said by zyli :No my phone is modem based, so simmilar to VOIP
Is the modem in your suite/apartment, with your phone plugged directly into it; or is it wired into the building wiring (either in the main phone room, or within your apartment) perhaps for an enter-phone/door buzzer type devices?
Sounds like crossed pairs, or flipped jumpers, but that should only be possible if the digital voice adapter (the voice 'modem') is wired into the building system...
Either way, let us know what they find - it's an interesting sounding problem!