I have a cluster of three 7.1.3 CUCM. I have created a SIP trunk to service provider. I am able to make and receive calls. The issue I am facing is that the call gets disconnected every 15 mins.After seeing the capture I see that after 15 mins CUCM doesnot respond to the update messages and after 10th unsucessful message the Service provider sends BYE message and the call disconnects. I am not sure why is our CUCM not responding to UPDATE messages from Service Provider SIP server.
Please help on this.