I am using CUCM version 12 and ISR4321 as a voice gateway. There is a E1 connection as well as SIP and FXO connection. Everything is running fine but if I call to a switched off mobile phone from ip phones it hears ringback tone for a while for both E1 and SIP. So it is quite annoying. Can anybody help me regarding this
Debug the call and see what you get back from your telco for that call, if the telco doesn't provide a message that the device is not available, you would need to discuss this with them.
You depend on what you get back from the telco.
Thanks for your reply. But I am new at voice. Could you please suggest the command for debug. And I dont think it's a telco problem because in previous system it was ok with CUCM 7 and voice gateway 2900 series.
We just migrate to new system and the problem is happening.