I dear im facing a big issue here.I have a CCME 7.1 running IOS c2900-universalk9-mz.SPA.150-1.M6.bin. This CCME is connected to PSTN using BRI interfaces for outbound and inbound public phone calls. The company also needs to make some calls to a SIP...

I have a CUCM 7.1.3 integrated with a Alcatel OXO PBX and when a try to place a call from cisco IP-Phones registered on CUCM to phones on PBX, I have no ringback,but  when a place a call from cisco IP-Phones registered on CUCM to PSTN using PBX as it...