i have a computer setup to answer certain lines and give out info for my business. 3 lines run through my dk16 and have 3 ports on the switch. the problem is that when callers hang up, the system does not disconnect the port and the computer keeps playing. ive found the "AR detect" in program 15 and activated it, and this works to disconnect the line, but the port stays busy and this is worse than the line staying busy as well, because the line rings, because the port isnt answering, before it remained active. what can i do to make the station hangup when the line drops out?