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">13</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> def stasis_end_cb(channel, ev):
"""Handler for StasisEnd event"""
print "Channel %s just left our application" % channel.json.get('name')
# Cancel any pending timers
timer = channel_timers.get(channel.id)
if timer:
timer.cancel()
del channel_timers[channel.id]</span>
</pre> </td>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Finally, we want to print out the state of the channel in the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ChannelStateChanged</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> handler. This will tell us exactly when our channel has been answered:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">py</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">53</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> def channel_state_change_cb(channel, ev):
"""Handler for changes in a channel's state"""
print "Channel %s is now: %s" % (channel.json.get('name'),
channel.json.get('state'))</span>
</pre> </td>
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</table> <h3 id="ARIandChannels:ManipulatingChannelState-channel-state.py" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.py</span> </h3> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The full source code for </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.py</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> is shown below:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.py</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">py</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">#!/usr/bin/env python
import ari
import logging
import threading
logging.basicConfig(level=logging.ERROR)
client = ari.connect('http://localhost:8088', 'asterisk', 'asterisk')
channel_timers = {}
def stasis_end_cb(channel, ev):
"""Handler for StasisEnd event"""
print "Channel %s just left our application" % channel.json.get('name')
# Cancel any pending timers
timer = channel_timers.get(channel.id)
if timer:
timer.cancel()
del channel_timers[channel.id]
def stasis_start_cb(channel_obj, ev):
"""Handler for StasisStart event"""
def answer_channel(channel):
"""Callback that will actually answer the channel"""
print "Answering channel %s" % channel.json.get('name')
channel.answer()
channel.startSilence()
# Hang up the channel in 4 seconds
timer = threading.Timer(4, hangup_channel, [channel])
channel_timers[channel.id] = timer
timer.start()
def hangup_channel(channel):
"""Callback that will actually hangup the channel"""
print "Hanging up channel %s" % channel.json.get('name')
channel.hangup()
channel = channel_obj.get('channel')
print "Channel %s has entered the application" % channel.json.get('name')
channel.ring()
# Answer the channel after 2 seconds
timer = threading.Timer(2, answer_channel, [channel])
channel_timers[channel.id] = timer
timer.start()
def channel_state_change_cb(channel, ev):
"""Handler for changes in a channel's state"""
print "Channel %s is now: %s" % (channel.json.get('name'),
channel.json.get('state'))
client.on_channel_event('StasisStart', stasis_start_cb)
client.on_channel_event('ChannelStateChange', channel_state_change_cb)
client.on_channel_event('StasisEnd', stasis_end_cb)
client.run(apps='channel-state')</span>
</pre> </td>
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</tbody>
</table> <h3 id="ARIandChannels:ManipulatingChannelState-channel-state.pyinaction" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.py in action</span> </h3> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Here, we see the output from the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.py</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> script when a PJSIP channel for endpoint 'alice' enters into the application:</span> </p>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Channel PJSIP/alice-00000001 has entered the application
Answering channel PJSIP/alice-00000001
Channel PJSIP/alice-00000001 is now: Up
Hanging up channel PJSIP/alice-00000001
Channel PJSIP/alice-00000001 just left our application</span>
</pre> </td>
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</table> <h2 id="ARIandChannels:ManipulatingChannelState-JavaScript(Node.js)" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">JavaScript (Node.js)</span> </h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">This example will use the </span><a href="https://github.com/asterisk/node-ari-client" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ari-client</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> library. The basic structure is very similar to the </span><a href="https://wiki.asterisk.org/wiki/display/%7Emjordan/Draft%3A+ARI+Channels+Introduction#Draft:ARIChannelsIntroduction-JavaScript%28Node.js%29" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-dump JavaScript example</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> - see that example for more information on the basics of setting up an ARI connection using this library.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">To start, once our ARI client has been set up, we will want to register callbakcs for three different events - </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisStart</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">, </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ChannelStateChange</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">, and </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">.</span> </p>
<ol class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The bulk of the work will be done in </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisStart</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">, which is called when the channel enters our application. For the most part, this will involve setting up JavaScript timeouts to initiate actions on the channel.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ChannelStateChange</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> handler will merely print out the channel state changes for us, which is informative as it will tell us when the channel is answered.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Finally, the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event will clean up for us by cancelling any pending timeouts that we initiated. This will get called when the channel leaves our application - which will happen when the user hangs up the channel, or when we hang up the channel.</span> </li>
