[asterisk-users] SIP INFO messages with Content-Type: application/media_control+xml

[Floimair Florian]

Hi all!

We have a WebRTC user-agent (using sip.js) that is giving me headache.

When a different user-agent calls this user-agent, we frequently see Asterisk generating SIP INFO messages with

Content-Type: application/media_control+xml
Content-Length: 178

<?xml version="1.0" encoding="utf-8" ?>
<media_control>
  <vc_primitive>
   <to_encoder>
    <picture_fast_update/>
  </to_encoder>
</vc_primitive>
</media_control>

In the payload, that is sent from Asterisk to the caller UA (the WebRTC client is the callee).

While this does not do any harm usually, I have no clue yet what causes Asterisk to generate these INFO messages.
I do know what they are for (https://datatracker.ietf.org/doc/html/rfc5168), but not why Asterisk is generating those or what might be the trigger.

Anyone have any hint?

Thanks and best regards


FLORIAN FLOIMAIR
Symphony Cloud Services (1568)

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