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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/~gjoseph?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_56b2a47747d2721d6dcf26979b4b605a" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<td style="padding: 0px; border-collapse: collapse"><span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">On this page</span></td>
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<h1 id="ConferenceParticipantMessaging-Overview" 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;">Overview</span> </h1>
<p style="margin: 10px 0 0 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">Since Asterisk 13.22.0 and 15.5.0, in-dialog SIP MESSAGE support in the chan_pjsip channel driver is enhanced and conference bridges added support for relaying messages. The chan_pjsip channel driver now allows exchanging enhanced messages with Asterisk's core that have additional metadata indicating the sender and the mime-type of the message contents. The conference bridges now allow relaying text and enhanced messages from one participant to all other participants.</span> </p>
<h1 id="ConferenceParticipantMessaging-Howitworks" 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" style="background-color: #d6f0ff;">How it works</span> </h1>
<p style="margin: 10px 0 0 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">It sounds simple enough but this required some restructuring of the bridging core to preserve the original sender's information and add support for text content types other than text/plain.</span> </p>
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<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">The participant creates a SIP MESSAGE request with a specific content type, message body, and optionally a "From" display name.</span> </p> </li>
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">The participant then sends that message in-dialog to the conference bridge.</span> </p> </li>
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">Normally when a channel driver receives a text message, it passes only the text body to the bridging core, but this causes the sender and content type to be lost. Now, when the chan_pjsip res_pjsip_messaging module receives an in-dialog SIP MESSAGE, it captures the From header's display name, the content type, and the body to pass on to the bridging core. Other than the From display name, no other sender information is exposed.</span> </p> </li>
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">When bridge_softmix (the bridging module used by ConfBridge) sees the message, it relays it to all other bridge participants.</span> </p> </li>
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">Any other participants connected via chan_pjsip will get the From display name, content-type, and body. Those not connected via chan_pjsip will get whatever the channel driver supports.</span> </p> </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-changed" id="changed-diff-1" style="background-color: #d6f0ff;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/images/icons/macrobrowser/dropdown/toc.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Table of Contents</span></th>
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<h1 id="ConferenceParticipantMessaging-UsingEnhancedMessaging" 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-2" style="background-color: #d6f0ff;">Using </span> </h1>
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<h1 id="ConferenceParticipantMessaging-UsingEnhancedMessaging" 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" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">Enhanced Messaging</span> </h1>
<p style="margin: 10px 0 0 0"> <span class="diff-html-changed" id="changed-diff-4" style="background-color: #d6f0ff;">While </span> </p>
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<p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">Enhanced Messaging </span><span class="diff-html-changed" id="changed-diff-5" style="background-color: #d6f0ff;">is interesting for Asterisk 13, it is very interesting for Asterisk 15 and later. Imagine a video conference using Asterisk 15's Selective Forwarding Unit (SFU) capability in ConfBridge. Enhanced </span> </p>
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<p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">Messaging </span><span class="diff-html-changed" id="changed-diff-6" style="background-color: #d6f0ff;">allows the conference participants to chat while participating in the conference. </span><a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-7" style="background-color: #d6f0ff;">CyberMegaPhone</span></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-8" style="background-color: #d6f0ff;">is an example for such a video conference application.</span> </p>
<h2 id="ConferenceParticipantMessaging-ConfiguringAsterisk" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">Configuring Asterisk</span> </h2>
<p style="margin: 10px 0 0 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">There is no additional configuration needed. Enhanced </span> </p>
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<p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">Messaging </span><span class="diff-html-changed" id="changed-diff-9" style="background-color: #d6f0ff;">is built-in and always available.</span> </p>
<h2 id="ConferenceParticipantMessaging-Inthebrowser..." style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">In the browser...</span> </h2>
<p style="margin: 10px 0 0 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">How you design the user interface portion is totally up to you but here is a sample of how </span><a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-10" style="background-color: #d6f0ff;">CyberMegaPhone</span></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-11" style="background-color: #d6f0ff;">could be extended to send a message using </span><a href="http://jssip.net" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" style="background-color: #d6f0ff;">JsSIP</span></a><span class="diff-html-changed" style="background-color: #d6f0ff;">. In this example, this._ua is a JsSIP.UA instance and this.rtc is a JsSIP.RTCSession instance. Refer to the </span><a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-12" style="background-color: #d6f0ff;">CyberMegaPhone</span></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-13" style="background-color: #d6f0ff;">code to see where this might fit.</span> </p>
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<span class="diff-html-changed" style="background-color: #d6f0ff;">CyberMegaPhone.prototype.sendMessage = function (string_msg, options = {} ) {
/*
* You could allow the user to set a nickname
* for themselves which JsSIP can send as the
* display name in the SIP From header. In the code
* that receives the message, you can then grab the
* display name from the packet.
*/
if (options.from) {
from = options.from;
this._ua.set("display_name", from);
}
/*
* The message payload can be any UTF-8 string but you are not
* limited to plain text. The Content-Type must be set to one
* of the text/ or application/ types but as long as the sender
* and receiver agree on the payload format, it can contain
* whatever you want. In this example, we are going to send
* a JSON blob.
*
* If you do not want to alter the display name on the actual
* SIP MESSAGE From header, you could include the user's
* nickname in the payload.
*/
let msg = {
'From': from,
'Body': string_msg
};
let body = JSON.stringify(msg);
let extraHeaders = [ 'Content-Type: application/x-myphone-confbridge-chat+json' ];
this.rtc.sendRequest(JsSIP.C.MESSAGE, {
extraHeaders,
body: body,
eventHandlers: options.handlers
});
};
/*
* Now here is how you would call sendMessage
*/
phone.sendMessage("Hello!", {from: "My Name", handlers: {
onSuccessResponse(response) {
// You may want to show an indicator that the message was sent successfully.
console.log("Message Sent: " + response);
},
onErrorResponse(response) {
console.log("Message ERROR: " + response);
},
onTransportError() {
console.log("Could not send message");
},
onRequestTimeout() {
console.log("Timeout sending message");
},
onDialogError() {
console.log("Dialog Error sending message");
},
}});</span>
</pre> </td>
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<p style="margin: 10px 0 0 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">Congratulations, you have just sent a text message! Assuming the user called a conference bridge in the first place, all the other participants should receive it. The code to retrieve the message is even simpler than the code to send it. Once again, in this CyberMegaPhone example, this._ua is the JsSIP.UA instance.</span> </p>
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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-changed" style="background-color: #d6f0ff;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/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-changed" style="background-color: #d6f0ff;"> this._ua.on('newMessage', function (data) {
/* We do not care about messages we send. */
if (data.originator === 'local') {
return;
}
/* Grab the Content-Type header from the packet */
let ct = data.request.headers['Content-Type'][0].raw;
/* Make sure the message is one we care about */
if (ct === 'application/x-myphone-confbridge-chat+json') {
/* Parse the body back into an object */
let msg = JSON.parse(data.request.body);
/* Tell the UI that we got a chat message */
that.raise('messageReceived', msg);
}
});</span>
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