[SIPForum-discussion] difference in the sdp for the calls !!

[Gonzalo Gasca]

Hi Vir, Check inline

--
Gonzalo



From: virajith <vir356 at rediffmail.com>
Date: 3 Dec 2011 06:50:30 -0000
To: "discussion at sipforum.org" <discussion at sipforum.org>
Subject: [SIPForum-discussion] difference in the sdp for the calls !!


Dear all,

I have  a query in relation to  2 different types of  sdp received in  the
INVITE from  a sip provider for  incoming calls.

Scenario 1
=========>

=======sdp  for few  calls==========

v=0
o=- 2341457 1 IN IP4 60.234.18.158
s=-
c=IN IP4 60.234.18.158
t=0 0
m=audio 30006 RTP/AVP 8 0 18 100
a=fmtp:18 annexb=no
a=fmtp:100 0-15
a=ptime:20
a=rtpmap:100 telephone-event/8000

===============================


Scenario 2
=========>

===========sdp for other calls===========

v=0
o=default 1322426685 1322426685 IN IP4 60.234.18.158
s=-
c=IN IP4 60.234.18.158
t=0 0
m=audio 30002 RTP/AVP 18 106 4 8 0
a=sendrecv
a=rtpmap:106 telephone-event/8000
a=fmtp:106 0-15
a=maxptime:90

============================================


Now the questions I have is the following...





1>what are the codecs  and the dtmf  methods being advertised in scenario 1
?
[Gonzalo]
m=audio 30006 RTP/AVP 8 0 18 100
a=fmtp:18 annexb=no
a=fmtp:100 0-15
a=ptime:20
a=rtpmap:100 telephone-event/8000

Audio call
8 0 18 100
18 seems G729
100 DTMF event.

2>what are the codecs  and the dtmf  methods being advertised in scenario 2
?
[Gonzalo]

m=audio 30002 RTP/AVP 18 106 4 8 0
a=sendrecv
a=rtpmap:106 telephone-event/8000
a=fmtp:106 0-15
a=maxptime:90

Audio call
18 106 4 8 0
106 DTMF event.

3>what is a=sendrecv ?
[Gonzalo]
Open Media path both ways,

4>also anything else that you can point out  that is different in the    2
sdps   ?

[Gonzalo]Are those 2 different calls?

I see lack of fmtp mapping in both, can you maybe describe what's the
problem you are having and attach all the logs in the call ( Im interested
to see 200 OK/ACK with SDP)


Thanks,
Vir





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