[SR-Users] Multi-homed Kamailio Modifies ACK

[SamyGo]

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 at 192.168.1.106>;tag=as370915fc
  old_to:   <sip:+14444812211 at sip.iamip.com:5041>;tag=9FEC572E-100F
  new_from: "Test Phone" <sip:+14432232221 at 192.168.1.106>;tag=as370915fc
  new_to:   <sip:+14444812211 at 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.
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