Hi experts,
We are working on VoIP IOT between two vendors and we have some discussion
about the interpretation of the RFC3264 so I wonder if you can help us out.
The scenario is a call hold/resume. The UAC is offering a SDP with the media
direction set at media-level:
v=0
...
m=audio 37000 RTP/AVP 8
a=inactive
a=rtpmap:8 PCMA/8000
....
The other end is answering the SDP with the media direction set at
session-level:
v=0
...
a=inactive
m=audio 28038 RTP/AVP 8
a=rtpmap:8 PCMA/8000
...
The question is: Is this a correct answer for that offer?. In case of SDP with
only one "m" line, Is it mandatory to set the media direction attribute at the
same level as the offer?
According to the RFC3264:
"If a stream is offered as sendonly, the corresponding stream MUST be marked as
recvonly or inactive in the answer. If a media stream is listed as recvonly in
the offer, the answer MUST be marked as sendonly or inactive in the answer."
But RFC3264 also states:
"We refer to a stream as being marked with a certain direction if a direction
attribute was present as either a media stream attribute or a session attribute"
Thanks in advance for your help.
Best Regards //Fernando
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