[SR-Users] How to disable video in invite with both audio and video

[Richard Fuchs]

On 22/04/2022 10.46, [EXT] Henning Westerholt wrote:
>
> Hello,
>
> I did not look in the RFC regarding the removing the video line in 
> questions. You are probably referring to the sdp_remove_media() function.
>
> Do you expect problems when you are doing this? A quick web search 
> found a similar suggestion also e.g. for Cisco router and others.
>
The problem with simply removing a media section is that the answer 
going back to the A-side will have mismatched media sections, which is 
invalid according to the RFC.

You can remove the video media section in the offer going from A to B, 
but in the answer from B to A the media section should be restored with 
the port set to zero, indicating a rejected media section. Since the 
answer from B won't contain a section for the video, a new `m=` must be 
inserted in the SDP going back to A, matching the `m=` originally 
presented by A.

Cheers
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.kamailio.org/pipermail/sr-users/attachments/20220422/88c68c1c/attachment.htm>