Portable-to-portable call transfer system for cordless telephone

Details Portable-to-portable call transfer system for cordless telephone Portable-to-portable call transfer system for cordless telephone

1992-04-29

1993-11-02

Ng, Jin F.

Telephonic communications

Audio message storage, retrieval, or synthesis

455 541, H04M 1100, H04B 100

Patent

active

052590208

ABSTRACT:
A portable-to-portable call transfer system for cordless telephone. The base unit is connected with a portable unit over a radio channel. The call-transfer requesting signal relay responds to a transfer requesting signal from a calling portable unit to hold an incoming call while also transmitting both the transfer requesting signal and the channel number of a talk channel to a called portable unit over a control channel. The portable-to-portable line setting section transmits the off-hook signal to the calling portable unit over the talk channel and connects the receiver output of a transmitter-receiver to the transmitter input of the transmitter-receiver so as to enable the calling portable unit to send a voice message to the called portable unit upon reception of an off-hook signal from the called portable unit. The portable-to-portable line disabling section disables the connection of the receiver-output-to-transmitter-input and connects the incoming call to the called portable unit upon reception of an on-hook signal from the calling portable unit. The call-transfer requesting signal generator outputs a call-transfer requesting signal to the base unit. The call-transfer requesting signal indicates a portable unit to which the incoming call is transferred. The call-transfer line setting section permits to send the voice message upon reception of the off-hook signal via the base unit. The call-transfer line disabling section establishes a talk channel between the base unit upon reception of the on-hook signal via the base unit.

REFERENCES:
patent: 3644681 (1972-02-01), Rice
patent: 4112257 (1978-09-01), Frost
patent: 4939785 (1990-07-01), Murata et al.

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