Call reservation technique for a subscriber of another exchange

Telephonic communications – Special services – Service trigger

Patent

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Details

379208, 379209, H04M 348

Patent

active

059334851

ABSTRACT:
A call reservation technique of a first exchange serving a call of an outgoing subscriber and a second exchange serving a call of an incoming subscriber includes: outputting a message requiring a call reservation registration from the first exchange to the second exchange at the time of reserving the call, and in the second exchange, storing call reservation information according to the message requiring the call reservation registration, the second exchange being transferred to a state of the call reservation registration in response to the message requiring the call reservation registration and simultaneously outputting a call reservation registration response message, and in the first exchange, storing the call reservation information according to the call reservation registration response message and the first exchange being transferred to a state of a call reservation; and checking the state of the incoming subscriber in the state of the call reservation registration in the second exchange and then inputting the message requiring the call reservation service to the second exchange when the incoming subscriber is in an idle state, and checking the state of the outgoing subscriber according to the message requiring the call reservation service in the first exchange and then forming a calling path of the outgoing subscriber and the incoming subscriber in the first exchange and the second exchange and processing the call, when the outgoing subscriber is in the idle state.

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patent: 5559877 (1996-09-01), Ash et al.

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