We have started having an odd issue with our UCM 6510 PRI trunk.
We have some numbers that go to an IVR and some numbers that go to Ring Groups. Starting today I believe, anyone calling in on one of the direct to ring group numbers will get get a message “Your call could not be completed…” or a busy signal if the call is not picked up in first five seconds. If the call is answered within the first five seconds there is no issue at all. If the call goes through the IVR and then to that same ring group, there is no issue at all either.
I contacted our carrier and they indicated that they believe it is something in the PBX (though I am quite sure the call not completed message is generated by their equipment).
I can take the inbound route for the direct number and change it from Ring Group to extension, and everything works fine as well. It is only if it directs to ring group that we have the issue.
I tried updating to the 17.16 firmware to see if that had any impact and it did not.
Another oddity, though this has always happened, if someone dials into a ring group, they do no hear rings on the caller side. The phones in the ring group ring, but nothing for the caller. I have tried turning on ring back, turning on hold tones, etc and they hear nothing. If I set that same inbound route to an extension, it rings fine for the caller.
I have tried everything I can think of to try, so any help would be appreciated. Right now I have just directed everything to run through the IVR, but this is not the best option for us.