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CUCM 7.1.3 sends its IP in 200 OK response for SIP register message

With Cisco CCM, in all responses(200 OK) for SIP register methods, the CCM sends its own IP address in contact header instead of Client IP address.

I have tried with CCM 6.0, 7.1.3(different patches) and with 8.0.3. In all these cases it sends the actual client IP address in the 200 Ok response message contact header.

Anybody has idea which configuration in CCM which lead to this issue? This issue has run into multiple other gateway and other issues for me. Any help on this regard is highly appreciated.

I cant play with the CCM which sends this contact wrongly. but i tried to reproduce the same with all other versions and was unsuccessful. In SIP profile settings i tried playing with options to reproduce this issue in other servers.

I doubt some configuration in cucm is what is causing this, but not ble to identify which config !

Any CCM expert's help is much appreciated!

If it is not a configuration issue, can somebody tell is there a known issue in this release7.1.3.33030-1 and please provide some bug detals and fixed in version details...