Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Reexamination Certificate
2005-11-01
2005-11-01
Ho, Duc (Department: 2665)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via frequency channels
C370S252000
Reexamination Certificate
active
06961351
ABSTRACT:
The present invention relates to holding a call being executed between communication devices in a communication system which has a first function for a holding party of the communication devices to hold the call by transmitting a first request signal to a held party and a second function for the holding party to hold the call by transmitting a second request signal to the held party and receiving a response signal. The holding party transmits the second request signal first and when the response signal is not returned within a given time, transmits the first request signal. A transit device for relaying a call between communication devices, unless detecting the response signal within a given time after relaying the second request signal, transmits the first request signal to the held party, generates the response signal and transmits the generated response signal to the holding party.
REFERENCES:
patent: 6587553 (2003-07-01), Shaffer et al.
patent: 6606668 (2003-08-01), MeLampy et al.
patent: 6614784 (2003-09-01), Glitho et al.
patent: 6757374 (2004-06-01), Bardehle
Fukushima Satoru
Iwasaki Yasutaka
Kawai Kensuke
Tsuchiya Yasuhiro
Ho Duc
Kattan Muchin Rosenman LLP
Tran Thien D.
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