</ol> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We can store the timeouts that we've set up for a channel using an object of channel IDs to timer instances:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">linenumbers</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">language</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">firstline</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">7</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">timers = {}</span>
</pre> </td>
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</tbody>
</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">And we can register for our three events:</span> </p>
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">linenumbers</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">language</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">firstline</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">76</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">client.on_channel_event('StasisStart', stasis_start_cb)
client.on_channel_event('ChannelStateChange', channel_state_change_cb)
client.on_channel_event('StasisEnd', stasis_end_cb)</span>
</pre> </td>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisStart</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event is the most interesting part.</span> </p>
<ol class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">First, we tell the channel to ring, and after two seconds, to answer the channel:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">linenumbers</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">language</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">firstline</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">21</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel.ring(function(err) {
if (err) {
throw err;
}
});
// answer the channel after 2 seconds
var timer = setTimeout(answer, 2000);
timers[channel.id] = timer;</span>
</pre> </td>
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</tbody>
</table> <p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">If we didn't have that there, then the caller would probably just have dead space to listen to! Not very enjoyable. We store the timer in the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">timers</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> object so that our </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event can cancel it for us if the user hangs up the phone.</span> </p> </li>
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Once we're in the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">answer</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> callback, we answer the channel and start silence on the channel. That (hopefully) gives them a slightly more ambient silence noise:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">firstline</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">30</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">// callback that will answer the channel
function answer() {
console.log(util.format('Answering channel %s', channel.name));
channel.answer(function(err) {
if (err) {
throw err;
}
});
channel.startSilence(function(err) {
if (err) {
throw err;
}
});
// hang up the channel in 4 seconds
var timer = setTimeout(hangup, 4000);
timers[channel.id] = timer;
}</span>
</pre> </td>
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<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">After we've answered the channel, we kick off another timer to hang up the channel in 4 seconds. When that timer fires, it will call </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">the hangup callback</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">. This does the final action on the channel by hanging it up:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">linenumbers</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">language</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">firstline</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">48</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">// callback that will hangup the channel
function hangup() {
console.log(util.format('Hanging up channel %s', channel.name));
channel.hangup(function(err) {
if (err) {
throw err;
}
});
}</span>
</pre> </td>
</tr>
</tbody>
</table> </li>
</ol> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">When we create a timer - such as when we started ringing on the channel - we stored it in our </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">timers</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> object. In our </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">StasisEnd</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> event handler, we'll want to cancel any pending timers. Otherwise, our timers may fire and try to perform an action on channel that has already left our Stasis application, which is a good way to get an HTTP error response code.</span> </p>
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
<thead>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</span></th>
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<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
<tbody>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">linenumbers</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">language</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">firstline</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">59</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">// handler for StasisEnd event
function stasisEnd(event, channel) {
console.log(util.format(
'Channel %s just left our application', channel.name));
var timer = timers[channel.id];
if (timer) {
clearTimeout(timer);
delete timers[channel.id];
}
} </span>
