Method of operating a modem in the presence of interrupted dial

Details Method of operating a modem in the presence of interrupted dial Method of operating a modem in the presence of interrupted dial

1997-11-13

1999-10-26

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

379 67, H04B 138, H04L 516

Patent

active

059740841

ABSTRACT:
According to the present invention, a method is provided enabling an analog modem to dial out while a dial tone is interrupted or stuttered due to at least one unheard message at a Central Office for a subscriber to Call Answer is provided . Call Answer is an automated voice messaging system which causes the dial tone of a phone line connected to the modem, to be either interrupted or stuttered when a message is waiting for the subscriber. Users of the present invention are able to receive on-line access faster than users of the prior art. The method of the present invention implements a software program within the modem. By comparing the elapsed length of the dial tone with two predetermined time values (a maximum and a minimum), the method detects the presence and status of the dial tone and informs the modem of the status of the dial tone. Provided that a dial tone is present, whether uninterrupted, interrupted or stuttered, the modem proceeds to dial out.

REFERENCES:
patent: 5448624 (1995-09-01), Hardy et al.

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