A company I do work for started experiencing a problem today, they cannot make outbound or receive inbound calls. When calling out the call terminates with "Seize Failed" message. When calling in the call never connects and you are told "The number you have dialed is not in service." the system has been working for a few years now without issue and the problem just started today with no changes. I have already contacted the VoIP line provider and they stated they can see the call come through but it terminates due to a second connection attempt from the PBX. I pulled these logs from when I attempted to call out to my cell. 21-Jul-2017 15:40:55.058 Leg L:6.1[Extn:1122] is terminated: Cause: BYE from PBX 21-Jul-2017 15:40:55.008 Leg L:6.2[Line:10006>>[MYCELL]] is terminated: Cause: 403 Forbidden/INVITE from 172.18.255.1:56772 21-Jul-2017 15:40:55.008 [CM503020]: Call(C:6): Normal call termination. Call originator: Extn:1122. Reason: Forbidden L:6.1[Extn:1122] failed to reach Line:10006>>[MYCELL], reason Forbidden Event ID in server event log is, Warning 12294 I'll admit my knowledge is limited, any help is appreciated.