<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> 
<base href="https://wiki.asterisk.org/wiki" /> 
<title>Message Title</title>  
<style type="text/css">@media only screen and (max-device-width: 480px) {.mobile-only {
        width: auto !important;
        height: auto !important;
        overflow: visible !important;
        line-height: normal !important;
        font-size: inherit !important;
        mso-hide: all;
}

.desktop-only {
        display: none !important;
}

/* iPhone 3GS fix for unwanted 20px right margin */
body { min-width: 100% !important; padding: 0; margin: 0; }

#center-content-table { max-width: none; !important; }
#header-pattern-container { padding: 10px 10px 10px 10px !important; line-height: 20px !important; }
#header-avatar-image-container { padding-right: 8px !important; }
#email-content-container { padding: 0 !important; }
.mobile-expand { border-radius: 0 !important; border-left: 0 !important; border-right: 0 !important; padding-left: 26px !important;}
.mobile-resize-text { font-size: 16px !important; line-height: 22px !important; }
#page-title-pattern-header { font-size: 20px !important; line-height: 28px !important; }
#page-title-pattern-icon-image-container-cell { padding-top: 7px !important; }
#inline-user-pattern { display: block !important; }
#inline-user-pattern-avatar { padding-top: 3px !important; }
.contextual-area-pattern { border-bottom: 1px solid #ccc !important; padding: 15px 10px 0 10px !important;}
.users-involved-pattern-column-table { width: 100% !important;  }
.users-involved-pattern-avatar-table-cell { padding: 3px 5px 5px 0 !important; }
.users-involved-pattern-column-container { padding-right: 0 !important; }
.contextual-excerpt-pattern, #users-involved-pattern { border: 0 !important; }

/** Aui Typography upsized for mobile **/
#content-excerpt-pattern-container, #contextual-excerpt-pattern-text-container { font-size: 16px !important; line-height: 22px !important; }
#content-excerpt-pattern-container h1, #contextual-excerpt-pattern-text-container h1 { font-size: 24px !important; line-height: 28px !important; }
#content-excerpt-pattern-container h2, #contextual-excerpt-pattern-text-container h2 { font-size: 20px !important; line-height: 28px !important; }
#content-excerpt-pattern-container h3, #contextual-excerpt-pattern-text-container h3 { font-size: 18px !important; line-height: 24px !important; }
#content-excerpt-pattern-container h4, #contextual-excerpt-pattern-text-container h4 { font-size: 16px !important; line-height: 22px !important; }
#content-excerpt-pattern-container h5, #contextual-excerpt-pattern-text-container h5 { font-size: 14px !important; line-height: 20px !important; }
#content-excerpt-pattern-container h6, #contextual-excerpt-pattern-text-container h6 { font-size: 14px !important; line-height: 20px !important; }
.user-mention { line-height: 18px !important; }
/** Aui Typography end **/

/* Show appropriate footer logo on mobile, display links vertically */
#footer-pattern { padding: 15px 10px !important; }
#footer-pattern-logo-desktop-container { padding: 0 !important; }
#footer-pattern-logo-desktop { width: 0 !important; height: 0 !important; }
#footer-pattern-logo-mobile {
    padding-top: 10px !important;
    width: 30px !important;
    height: 27px !important;
    display: inline !important;
}
#footer-pattern-text {
    display: block !important;
}
#footer-pattern-links-container { line-height: 0 !important;}
.footer-pattern-links.mobile-resize-text,
.footer-pattern-links.mobile-resize-text,
#footer-pattern-text.mobile-resize-text,
#footer-pattern-links-container.no-footer-links {
    font-size: 14px !important;
    line-height: 20px !important;
}
.footer-link { display: block !important; }
#footer-pattern-links-container table { display: inline-block !important; float: none !important; }
#footer-pattern-links-container, #footer-pattern-text { text-align: center !important; }
#footer-pattern-links { padding-bottom: 5px !important; }

