CUCM 9/SIP incoming calls failing

[the-lebowski]

Just recently incoming calls started to fail and I see this in the logs:

1795163: Jul  6 02:43:13.119: //986339/DF74C88A8723/SIP/Msg/ccsipDisplayMsg:

Received:

SIP/2.0 503 Service Unavailable

Via: SIP/2.0/UDP 10.129.11.2:5060;branch=z9hG4bK2BCD18BD

From: sip:0014109809147@195.162.200.33;tag=330A21FC-891

To: <sip:32590430@10.129.11.20>;tag=998350446

Date: Sat, 06 Jul 2013 00:43:13 GMT

Call-ID: DF787212-E50B11E2-872BE487-4584BD02@10.129.11.2

CSeq: 101 INVITE

Allow-Events: presence

Warning: 399 cucm-01 "Unable to find a device handler for the request received on port 58741 from 10.129.11.2"

10.129.11.2 is the 2911 where the SIP trunk terminates and these logs are coming from. Nothing has changed and not sure what the issue is. 

Can someone help me out?

[the-lebowski]

I was able to resolve this by updating the SIP trunk in CUCM to use 10.129.11.2  as the destination instead of the public IP of the SIP trun.  Although I am not sure what changed?  I have two CUCM servers and not sure if they were out of sync?  After I changed the IP on one of them I checked the other and it had the same IP.  Unsure whether or not it always did or it synced.

Hopefully this helps someone in the future.