Portable-to-portable call transfer system for cordless telephone

• US 5,259,020 A
• Filed: 04/29/1992
• Issued: 11/02/1993
• Est. Priority Date: 06/06/1991
• Status: Expired due to Fees

• Current Assignee: Pioneer Communications Corp. (Pioneer Corporation), Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Communications Corp. (Pioneer Corporation), Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Hirano, Masahiro
• Primary Examiner(s): Ng, Jin F.
• Assistant Examiner(s): Cumming, William D.
• Application Number:
  US07/875,415
• Time in Patent Office: 552 Days
• Field of Search: 379/56, 379/58, 379/59, 379/60, 379/61, 379/63, 379/201, 379/210, 379/211, 379/212, 455/31.1, 455/33.1, 455/33.2, 455/39, 455/49.1, 455/53.1, 455/54.1, 455/73, 455/78
• US Class Current: 455/463
• CPC Class Codes: H04M 1/006 Call diverting means
• CPC Class Codes: H04M 1/72505 Radio link set-up procedures
• CPC Class Codes: H04M 1/72513 On hold, intercom or transfer communication modes

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.

Claims

1. A portable-to-portable call transfer system for cordless telephone having a base unit and a plurality of portable units where the base unit is connected with a portable unit over a radio channel, said base unit comprising:

a call-transfer requesting signal relay responsive to a transfer requesting signal from a calling portable unit, said relay holding an incoming call while also transmitting both said transfer requesting signal and a channel number of a talk channel to a called portable unit over a control channel;

a portable-to-portable line setting section for establishing a portable-to-portable line by connecting a receiver output of a transmitter-receiver to a transmitter input of the transmitter-receiver so as to enable said calling portable unit to send a voice message to said called portable unit upon reception of an off-hook signal from said called portable unit, said portable-to-portable line setting section transmitting said off-hook signal to said calling portable unit over said talk channel; and

a portable-to-portable line disabling section for disabling said connection of the receiver-output-to-transmitter-input and for connecting the incoming call to said called portable unit upon reception of an on-hook signal from said calling portable unit;

said each of said plurality of portable units comprising;

a call-transfer requesting signal generator for outputting a call-transfer requesting signal to said base unit, said call-transfer requesting signal indicating a portable unit to which said incoming call is transferred;

a call-transfer line setting section for permitting to send said voice message upon reception of said off-hook signal via said base unit; and

a call-transfer line disabling section for establishing a talk channel between said base unit upon reception of said on-hook signal via said base unit.