Private branch exchange and telephone switching system
AssigneeKabushiki Kaisha Toshiba
InventorAtsushi Yoshihara
Life of this patent
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Abstract
According to one embodiment, a private branch exchange includes a receiver which receives caller ID information divided into a plurality of packets, the caller ID information specifying a caller side telephone set, when receiving an incoming call, a measurement unit which measures an elapsed time after the receiver has received the packets, a reset unit which resets the elapsed time measured by the measurement unit when the receiver receives the packets, and a transmitter which transmits the packets received by the receiver to a private telephone set on an incoming call side, as caller ID information, when the elapsed time measured by the measurement unit exceeds a specified time.
Claims8
A private branch exchange connected to a public switched telephone network to a plurality of private telephone sets, comprising:
- a receiver which receives caller ID information divided into a plurality of packets, the caller ID information specifying a caller side telephone set, when receiving an incoming call;
- a measurement unit which measures an elapsed time after the receiver has received the packets;
- a reset unit which resets the elapsed time measured by the measurement unit when the receiver receives the packets;
- and
- a transmitter which transmits the packets received by the receiver to a private telephone set on an incoming call side, as caller ID information, when the elapsed time measured by the measurement unit exceeds a specified time.
A telephone switching system, comprising:
- a private branch exchange connected to a public switched telephone network;
- and
- a plurality of private telephone sets housed in the private branch exchange, wherein the private branch exchange includes:
- a first receiver which receives caller ID information divided into a plurality of packets, the caller ID information specifying a caller side telephone set, when receiving an incoming call;
- a measurement unit which measures elapsed time after the first receiver receives the packets;
- a reset unit which resets the elapsed time measured by the elapsed time when the first receiver receives the packets;
- and
- a transmitter which transmits the packets received by the first receiver to a private telephone set on an incoming call side, as caller ID information, when the elapsed time measured by the measurement unit exceeds a specified time;
- and wherein the private telephone set includes:
- a second receiver which receives the caller ID information of the caller side telephone set when receiving the incoming call from the private branch exchange;
- and
- a display which displays contents of the caller ID information received from the second receiver.
Dependencies are inferred from the claim text.