Connect CUCM to ITSP Sip trunk Directly

[nassir]

Hi all,

I need to connect my CUCM to ITSP Sip trunk directly. Sip trunk created, I have Outgoing calls without any problem but the problem is with incoming calls. 

I found these errors in RTMT:

//SIP/Stack/Error/0x0/httpish_msg_free: Freeing NULL pointer!

//SIP/Stack/Info/0x0xf0e0b1c8/sentErrResDisconnecting: Sent an 3456XX Error Response

and the translation pattern already set.

[Jim duPuis]

Have you checked you SIP Min-SE Value in UCM? Default value is 1800, the invite has 90 which could explain the 422 Session Timer too small. This post might be helpful: https://community.cisco.com/t5/ip-telephony-and-phones/cucm-timer-problem-422-session-timer-too-small/td-p/1884527