/** Team Calendar overrides, these should be removed when notifications are updated in Team Calendars. For now CSS
    overrides are being used because the structure of the content can't change without rereleasing the plugin */
.mail-calendar-container .day-header + table tr td:first-child {
    vertical-align: top !important;
    padding-top: 5px !important;
}}
@media (min-width: 900px) {#center-content-table { width: 900px; }}
@media all {#outlook a {padding:0;} /* Force Outlook to provide a "view in browser" menu link. */
/* Prevent Webkit and Windows Mobile platforms from changing default font sizes.*/
body{-webkit-text-size-adjust:100%; -ms-text-size-adjust:100%;}
.ExternalClass {width:100%;} /* Force Hotmail to display emails at full width */
#background-table {margin:0; padding:0; width:100% !important; }
/* Needed to override highlighting on date and time links in iOS */
.grey a {color: #707070; text-decoration: none; }}
</style> 
</head>
<body>
<table id="background-table" cellpadding="0" cellspacing="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; background-color: #f5f5f5"> 
<tbody> 
<tr> 
<td id="header-pattern-container" style="padding: 0px; border-collapse: collapse; padding: 10px 20px"> 
<table id="header-pattern" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<tbody> 
<tr> 
<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>
<td id="header-text-container" valign="middle" style="padding: 0px; border-collapse: collapse; vertical-align: middle; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 1px">Matt Jordan <strong>edited</strong> a page</td> 
</tr> 
</tbody> 
</table> </td> 
</tr> 
<!-- End Header pattern --> 
<tr> 
<td id="email-content-container" style="padding: 0px; border-collapse: collapse; padding: 0 20px"> 
<table id="email-content-table" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; border-spacing: 0; border-collapse: separate"> 
<tbody> 
<tr> 
<td class="email-content-rounded-top mobile-expand" style="padding: 0px; border-collapse: collapse; color: #fff; padding: 0 15px 0 16px; height: 15px; background-color: #fff; border-left: 1px solid #ccc; border-top: 1px solid #ccc; border-right: 1px solid #ccc; border-bottom: 0; border-top-right-radius: 5px; border-top-left-radius: 5px"> </td> 
</tr> 
<tr> 
<td class="email-content-main mobile-expand" style="padding: 0px; border-collapse: collapse; border-left: 1px solid #ccc; border-right: 1px solid #ccc; border-top: 0; border-bottom: 0; padding: 0 15px 15px 16px; background-color: #fff"> 
<table id="page-title-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<tbody> 
<tr> 
<td id="page-title-pattern-icon-image-container" valign="top" style="padding: 0px; border-collapse: collapse; width: 16px; vertical-align: top"> 
<table cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<tbody> 
<tr> 
<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+Channels%3A+Handling+DTMF?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> 
</tr> 
</tbody> 
</table> </td>
<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" id="page-title-pattern-header-container"><span id="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"><a href="https://wiki.asterisk.org/wiki/display/AST/ARI+and+Channels%3A+Handling+DTMF?src=email" title="ARI and Channels: Handling DTMF" style="color: #3b73af; text-decoration: none">ARI and Channels: Handling DTMF</a></span></td> 
</tr> 
</tbody> 
</table> </td> 
</tr> 
<tr> 
<td class="email-content-main mobile-expand" style="padding: 0px; border-collapse: collapse; border-left: 1px solid #ccc; border-right: 1px solid #ccc; border-top: 0; border-bottom: 0; padding: 0 15px 15px 16px; background-color: #fff"> 
<table class="content-excerpt-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 1px"> 
<tbody> 
<tr> 
<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p> 
<table class="diff-macro diff-block-target" 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> 
<tr> 
<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-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th> 
</tr> 
</thead> 
<tbody> 
<tr> 
<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"> 
<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<tbody> 
<tr> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">linenumbers</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">true</td> 
</tr> 
<tr> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">language</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">py</td> 
</tr> 
<tr> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">firstline</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">70</td> 
</tr> 
</tbody> 
</table> </td> 
</tr> 
</tbody> 
<tbody> 
<tr> 
<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">    def queue_up_sound(channel, menu_state):
        """Start up the next sound and handle whatever happens
        Keywords Arguments:
        channel    The channel in the IVR
        menu_state The current state of the menu
        """

        def menu_timeout(channel):
            """Callback called by a timer when the menu times out"""
            <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">print 'Channel %s stopped paying attention...' % </span>channel.<span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">json.get('name')
            channel.</span>play(media='sound:are-you-still-there')
            play_intro_menu(channel)

        def cancel_menu(channel, ev, current_playback, menu_state):
            """Cancel the menu, as the user did something"""
            menu_state.complete = True
            try:
                current_playback.stop()
            except:
                pass
            return

        current_playback = play_next_sound(menu_state)
        if not current_playback:
            if menu_state.current_sound == len(sounds):
                # Menu played, start a timer!
                timer = threading.Timer(10, menu_timeout, [channel])
                channel_timers[channel.id] = timer
                timer.start()
            return

        menu_state.current_sound += 1
        current_playback.on_event('PlaybackFinished', on_playback_finished,
                                  callback_args=[menu_state])

