Communication terminal and the method using the same

Details Communication terminal and the method using the same Communication terminal and the method using the same

1993-07-08

1995-06-20

Kuntz, Curtis

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 94, 379100, H04M 1100

Patent

active

054266920

ABSTRACT:
A communication terminal having an interface to which its components including an analog telephone are connected and which enables communication with another terminal at the other end of a line of the integrated services digital network. A first tone is generated to set the period of time for dialing of the analog telephone, a second tone different from the first tone is generated to set the period of time for connection between the analog telephone and the terminal at the other according to the dialing during the period of time when the first tone is being generated, and a third tone different from the first and second tones is generated to set the period of time for terminating communication using the analog telephone when the connection established during the period of time when the second tone is being generated is cancelled. Each of first, second and third tones generated is output to the analog telephone.

REFERENCES:
patent: 4718057 (1988-01-01), Venkitakvishnan et al.
patent: 4821312 (1989-04-01), Horton et al.
patent: 4922484 (1990-05-01), Yoshida et al.
patent: 4961185 (1990-10-01), Sawada
patent: 5067125 (1991-11-01), Tsuchida
patent: 5113396 (1992-05-01), Kagami
patent: 5113432 (1992-05-01), Van Santbrink et al.
patent: 5187736 (1993-02-01), Moriizumi
"Study on Subscriber Line Circuits Applicable for Analogue Telephone and ISDN Interfaces", IEEE International Conference on Communications, BOSTONICC/89, S. Fujii et al. 1989, pp. 1413-1417.

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