Delay for inbound call using SIP trunk

[Mapletree Network]

I have an issue here. When I pick up the call from IP Phone, I hear no sound and the caller still hear the ringing tone for the next 7-10 seconds before the call establish and we start the conversation. 

Below is the call setup: 

Call from outside --> Sip trunk --> Voice Gateway (CUBE) --> SIP trunk --> CUCM --> IP Phone (SIP)

Outbound call do not have this issue.  

Any idea hot to troubleshoot?

[Maren Mahoney]

Can you provide a 'debug ccsip messages' from the CUBE, and a trace of the Cisco CallManager service? That should tell us where the breakdown in the relay of the OK message is.

Maren

[Phil.Males]

Did you fix your problem? I am experiencing the same delay

Thanks,

Phil