[SIPForum-discussion] Need Info - UAC behavior

[Stewart Bunce]

I assume you mean your phone is sending an ACK followed by a BYE (rather than a 200 OK). This will be because the 200 OK from sipp does not contain a codec on the m= line that your phone recognises. The rtpmap line does describe a valid codec but for payload type 8 NOT the payload type 12345 that has been specfied on the m= line.
 
I this situation the phone MUST send an ACK as it has received a final response, but as it has detected an error with the media setup it then terminates the call immediately.
 
Stew

-----Original Message-----
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org]On Behalf Of Gowthaman Desingh
Sent: 21 January 2009 06:31
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Need Info - UAC behavior



Hi All,
  I would like to know the expected behavior of the UAC in the below mentioned scenario.

Setup:
        |SIP Phone | -------- |sipp| 
    I have connected a SIP phone back to back with SIPP.

1. I send an INVITE request from the SIP Phone to the sipp with the below mentioned SDP offer.
**********************************
v=0
o=SIPUA 22986 0 IN IP4 9.7.40.253
s=SIP Call
t=0 0
m=audio 19570 RTP/AVP 0 8 18 102 9 101
c=IN IP4 9.7.40.253
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:102 L16/16000
a=rtpmap:9 G722/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
**********************************

2. Accept the call from sipp by sending 200 OK.
  In the 200 OK sent by the sipp, I send the below mentioned SDP answer. The payload number mentioned in the m=line is "12345"(which is invalid). But the payload number mentioned in the attribute is valid (8 - PCMA). 
**********************************
v=0
o=user1 53655765 2353687637 IN IP4 9.7.40.50
s=-
t=0 0
a=recvonly
c=IN IP4 9.7.40.50
*m=audio 6000 RTP/AVP 12345*
c=IN IP4 9.7.40.50
*a=rtpmap:8 PCMA/8000*
a=sendonly
*********************************** 


My phone is sending 200 OK followed by BYE to terminate the call. Is that a valid behavior. 

Thanks,
Gowthaman D
  


u can reach me on my mobile @ +919886625873


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