[cisco-voip] 7940 with SIP firmware and CCM 4.0 SIP trunk

[Jozef Janitor]

Hi, 

I have a weird issue with calling from the Cisco Call Manager 4.0 over a SIP
trunk to a Cisco 7040 with SIP firmware. 
Weird is that I can create a call if I dial a Call Manager extension from
that SIP 7940 and it works without problems, 
but if I dial from a Call Manager the extension of the SIP 7940 then the
Call Manager sends out an INVITE, then accepts the RINGING, but then after a
call is accepted on a 7940, CCM just ignores the "SIP/2.0 200 OK" messages
generated by the 7940. 
If I replace the Cisco SIP 7940 with some SIP softphone then it works in
both ways. 

I attached a dump of SIP messages between a 3rd party SIP server and Call
Manager. 
The Cisco 7940 with a SIP firmware is registered to a 3rd party SIP Server. 
7940 is running on P0S3-08-2-00. 

Any ideas? 
BTW: If I dial that SIP phone from a Cisco 3745 voice gateway then it works.


Thank you.

 

All the best,

   Jozef Janitor

 

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