Off-hook detection and soft line seizure for telephone line sharing in a computer system

摘要

A method for processing an incoming call on a telephone line in a computer system, wherein a telephony circuit detects a pick-up by a parallel device coupled to the telephone line while maintaining high voltage isolation. The telephony circuit performs hard line seizures to cause the parallel device to hang-up and soft line seizures to prevent a central office hang up after the parallel device hangs up.