Mobile telephone configurable as a monitor and a two way radio

Details Mobile telephone configurable as a monitor and a two way radio Mobile telephone configurable as a monitor and a two way radio

1998-04-07

1999-11-30

Chan, Wing F.

Telephonic communications

Emergency or alarm communications

Personal monitoring

455555, H04M 1104

Patent

active

059955899

ABSTRACT:
A telephony device is disclosed having a base station connectable to a switched network. At least two mobile units are connectable to the switched network through the base station to receive incoming calls in a normal mode. The first mobile unit is operable in a monitor mode, where ringing thereof is prevented when incoming calls are received in the monitor mode. A microphone of the monitoring unit has a higher gain in the monitor mode than in the normal mode. In the monitor mode, transmission of sound signals to monitoring unit is suppressed.

REFERENCES:
patent: 4503288 (1985-03-01), Kessler
patent: 4571455 (1986-02-01), Labock et al.
By Vitaly Lenchik et al. "Method for Remote Signaling Subscriber Unit into VOX Mode" Motorola Technical Developments vol. 22 Jun. 1, 1994, p. 74.

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