COMPULSORY CALL SETTING METHOD IN THE SAME SUBSCRIBER GROUP

摘要

The inner line subscribers are grouped adn a message is send to the subscirbers of a certain group using the speaker phoen of the subscriber. The method includes steps: (A) checking that to which group dialed phoen number belongs; (B) transmitting the busy tone to the transmitter when the dialed phone number kdoes not belong to the group or transmitting the ring signal to the receiver when the phone is not a speaker phoen; (C) chekcing that the jall subscriber of the group has speaker phones when the dialed phone number belongs to the group and checking that the subscribers are in communication; (D) transmitting the busy signal to the transmitter when the receiver has no speaker phone or the receiver is in communication; (E) transmitting the ring signals for a certain time, driving a CODEC and connecting the receiver's receiving time switches to the transmitter's transmitting time switch for one directional massage transmission; and (F) checking the replies from the receiver.