Dear All,
I am a bit confused with description of media nagotiating by SIP.
I refer to rfc2543bis-2.
* The first case *
Example 16.3 of the spec.:
SDP in INIVTE contains (from Bell):
m=audio 3456 RTP/AVP 0 3 4 5
200 response contains (from Watson):
m=audio 5004 RTP/AVP 0 3
and note: "(...)Watson�s list of codecs may or may not be a subset
of the one offered by Bell"
My questions:
1. Would Watson reply with e.g.:
m=audio 5004 RTP/AVP 7 8
2. How would it be possible to decode on one UDP port (5004) more
then one media stream simultaneosly ( i mean 0 and 3 on 5004) ?
* The second case *
B.1 of the spec:
SDP in INIVTE contains:
m=audio 49170 RTP/AVP 0
200 response contains:
m=audio 57920 RTP/AVP 0 1
Question: Why UAS added codec with payload 1 ?
Generally: If 200 response contains codecs that are not understood
by caller, session probably fail because ACK cannot change session
description. Is it true ? Correct me, if not.
Regards, Piotr
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