Voice-and-data modem call-waiting

Details Voice-and-data modem call-waiting Voice-and-data modem call-waiting

1995-07-20

1996-05-21

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 93, 379215, H04M 1106, H04M 320

Patent

active

055197671

ABSTRACT:
The call-waiting feature is supported on voice-and-data modems (22,25) by causing voice-and-data modems to go into voice-only mode upon receipt of the modem clear-down signal (352-354). A first voice-and-data modem engaged in an initial voice-and-data call with a second voice-and-data modem responds to receipt (202) of a call-waiting signal by generating (204) a replica of the call-waiting signal on the user's audio channel. The first modem responds to a user request (300) to pick up the waiting call by sending (306) the modem clear-down signal to the second voice-and-data modem, going (312) into voice-only mode, and transmitting (314) a waiting-call acceptance signal. The initial call that is placed (332) on hold is thus a voice-only call. While in a voice-plus-data picked-up waiting call, the first modem responds to a user request (400) to reinstate the initial call by again sending (406) the modem clear-down signal, going (412) into voice-only mode, and transmitting (422) a call-resumption signal. The first modem is thus in voice-only-mode when it is reconnected (454) to the initial, voice-only, call. The re-connected initial call may now be re-converted into a voice-plus-data call in the conventional manner (424-488).

REFERENCES:
patent: 4852151 (1989-07-01), Dittakavi et al.
patent: 4995074 (1991-02-01), Goldman et al.
patent: 5081647 (1992-01-01), Bremer
patent: 5287401 (1994-02-01), Lin

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