We are using CUCM 18.104.22.16800-10 with a Pub and a Sub . This is a centralized Call processing model with no remote sites. Lately, Users are complaing of Call Disconnect issues with message "Temp Fail" on phone.
We know "Temp Fail" is a result of network issue.
Does it mean there can be no issue from the Carrier?
We have a SIP trunk to a SIP Proxy server and a SIP trunk to the Carrier.
We can say that the SIP proxy server acts as an IPIPGateway witha SIP Trunk to CUCM on one interface and a SIP Trunk to Carrier on the other interface.
As per the CUCM traces, call disconnect came from CUCM.
Can anyone please let me know more detail about how to proceed with T/S this issue.
Thanks a lot.