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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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<td id="page-title-pattern-icon-image-container-cell" style="padding: 0px; border-collapse: collapse; width: 16px; padding: 9px 8px 0px 0px; mso-text-raise: 5px; mso-line-height-rule: exactly"><a href="https://wiki.asterisk.org/wiki/display/AST/ARI+and+Media%3A+Part+2+-+Recording?src=email" title="page icon" style="vertical-align: top;; color: #3b73af; text-decoration: none"><img style="vertical-align: top; display: block;" src="cid:page-icon" alt="page icon" title="page icon" height="16" width="16" border="0" /></a></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"> <h1 id="ARIandMedia:Part2-Recording-TheRecordingAPI" 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-changed" id="changed-diff-0" style="background-color: #d6f0ff;">The Recording API</span> </h1> <p style="margin: 10px 0 0 0"> <span class="confluence-link">Recordings</span> in ARI are divided into two main categories: live and stored. Live recordings are those that are currently being recorded on a channel or bridge, and stored recordings are recordings that have been completed and saved to the file system. The API for the <code style="font-family: monospace">/recordings</code> resource can be found <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">here</a>.</p> <p style="margin: 10px 0 0 0">Live recordings can be manipulated as they are being made, with options to manipulate the flow of audio such as muting, pausing, stopping, or canceling the recording. Stored recordings are simply files on the file system on which Asterisk is installed. The location of stored recordings is in the <code style="font-family: monospace">/recording</code> subdirectory of the configured <code style="font-family: monospace">astspooldir</code> in <code style="font-family: monospace">asterisk.conf</code>. By default, this places recordings in <code style="font-family: monospace">/var/spool/asterisk/recording</code>.</p> <p style="margin: 10px 0 0 0">Channels can have their audio recorded using the <a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Channels+REST+API#Asterisk13ChannelsRESTAPI-record" rel="nofollow" style="color: #3b73af; text-decoration: none"><code style="font-family: monospace">/channels/{channelId}/record</code></a> resource, and Bridges can have their audio recorded using the <code style="font-family: monospace"><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Bridges+REST+API#Asterisk13BridgesRESTAPI-record" rel="nofollow" style="color: #3b73af; text-decoration: none">/bridges/{bridgeId}/record</a></code> resource.</p> <h1 id="ARIandMedia:Part2-Recording-VoiceMailApplicationSkeleton" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" id="changed-diff-1" style="background-color: #d6f0ff;">Voice Mail Application Skeleton</span> </h1> <p style="margin: 10px 0 0 0">Our application to record voice mails will be based on the following skeleton. As we add new features, we will create new states for our state machine, and add a few extra lines to our application skeleton in order to link the states together appropriately.</p> </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">40%</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">title</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">On this Page</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">maxLevel</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">2</td>
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</table> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-context" style="margin: 10px 0 0 0">This way, when calling any three-digit extension that begins with the number '3', the user will call into the application with the mailbox dialled (e.g. dialling "305" will allow the user to leave a message for mailbox "305").</p> <h1 id="ARIandMedia:Part2-Recording-BasicVoiceMailRecording" class="diff-block-target" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" id="changed-diff-2" style="background-color: #d6f0ff;">Basic Voice Mail Recording</span> </h1> <p class="diff-block-context" style="margin: 10px 0 0 0">We've seen a lot of the underlying concepts for our application, so let's actually make something useful now. We'll start with a very simple application that allows callers to record a message upon entering the application. When the caller has completed recording the message, the caller may press the '#' key or may hang up to accept the recording. Here is a state machine diagram for the application:</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</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">Reader Exercise 2</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"> <code style="font-family: monospace">EndingState</code> and <code style="font-family: monospace">HungUpState</code> don't do much of anything at the moment. States like these can be great in voice mail applications for updating the message-waiting state of mailboxes on a system. If you're feeling industrious, read the API for the <code style="font-family: monospace">/mailboxes</code> resource in ARI. Try to change <code style="font-family: monospace">HungUpState</code> and <code style="font-family: monospace">EndingState</code> to update the message-waiting status of a mailbox when a new message is left. To keep the exercise simple, for now you can assume the following:</p>
<ul style="margin: 10px 0 0 0">
<li>The number of "old" messages in a mailbox is always 0</li>
<li>Since you are more concerned with alerting the mailbox owner that there exist new messages, do not try to count the messages in the mailbox. Instead, just state that there is 1 new message.</li>
</ul> </td>
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</table> <h1 id="ARIandMedia:Part2-Recording-CancellingaRecording" class="diff-block-target" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" id="changed-diff-3" style="background-color: #d6f0ff;">Cancelling a Recording</span> </h1> <p class="diff-block-context" style="margin: 10px 0 0 0">Now we have a simple application set up to record a message, but it's pretty bare at the moment. Let's start expanding some. One feature we can add is the ability to press a DTMF key while recording a voice mail to cancel the current recording and re-start the recording process. We'll use the DTMF '*' key to accomplish this. The updated state machine diagram looks like the following:</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p>