</pre> </td>
</tr>
</tbody>
</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Finally, we want to print out the state of the channel in the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ChannelStateChanged</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> callback. This will tell us exactly when our channel has been answered:</span> </p>
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
<thead>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</span></th>
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<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">linenumbers</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">language</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">firstline</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">70</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">// handler for ChannelStateChange event
function channelStateChange(event, channel) {
console.log(util.format(
'Channel %s is now: %s', channel.name, channel.state));
}</span>
</pre> </td>
</tr>
</tbody>
</table> <h3 id="ARIandChannels:ManipulatingChannelState-channel-state.js" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.js</span> </h3> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"></p>
<table class="diff-macro bodyless diff-html-added" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;margin: 5px 0; padding: 0; width: auto;background-color: #ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.js</span></td>
</tr>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.js</span></td>
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</tbody>
</table> </td>
</tr>
</tbody>
</table> <p style="margin: 10px 0 0 0"></p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The full source code for </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.js</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> is shown below:</span> </p>
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
<thead>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</span></th>
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<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">title</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">linenumbers</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">language</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
</tr>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">/*jshint node: true*/
'use strict';
var ari = require('ari-client');
var util = require('util');
var timers = {};
ari.connect('http://localhost:8088', 'asterisk', 'asterisk', clientLoaded);
// handler for client being loaded
function clientLoaded (err, client) {
if (err) {
throw err;
}
// handler for StasisStart event
function stasisStart(event, channel) {
console.log(util.format(
'Channel %s has entered the application', channel.name));
channel.ring(function(err) {
if (err) {
throw err;
}
});
// answer the channel after 2 seconds
var timer = setTimeout(answer, 2000);
timers[channel.id] = timer;
// callback that will answer the channel
function answer() {
console.log(util.format('Answering channel %s', channel.name));
channel.answer(function(err) {
if (err) {
throw err;
}
});
channel.startSilence(function(err) {
if (err) {
throw err;
}
});
// hang up the channel in 4 seconds
var timer = setTimeout(hangup, 4000);
timers[channel.id] = timer;
}
// callback that will hangup the channel
function hangup() {
console.log(util.format('Hanging up channel %s', channel.name));
channel.hangup(function(err) {
if (err) {
throw err;
}
});
}
}
// handler for StasisEnd event
function stasisEnd(event, channel) {
console.log(util.format(
'Channel %s just left our application', channel.name));
var timer = timers[channel.id];
if (timer) {
clearTimeout(timer);
delete timers[channel.id];
}
}
// handler for ChannelStateChange event
function channelStateChange(event, channel) {
console.log(util.format(
'Channel %s is now: %s', channel.name, channel.state));
}
client.on('StasisStart', stasisStart);
client.on('StasisEnd', stasisEnd);
client.on('ChannelStateChange', channelStateChange);
client.start('channel-state');
}</span>
</pre> </td>
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</tbody>
</table> <h3 id="ARIandChannels:ManipulatingChannelState-channel-state.jsinaction" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.js in action</span> </h3> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Here, we see the output from the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-state.js</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> script when a PJSIP channel for endpoint 'alice' enters into the application:</span> </p>
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
<thead>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</span></th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Channel PJSIP/alice-00000001 has entered the application
Answering channel PJSIP/alice-00000001
Channel PJSIP/alice-00000001 is now: Up
Hanging up channel PJSIP/alice-00000001
Channel PJSIP/alice-00000001 just left our application</span>
</pre> </td>
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<td class="actions-pattern-action-icon-container" style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 0px; vertical-align: middle"><a href="https://wiki.asterisk.org/wiki/display/AST/ARI+and+Channels%3A+Manipulating+Channel+State?src=email" title="View page" style="color: #3b73af; text-decoration: none"><img class="actions-pattern-action-icon-image" src="cid:confluence.mail.templates.view.page" alt="View page-icon" title="View page-icon" height="16" width="16" border="0" style="vertical-align: middle" /></a></td>
<td class="actions-pattern-action-text-container" style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 4px; padding-left: 5px; white-space: nowrap"><a href="https://wiki.asterisk.org/wiki/display/AST/ARI+and+Channels%3A+Manipulating+Channel+State?src=email" title="View page" style="color: #3b73af; text-decoration: none">View page</a></td>
<td class="actions-pattern-action-bull" style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 4px; color: #999; padding: 0 5px">•</td>
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