IP telephone system having a hold function and a callback...

Details IP telephone system having a hold function and a callback... IP telephone system having a hold function and a callback...

2006-01-06

2008-12-30

Tsang, Fan (Department: 2614)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C379S045000

Reexamination Certificate

active

07471673

ABSTRACT:
An IP telephone system having a function for holding a call connection when a first IP telephone terminal disconnects a call connection and a function for calling back from a second IP telephone terminal to the first IP telephone terminal when the call connection is in a hold state. The IP telephone system of the present invention includes a holding device. When the first IP telephone terminal goes into an on-hook state, an IP telephone exchange which manages the first IP telephone terminal switches the call connection between the first and second IP telephone terminals to a call connection between the holding device and the second IP telephone terminal. In addition, when the second IP telephone terminal requests a callback, the IP telephone exchange switches the call connection between the holding device and the second IP telephone terminal to a call connection between the first and second IP telephone terminals.

REFERENCES:
patent: 6600914 (2003-07-01), Uhlik et al.
patent: 6741696 (2004-05-01), Moriyama
patent: 7212521 (2007-05-01), Kwon
patent: 7289486 (2007-10-01), Yeom
patent: 2004363818 (2004-12-01), None
Draft report by the “Technical conditions related to the function of providing location information on callers sending emergency messages from cellular phones” May 2004, Committee for the Advancement of Emergency Message System, Information and Communications Technology Sub-Council, Information and Communications Council, Ministry of Internal Affairs and Communications.
Report by the “Study Group on IP Network Technology”, Feb. 2002, Study Group on IP Network Technology, Ministry of Internal Affairs and Communications.

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