Probably your are hitting defect:Symptoms: A Cisco 2921 Gateway that is running Cisco IOS Release 15.1(1)T1 isunable to register with IMS.Conditions: The symptom is observed if the P-Associated-URI of the 200 Okresponse contains any special character...

Hello! According Cisco DOCs, it is correct behavior.  You can disable it using parameter below: disableDnisStrip—By default survivability.tcl will strip of all leading zeros from the dialed number. To disable this, you can set the disableDnisStrip pa...

Hello, 1, If your invite in  +e164, please be aware what survivability.tcl striping + sign., ex: incoming: +44 123456789 , after survivability.tcl your should match  44123456789 on CVP outgoing dialpeer. Pavels

Hello Andrey! survivability.tcl  doesn't  like  translation-profile on same dialpeer. ( atleast 11.5) You can use translation-profile outgoing on CVP dialpeer. Best Regards, Pavels