<table class="diff-macro diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; 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="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5635/60fd2eb45debbf4ede2b669f4c9b96b4ce40a937.48/_/images/icons/macrobrowser/dropdown/panel.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Panel</th>
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<td class="diff-macro-properties" style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding: 0; border: 1px solid #dddddd;; padding: 0px; border-collapse: collapse">
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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">bgColor</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">silver</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">titleBGColor</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">seagreen</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">borderStyle</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">solid</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">title</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">Reader Exercise 4</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">titleColor</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">black</td>
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</table> </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">Our application provides the ability to cancel recordings and re-record them, but it gives no ability to cancel the recording and end the call.</p> <p style="margin: 10px 0 0 0">Modify the <code style="font-family: monospace">RecordingState</code> to allow for a DTMF digit of your choice to cancel the recording and end the call.</p> </td>
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</table> <h1 id="ARIandMedia:Part2-Recording-OperatingonStoredRecordings" class="diff-block-target" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" id="changed-diff-4" style="background-color: #d6f0ff;">Operating on Stored Recordings</span> </h1> <p class="diff-block-context" style="margin: 10px 0 0 0">So far, we've recorded a channel, stopped a live recording, and cancelled a live recording. Now let's turn our attention to operations that can be performed on stored recordings. An obvious operation to start with is to play back the stored recording. We're going to make another modification to our voice mail recording application that adds a "reviewing" state after a voicemail is recorded. In this state, a user that has recorded a voice mail will hear the recorded message played back to him/her. The user may press the '#' key or hang up in order to accept the recorded message, or the user may press '*' to erase the stored recording and record a new message in its place. Below is the updated state diagram with the new "reviewing" state added.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p>
<table class="diff-macro diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5635/60fd2eb45debbf4ede2b669f4c9b96b4ce40a937.48/_/images/icons/macrobrowser/dropdown/panel.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Panel</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">bgColor</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">silver</td>
</tr>
<tr>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">titleBGColor</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">seagreen</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">borderStyle</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">solid</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">title</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">Reader Exercise 5</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">titleColor</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">black</td>
</tr>
</tbody>
</table> </td>
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<tbody>
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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">In the previous section we introduced the ability to delete a stored recording. Stored recordings have a second operation available to them: <a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Recordings+REST+API#Asterisk13RecordingsRESTAPI-copyStored" rel="nofollow" style="color: #3b73af; text-decoration: none">copying</a>. The <code style="font-family: monospace">copy()</code> method of a stored recording can be used to copy the stored recording from one location to another.</p> <p style="margin: 10px 0 0 0">For this exercise modify <code style="font-family: monospace">ReviewingState</code> to let a DTMF key of your choice copy the message to a different mailbox on the system. When a user presses this DTMF key, the state machine should transition into a new state called "copying." The "copying" state should gather DTMF from the user to determine which mailbox the message should be copied to. If '#' is entered, then the message is sent to the mailbox the user has typed in. If '*' is entered, then the copying operation is cancelled. Both a '#' and a '*' should cause the state machine to transition back into <code style="font-family: monospace">ReviewingState</code>.</p> <p style="margin: 10px 0 0 0">As an example, let's say that you have set DTMF '0' to be the key that the user presses in <code style="font-family: monospace">ReviewingState</code> to copy the message. The user presses '0'. The user then presses '3' '2' '0' '#'. The message should be copied to mailbox "320", and the user should start hearing the message played back again. Now let's say the user presses '0' to copy the message again. The user then presses '3' '2' '1' '0' '*'. The message should not be copied to any mailbox, and the user should start hearing the message played back again.</p> </td>
</tr>
</tbody>
</table> <h1 id="ARIandMedia:Part2-Recording-RecordingBridges" class="diff-block-target" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" id="changed-diff-5" style="background-color: #d6f0ff;">Recording Bridges</span> </h1> <p class="diff-block-context" style="margin: 10px 0 0 0">This discussion of recordings has focused on recording channel audio. It's important to note that bridges also have an option to be recorded. What's the difference? Recording a channel's audio records only the audio coming <strong>from</strong> a channel. Recording a bridge records the mixed audio coming from all channels into the bridge. This means that if you are attempting to do something like record a conversation between participants in a phone call, you would want to record the audio in the bridge rather than on either of the channels involved.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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