Every time I press the pound key then any number after it the phone says invalid number without me putting in the full ext. #968 is my page code. / Overhead paging code. Is it the dial plan?
Is it the dial plan? --> 99% Yes. Something in your dial-plan thinks, that you are already "finished" with dialing after # + 1 digit. In CUCM it probably would be a pattern with "Urgent Priority" set. Maybe you have something similar in your dial-plan / PBX.
I am assuming you are working with CUCM. If you are working with something else (like CUCM Express or a 3rd party PBX) please let us know.
If you are receiving an error message after a single digit press, my first thought is that the partition associated with the paging code pattern is not in the calling search space of the originating device/line. Take a look at that.
If you are not using a Cisco call control system and aren't naming the one you have, I don't think we can be of much help here. I suggest you use the troubleshooting resources for your call-control system.
