Problem with Project Fi Nexus 6 and apartment entry system

[AC Question]

i have a problem with Nexus 6 and Project fi-My apt complex has an entry system which is

programed to allow a visitor to enter your apt.# on a keypad and it rings your phone, you answer and key a code and the door opens. Project fi does not ring the phone, instead goes directly to generic VM, Hence no way to admit a visitor. Suggestions please???

the device is a Trigon MinipakII