I was dispatched to a nursing home yesterday with a report that the receptionist phone was not working due to a bad jack/wiring. Upon arrival, I find that there is nothing wrong with the wiring. The phone works fine, but it appears to have some kind of restriction or feature enabled that is preventing it from making any calls.

The feature keys for line 1 and line 2 are lit up red. They are idle on all other extensions, and all other extensions can use line 1 and line 2 just fine without any issue. I have worked on DSX, SL1100 and SL2100 but never a SV9100. I told them they would have to contact whomever installed/programmed the system, but they have no clue who that would be. There is no identifying information on the system itself nor any documentation that anyone can find that may identify who installed it.

Does this sound like a simple feature that was enabled by mistake?