Hi, i just setup my 1st avaya using IPO ftp://ftp.avaya.com/incoming/Up1cku9/SoftwarePub/3_0DT/ADMIN3_0_580.exe and now want to connect the door intercom from my old BT versatility unit. I am trying to find the "how to" in the manual but cant - any ideas ? The IP403 DT has 2 x POTS ports on the front that i am assuming i can connect to but then i guess the setup is somewhere - but where ?