METHOD AND SYSTEM FOR TRANSMITTING MESSAGE TO SUBSCRIBER IN SETTING STAGE OF TELEPHONE INCOMING CALL

摘要

PROBLEM TO BE SOLVED: To prevent delay and the lack of synchronization by simulating the operation of a telephone terminal so that a first message transmitted from a local exchange is received and stored and simulating the operation of the local exchange so that the copy of the first message is transmitted to the telephone terminal. SOLUTION: A center access node 5 is connected to a local exchange 9 by a two wire telephone line 8 and each network terminal 6 is connected to one or plural telephone terminals 10 by the two wire telephone lines 8. The center access node 5 generates a same message modulated by a modulator in a sound frequency band from a message received from the local exchange, demodulated in a demodulator and stored in the memory. The message is transmitted to the network terminal 6 on a channel allocated to a transmission means 7 and the latter permits the modulated message to permeably pass through the telephone terminal 10.