[cisco-voip] SIP 400 Bad request

[Mark Holloway]

Two things catch my attention.

1) The Request URI and the To header are different.  The To header is prepended with two extra digits and the host port is 5061.  The Request URI does not contain the digits 02 and the host port is 5060 as opposed to 5061.  

2) The format of the SDP looks odd.  I'm not suggesting it's wrong, but that is not how I typically see the SDP formatted.  I recently experienced an issue where an IAD was rejecting media establishment due to an unsupported SDP parameter being sent by a Toshiba CIX using a SIP Trunk.  It is possible that UCM does not like something in the SDP.

Is the SBC managed by you or your provider?  Do you have the ability to test your CCM SIP Trunk with CUBE? 

If I were you I would focus on the Request URI vs. To header first and see if that clear up your problem. 

On Mar 9, 2010, at 5:55 AM, Jefflin Choi wrote:

> Hi,
> 
> I'm trying to troubleshoot and incoming call from SBC to CCM SIP trunk. Outgoing call to SBC from IP Phone works fine. using G711ulaw codec without security.
> 
> Topology:
> SIP server ------------SBC(SIP)---------CCM7-----IP Phone(SCCP)
> 
> Problem
> I'm getting 400 Bad request from Sniffer trace. I checked my Partition and CSS including transformation mask and saw no problem.
> We are using UDP for sip protocol. 
> 
> Q.
> Any idea why CCM7 is sending 400 Bad request? There seem to be a reason CCM7 is rejecting the SIP invite however i could not find it.
> 
> Attached is the captured sniffer trace on CCM.
> 
> Thanks in advance for the help.
> 
> regards,
> Jeff
> 
> 
> 
> 
> 
> 
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