Incoming calls to cme 10.5 SIP phones causes one way voice

[Pal Johansen]

Hi

I have a CME 10.5 with Cisco SIP  7841 phones. This CME also have PABX E1 ISDN , and Cisco SCCP phone 7941.

Calls to PABX ISDN and SCCP phones are ok, but when calling SIP phones CME reports outgoing interface ip address as media address, instead of SIP binding interface in SIP ok message to Callmanager.

SIP media and signalling binding is done to 10.225.69.30, while outgoing interface ip is 10.225.60.15.

Any call to SIP phones and i see that RTP stream is going from remote VG to outgoing interface ip is 10.225.60.15 instead of  10.225.69.30

Anyone have an idea what can be causing this?

I have attached a call flow diagram,

[lorenz84gDD]

show run would help understand what is your actual config on the CME.

[Pal Johansen]

Thanks, involved Cisco TAC and apparently there is a bug in the only IOS (15.4.3.M) supporting these phones causing it to use gateway ip address instead of loopback defined for SIP RTP binding.

Still troubleshooting for a workaround, without any success.