Hello,
I had a couple of doubts regarding the SDP
message body manipulations. Please go
through the following examples and tell me if
my understanding is correct.
Pardon me if the same questions have been
asked earlier. I'd be grateful if you could tell me
when the issue was discussed (in that case).
Case 1:
----------
Invite recd contained SDP message of the form:
v=0
o=mhandley 29739 7272939 IN IP4 126.5.4.3
c=IN IP4 135.180.130.88
m=audio 34567 RTP/AVP 0 4 12
a=sendonly
and the endpoint was willing to accept only media
of format "0". In such a case, can it break the "m="
line and reply with a SDP of the form:
v=0
o=abcd 456783 7272939 IN IP4 139.76.34.221
c=IN IP4 139.76.34.221
m=audio 36777 RTP/AVP 0
a=sendonly
m=audio 0 RTP/AVP 4
m=audio 0 RTP/AVP 12
Case 2:
----------
Invite recd contained a SDP message of the form:
v=0
o=mhandley 29739 7272939 IN IP4 126.5.4.3
c=IN IP4 135.180.130.88
a=sendonly
m=audio 34567 RTP/AVP 0 4 12
and the endpoint can recv media format 0 and 4
but can only send media format 12.
In this case, is the following response valid?
(What I basically mean to ask, is that whether a session-level
attribute in the incoming INVITE can be replicated
in the media-level attributes multiple times?)
v=0
o=abcd 456783 7272939 IN IP4 139.76.34.221
c=IN IP4 139.76.34.221
m=audio 36777 RTP/AVP 0
a=sendonly
m=audio 45321 RTP/AVP 4
a=sendonly
m=audio 0 RTP/AVP 12
Thanks in advance,
Siddharth.
=================================
Siddharth Toshniwal
Software Engineer
Hughes Software Systems, Bangalore
http://www.hssworld.com
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