Is the UAC in this case a 2543 endpoint by chance? Can you send a complete SIP trace of the entire setup?

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Alex Balashov | Principal | Evariste Systems LLC
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Sent from my BlackBerry.

From: SamyGo

Sent: Tuesday, May 12, 2015 11:46

To: SIP Router - Kamailio (OpenSER) and SIP Express Router (SER) - Users Mailing List

Reply To: Kamailio (SER) - Users Mailing List

Subject: [SR-Users] Multi-homed Kamailio Modifies ACK

Hi all,

I'm having a scenario where I'm sending call to CISCO IAD2431. The call establishes with 200OK from CISCO and Kamailio sends back modified ACK. Cisco at this points gives out an error and sends 200OK again, Kamailio replies with ACK, and this cycle goes on until the call drops.

Here is the error from CISCO:

Failed FROM/TO Request check

old_from: "Test Phone" <sip:+14432232221@192.168.1.106>;tag=as370915fc

old_to: <sip:+14444812211@sip.iamip.com:5041>;tag=9FEC572E-100F

new_from: "Test Phone" <sip:+14432232221@192.168.1.106>;tag=as370915fc

new_to: <sip:+14444812211@192.168.1.244:5041>;tag=9FE

I've

#auto_aliases=no

and,

listen=udp:44.33.22.11:5041

listen=udp:192.168.1.244:5041

Kamailio sends INVITE through the Public IP to the CISCO gw, but decides to change the ACK header.

Any advise please.

Best Regards,

Sammy.