On 9/15/18 5:32 AM, Qter wrote:
Dear Experts,
I see that one device is sending re-INVITE message with such SDP
parameters:
v=0
o=- 1092631119 2 IN IP4 10.10.10.100
s=-
c=IN IP4 10.10.10.100
t=0 0
m=image 0 udptl t38
m=audio 29044 RTP/AVP 8
a=rtpmap:8 PCMA/8000
a=silenceSupp:off - - - -
The question is if m=image 0 udptl t38 is correct (port number equal 0)?
Is it according to some RFC?
There is nothing wrong with such an offer. An m= line with a zero port
number is inoperable for this round of offer/answer, because the answer
must also have a zero port number. It can serve as a place-holder where
the offerer has plans to use it in a future offer, or hopes you will use
it in a future offer. I suppose it might be intended as an indicator
that the offerer is *capable* of supporting that, but AFAIK there is no
such standardized meaning.
Thanks,
Paul
BR
Bart
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