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

[Munjal Patel]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20120607/29a5bd7f/attachment-0002.html>