Content Type application/media_control+xml support in 3CX

[JakeS]

Hey,

I have a host of polycom phones on my network who are sending video fast updates via SIP INFO. The response from my 3CX server is a 415 Media Type Unsupported. If I use sipp and change the content type to application/csta+xml the video fast update goes through properly however these phones don't allow me to configure that specific use case.

Is there a way to enable Content Type: application/media_control+xml for sip info messages in 3CX?

Thanks,
Jacob

 

[cobaltit]

No

 

[JohnS_3CX]

Hi Jake,

The phones are the ones sending this, so the PBX has nothing you can control to change the type of message.

Was there a specific goal you had in mind here?

 

[JakeS]

The polycom phones supports only AVP not AVPF so no nack, no pli. The only way it can request a key frame is using out of band signalling. The device itself uses spec RFC 5168 - XML Schema for Media Control. That being said when the Content-Type is media_control+xml the sip info message doesn't go through and instead gives a 415 and asks for application/csta+xml. I enabled csta on the phone itself however it doesn't use it to send the video fast updates.

In a perfect world 3CX would just forward my SIP INFO message to me enabling me to send a keyframe back.

The spec is located at:
https://tools.ietf.org/html/rfc5168

I just want to add the accepted content type to 3CX