SIP - Registration failure - Outgoing OK but Incoming Fails.

[sethainsley]

Hi folks,

Having a little issue here.  My outgoing calls are working fine, but incoming calls are not successful.  Call flow:

ITSP --> SIP trunk --> 2821 gateway --> CUCM --> IP Phone

There was a recent change in the registration IP but it was working both directions after the change (tested it) and now the next day it is not working again.  I did write the config after the change and I verified there was no reload or anything, and the changes are still in the config.

I have attached my sanitized config and a set of ccsip all debugs from a test call.  please let me know if anything else required.

Thank you!

[Nadeem Ahmed]

I don't INVITE is coming in to the gateway, can you please enable the below debugs

Debug voice ccapi inout along with debug ccsip all

Br,
Nadeem

[Deepak Mehta]

After looking at other similar threads , it could be an issue with provider end timer.

You can try below command  under sip-ua configuration section

registrar ipv4: PROVIDER_IP expires 3600 refresh-ratio 50

I would also say involve your provider to confirm if they are sending calls to correct SIP UA ip address and what error message they are seeing for if they see calls going out from their end.Thanks