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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Thanks Josh!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">I was already suspecting something like this.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#006ED2;background:white">FLORIAN FLOIMAIR</span></b><b><span lang="EN-US" style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#172B4D;background:white"><br>
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</span></b><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">Von: </span></b><span style="font-size:12.0pt;color:black">asterisk-users <asterisk-users-bounces@lists.digium.com> im Auftrag von "Joshua C. Colp" <jcolp@sangoma.com><br>
<b>Antworten an: </b>Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users@lists.digium.com><br>
<b>Datum: </b>Mittwoch, 13. Oktober 2021 um 15:12<br>
<b>An: </b>Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users@lists.digium.com><br>
<b>Betreff: </b>[External] Re: [asterisk-users] SIP INFO messages with Content-Type: application/media_control+xml<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p style="background:#FFEB9C;border:none;padding:0cm"><b><span style="font-size:10.0pt;color:black">CAUTION:</span></b><span style="color:black">
</span><span style="font-size:10.0pt;color:black">This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.</span><o:p></o:p></p>
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<p class="MsoNormal">On Wed, Oct 13, 2021 at 10:05 AM Floimair Florian <<a href="mailto:f.floimair@commend.com">f.floimair@commend.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Hi all!</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">We have a WebRTC user-agent (using sip.js) that is giving me headache.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">When a different user-agent calls this user-agent, we frequently see Asterisk generating SIP INFO messages with</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white">Content-Type: application/media_control+xml</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white">Content-Length: 178</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"><?xml version="1.0" encoding="utf-8" ?></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"><media_control></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"> <vc_primitive></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"> <to_encoder></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"> <picture_fast_update/></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"> </to_encoder></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"></vc_primitive></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas;color:#333333;background:white"></media_control></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">In the payload, that is sent from Asterisk to the caller UA (the WebRTC client is the callee).</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">While this does not do any harm usually, I have no clue yet what causes Asterisk to generate these INFO messages.<br>
I do know what they are for (<a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc5168&data=04%7C01%7Cf.floimair%40commend.com%7C348e1e7064704e31218e08d98e4b21d5%7C13b1ddb756454e7fbe663171548559da%7C0%7C0%7C637697275616090301%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=aaQE409aZSFLW0IKu3zsz187t5MNwDd7q%2FXkZd7mbck%3D&reserved=0" target="_blank">https://datatracker.ietf.org/doc/html/rfc5168</a>),
but not why Asterisk is generating those or what might be the trigger.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Anyone have any hint?</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">They will occur as a result of a video client requesting a full frame, and there's a few places in Asterisk where it will generate one in certain scenarios. Generally it comes from another client though. It can be received either using
an incoming INFO request, or via RTCP through a PLI or FIR. If using PJSIP then the INFO request is only used for the H.264 codec if the WebRTC option is not enabled.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"tahoma",sans-serif;color:#073763">Joshua C. Colp</span><span style="font-family:"tahoma",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"tahoma",sans-serif;color:#073763">Asterisk Technical Lead</span><span style="font-family:"tahoma",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"tahoma",sans-serif;color:#073763">Sangoma Technologies</span><span style="font-family:"tahoma",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"tahoma",sans-serif;color:#073763">Check us out at
<a href="https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.sangoma.com%2F&data=04%7C01%7Cf.floimair%40commend.com%7C348e1e7064704e31218e08d98e4b21d5%7C13b1ddb756454e7fbe663171548559da%7C0%7C0%7C637697275616100293%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=BbHjQrV3t1OAspzrXLr1YcQ7k6eJCgUUSVBB40Q4Ai0%3D&reserved=0" target="_blank">
www.sangoma.com</a> and <a href="https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.asterisk.org%2F&data=04%7C01%7Cf.floimair%40commend.com%7C348e1e7064704e31218e08d98e4b21d5%7C13b1ddb756454e7fbe663171548559da%7C0%7C0%7C637697275616100293%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=6AM%2BZg%2FL9A04sXw7ntgTjZNzxy4iZ6UJlWRL9bTxyhk%3D&reserved=0" target="_blank">
www.asterisk.org</a></span><span style="font-family:"tahoma",sans-serif"><o:p></o:p></span></p>
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