[SIPForum-discussion] 183 Session Progress with SDP missing info

[Lindström Tomi]

You are right there should be a-line for that g.729 and Cisco is working Like it supposed.

Br Tomi
________________________________
From: Munjal Patel
Sent: 11.06.2012 14:34
To: discussion at sipforum.org
Subject: [SIPForum-discussion] 183 Session Progress with SDP missing info

hi everyone i'm new to SIP and needing some help with a issue i'm having, any help would be appreciated

A= Cisco 2811 UAC
B= Carrier end point

During call setup carrier is responding back with 183 Session Progress SDP but with missing “a”-Line, here is the snips from the PCAP:


Invite- A to B (SIP/SDP)

SDP>
(M): audio 47640 RTP/AVP 18 101
(A): rtpmap:18 g729/8000/1
(A): rtpmap:101 telephone-event/8000/1
(A): ptime:20

100 Trying- B to A (SIP)

183 Session Progress- B to A (SIP/SDP)

SDP>
(M): audio 60050 RTP/AVP 18 101
(A): rtpmap:101 telephone-event/8000/1
(A): ptime:20

Cancel- A to B (SIP)


My question, is it normal for Cisco 2811 to send a cancel or can it be configured to try to renegotiate media with the carrier.


Thank You,

Munjal Patel
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