        # If the user hits a key or hangs up, cancel the menu operations
        channel.on_event('ChannelDtmfReceived', cancel_menu,
                         callback_args=[current_playback, menu_state])
        channel.on_event('StasisEnd', cancel_menu,
                         callback_args=[current_playback, menu_state])</pre> </td> 
</tr> 
</tbody> 
</table> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> 
<table class="diff-macro diff-block-target" 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> 
<tr> 
<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-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th> 
</tr> 
</thead> 
<tbody> 
<tr> 
<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"> 
<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<tbody> 
<tr> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">linenumbers</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">true</td> 
</tr> 
<tr> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">language</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">py</td> 
</tr> 
<tr> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">firstline</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">150</td> 
</tr> 
</tbody> 
</table> </td> 
</tr> 
</tbody> 
<tbody> 
<tr> 
<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">def on_dtmf_received(channel, ev):
    """Our main DTMF handler for a channel in the IVR

    Keyword Arguments:
    channel The channel in the IVR
    digit   The DTMF digit that was pressed
    """

    # Since they pressed something, cancel the timeout timer
    cancel_timeout(channel)
    digit = int(ev.get('digit'))

    print 'Channel %s entered %d' % (channel.json.get('name'), digit)
    if digit == 1:
        handle_extension_one(channel)
    elif digit == 2:
        handle_extension_two(channel)
    else:
        <span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">print 'Channel %s entered an invalid option!' % </span>channel.<span class="diff-html-added" id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">json.get('name')
        channel.</span>play(media='sound:option-is-invalid')
        play_intro_menu(channel)


def stasis_start_cb(channel_obj, ev):
    """Handler for StasisStart event"""

    channel = channel_obj.get('channel')
    print "Channel %s has entered the application" % channel.json.get('name')

    channel.on_event('ChannelDtmfReceived', on_dtmf_received)
    play_intro_menu(channel)</pre> </td> 
</tr> 
</tbody> 
</table> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> 
<table class="diff-macro diff-block-target" 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> 
<tr> 
<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-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th> 
</tr> 
</thead> 
<tbody> 
<tr> 
<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"> 
<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<tbody> 
<tr> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">linenumbers</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">true</td> 
</tr> 
<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">py</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">firstline</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">114</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">def handle_extension_one(channel):
    """Handler for a channel pressing '1'

    Keyword Arguments:
    channel The channel in the IVR
    """
    <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">print 'Channel %s pressed 1' % </span>channel.<span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">json.get('name')
    channel.</span>play(media='sound:you-entered')
    channel.play(media='digits:1')
    play_intro_menu(channel)


def handle_extension_two(channel):
    """Handler for a channel pressing '2'

    Keyword Arguments:
    channel The channel in the IVR
    """
    <span class="diff-html-removed" id="removed-diff-2" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">print 'Channel %s pressed 2' % </span>channel.<span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">json.get('name')
    channel.</span>play(media='sound:you-entered')
    channel.play(media='digits:2')
    play_intro_menu(channel)</pre> </td> 
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</table> <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-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</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">title</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">channel-aa.py</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">true</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">py</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">#!/usr/bin/env python

import ari
import logging
import threading

logging.basicConfig(level=logging.ERROR)

client = ari.connect('http://localhost:8088', 'asterisk', 'asterisk')

# Note: this uses the 'extra' sounds package
sounds = ['press-1', 'or', 'press-2']

channel_timers = {}

class MenuState(object):
    """A small tracking object for the channel in the menu"""

    def __init__(self, current_sound, complete):
        self.current_sound = current_sound
        self.complete = complete


def play_intro_menu(channel):
    """Play our intro menu to the specified channel

    Since we want to interrupt the playback of the menu when the user presses
    a DTMF key, we maintain the state of the menu via the MenuState object.
    A menu completes in one of two ways:
    (1) The user hits a key
    (2) The menu finishes to completion

    In the case of (2), a timer is started for the channel. If the timer pops,
    a prompt is played back and the menu restarted.

    Keyword Arguments:
    channel  The channel in the IVR
    """

    menu_state = MenuState(0, False)

    def play_next_sound(menu_state):
        """Play the next sound, if we should

        Keyword Arguments:
        menu_state The current state of the IVR

        Returns:
        None if no playback should occur
        A playback object if a playback was started
        """
        if (menu_state.current_sound == len(sounds) or menu_state.complete):
            return None
        try:
            current_playback = channel.play(media='sound:%s' % sounds[menu_state.current_sound])
        except:
            current_playback = None
        return current_playback

    def on_playback_finished(playback, ev, menu_state):
        """Callback handler for when a playback is finished

        Keyword Arguments:
        playback   The playback object that finished
        ev         The PlaybackFinished event
        menu_state The current state of the menu
        """
        queue_up_sound(channel, menu_state)

    def queue_up_sound(channel, menu_state):
        """Start up the next sound and handle whatever happens

