Hi,
I forgot to mention a couple of things:
1. One can't send a response again for a response received.So, A can't
respond with a 3xx response.
2. The response from B should contain exactly same number of media lines as
sent by A in the INVITE request. So,the response sent by B is anyway not
correct.
This is given in "draft-rosenberg-mmusic-sdp-offer-answer-00.txt"
Link for this is..
http://www.ietf.org/internet-drafts/draft-rosenberg-mmusic-sdp-offer-answer
-00.txt
regards,
Awanish.
[EMAIL PROTECTED] on 11/28/2001 12:35:59 PM
To: [EMAIL PROTECTED]
cc: (bcc: Awanish Gautam/HSSBLR)
Subject: [Sip-implementors] SDP problem
Hi All,
I am working on the development of SIP user agent. I have got a problem in
SDP negotiation. My problem is as follows.
Suppose user agent A sends an INVITE request to user agent B with SDP as
follows
v=0
o=A 1907016736 1907016736 IN IP4 151.209.33.171
s=Calling User
c=IN IP4 PGS-451
t=0 0
m=audio 2074 RTP/AVP 3 5
a=rtpmap:3 GSM/4000
a=rtpmap:5 GSM/8000
Then user agent B sends OK response along with the following SDP
v=0
o=B 1907015736 1907015736 IN IP4 151.209.33.190
s=Answering the call
c=IN IP4 pgs-477
t=0 0
m=audio 0 RTP/AVP 3
m=audio 5 RTP/AVP 5
Now since it is understood that user agent B does not support payload of
type 3 what should be the response of A.
is it user agent A has to send a ACK to the user agent B or send a 3xx
response? please give me a clarification.
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