Calling party SIP URI's domain portion is changed to CUCM IP - How to avoid it

[majeed002]

When a call is received especially through SIP trunk, calling party SIP URI's domain portion is getting changed to @cucmip.  This blocks the user from returning the call using the recent calls. 

How to disable CUCM from changing the domain portion of the calling party identification.  Other end of the SIP trunk is a expressway and the exp call history shows that the source has the full sip URI correctly.  It seems CUCM is changing the domain portion.  Am I missing any configuration.

[Aseem Anand]

Hi,

What is the complete call flow? Incoming call to CUCM from expressway? If yes then where is it suppose to forward to? Have you configured any SIP route pattern on CUCM?

Refer to the link below:

http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-1/Cisco-Expressway-SIP-Trunk-to-Unified-CM-Deployment-Guide-CUCM-8-9-and-X8-1.pdf

Aseem