I just replaced an old 8X24 system with a BCM 50 with 3.0 software. My customer had a Nortel Norstar doorphone hooked up to the old system. When I went to connect it to the new system, it doesn't work. The only thing that happens is when someone pages, I can hear it through the door phone. When I press the button to ring the hunt group, nothing. Any ideas as to what I could be doing wrong? Is it possibly a compatibility issue? Thanks!