I have a route group with 2 members, the first is a SIP trunk and the second one is a PRI line. The problem is, when a call is routed through the SIP trunk and for some reason the SIP gateway replies with "486 busy here" or "503 service unavailable",...

We have implemented extension mobility for a UCM installation version 7.1(5), and I've noticed that when a user (user A) is logged out and another user (user B)  calls his extension, B receives a busy tone. Is there any way to let A know about the mi...

I have the following setup:(caller) ISDN PBX ------ cisco 5400 ios 12.4(1c) ------ SIP SBC (callee)if a call is being made originating from the PBX, towards the SBC end, and for some reason the SBC replies to the 5400 with "503 unspecified/service un...