My Modem Won't Hang Up

[abajan]

Anyone here familiar with FaxTalk Communicator SE 4.7 software? It came bundled with my Hiro V.92 56K USB modem and works pretty well. My only problem is that when a caller leaves a voice message and hangs up, the modem keeps recording until 15 seconds are up. That is the maximum time I have set for voice messages but that doesn't mean I want the modem to go on recording for 15 seconds each time! I can't find any settings in the software like "Hang up at conclusion of message" or anything like that.