        Keywords Arguments:
        channel    The channel in the IVR
        menu_state The current state of the menu
        """

        def menu_timeout(channel):
            """Callback called by a timer when the menu times out"""
            print 'Channel %s stopped paying attention...' % channel.json.get('name')
            channel.play(media='sound:are-you-still-there')
            play_intro_menu(channel)

        def cancel_menu(channel, ev, current_playback, menu_state):
            """Cancel the menu, as the user did something"""
            menu_state.complete = True
            try:
                current_playback.stop()
            except:
                pass
            return

        current_playback = play_next_sound(menu_state)
        if not current_playback:
            if menu_state.current_sound == len(sounds):
                # Menu played, start a timer!
                timer = threading.Timer(10, menu_timeout, [channel])
                channel_timers[channel.id] = timer
                timer.start()
            return

        menu_state.current_sound += 1
        current_playback.on_event('PlaybackFinished', on_playback_finished,
                                  callback_args=[menu_state])

        # If the user hits a key or hangs up, cancel the menu operations
        channel.on_event('ChannelDtmfReceived', cancel_menu,
                         callback_args=[current_playback, menu_state])
        channel.on_event('StasisEnd', cancel_menu,
                         callback_args=[current_playback, menu_state])

    queue_up_sound(channel, menu_state)


def handle_extension_one(channel):
    """Handler for a channel pressing '1'

    Keyword Arguments:
    channel The channel in the IVR
    """
    channel.play(media='sound:you-entered')
    channel.play(media='digits:1')
    play_intro_menu(channel)


def handle_extension_two(channel):
    """Handler for a channel pressing '2'

    Keyword Arguments:
    channel The channel in the IVR
    """
    channel.play(media='sound:you-entered')
    channel.play(media='digits:2')
    play_intro_menu(channel)


def cancel_timeout(channel):
    """Cancel the timeout timer for the channel

    Keyword Arguments:
    channel The channel in the IVR
    """
    timer = channel_timers.get(channel.id)
    if timer:
        timer.cancel()
        del channel_timers[channel.id]

    
def on_dtmf_received(channel, ev):
    """Our main DTMF handler for a channel in the IVR

    Keyword Arguments:
    channel The channel in the IVR
    digit   The DTMF digit that was pressed
    """

    # Since they pressed something, cancel the timeout timer
    cancel_timeout(channel)
    digit = int(ev.get('digit'))

    print 'Channel %s entered %d' % (channel.json.get('name'), digit)
    if digit == 1:
        handle_extension_one(channel)
    elif digit == 2:
        handle_extension_two(channel)
    else:
        print 'Channel %s entered an invalid option!' % channel.json.get('name')
        channel.play(media='sound:option-is-invalid')
        play_intro_menu(channel)


def stasis_start_cb(channel_obj, ev):
    """Handler for StasisStart event"""

    channel = channel_obj.get('channel')
    print "Channel %s has entered the application" % channel.json.get('name')

    channel.on_event('ChannelDtmfReceived', on_dtmf_received)
    play_intro_menu(channel)


def stasis_end_cb(channel, ev):
    """Handler for StasisEnd event"""

    print "%s has left the application" % channel.json.get('name')
    cancel_timeout(channel)


client.on_channel_event('StasisStart', stasis_start_cb)
client.on_channel_event('StasisEnd', stasis_end_cb)

client.run(apps='channel-aa')

</pre> </td> 
</tr> 
</tbody> 
</table> <h3 id="ARIandChannels:HandlingDTMF-channel-aa.pyinaction" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">channel-aa.py in action</h3> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" id="added-diff-4" style="font-size: 100%; background-color: #ddfade;">The following shows the output of </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channel-aa.py</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> when a PJSIP channel presses </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">1</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" id="added-diff-5" style="font-size: 100%; background-color: #ddfade;">2</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;">8</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">, then times out. Finally they hang up.</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" id="added-diff-6" 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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<tbody> 
<tr> 
<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
Channel PJSIP/alice-00000001 entered 1
Channel PJSIP/alice-00000001 entered 2
Channel PJSIP/alice-00000001 entered 8
Channel PJSIP/alice-00000001 entered an invalid option!
Channel PJSIP/alice-00000001 stopped paying attention...
PJSIP/alice-00000001 has left the application</span>
</pre> </td> 
</tr> 
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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> <h2 id="ARIandChannels:HandlingDTMF-JavaScript(Node.js)" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">JavaScript (Node.js)</h2> <p class="diff-block-context" style="margin: 10px 0 0 0"> </p> </td> 
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