I have a Partner ACS R6 with 2 door phones. They use ATT call notes for VM. I have 2 door phones that continue to ring forever if no one answers the call at the alert stations. I tried to install a VM pc card in the ACS and program a mailbox for an alert station (40) but it never answers the call. I can call direct to alert station and VM answers properly. It seems the door phone call is on the second IC path at the alert station, not sure if that matters. Any thoughts?