Silent redial system for VoIP modem

Details Silent redial system for VoIP modem Silent redial system for VoIP modem

2006-07-25

2006-07-25

Duong, Frank (Department: 2616)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C379S359000, C379S362000

Reexamination Certificate

active

07082123

ABSTRACT:
A redial system for a VoIP modem includes a subscriber line interface circuit (SLIC) for interfacing analog telephone signals from a telephone set to the VoIP modem and for generating redial signals to a public switched telephone network (PSTN), a first relay for connecting the telephone set with the PSTN or connecting the telephone set with the SLIC, a dummy load, a second relay connected between the PSTN and the dummy load for establishing or de-establishing a connection between the PSTN and the dummy load, a third relay connected between the first relay and the SLIC for establishing or de-establishing a connection between the first relay and the SLIC, and a control circuit for controlling the second and third relays to establish the connection between the PSTN and the dummy load and de-establish the connection between the first relay and the SLIC during the generation of the redial signals.

REFERENCES:
patent: 6345047 (2002-02-01), Regnier
patent: 6377570 (2002-04-01), Vaziri et al.
patent: 6424647 (2002-07-01), Ng et al.
patent: 6614786 (2003-09-01), Byers
patent: 6700956 (2004-03-01), Chang et al.
patent: 6914978 (2005-07-01), Huang et al.

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