Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2007-01-02
2007-01-02
Rao, Seema S. (Department: 2616)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C375S222000, C379S283000, C379S386000
Reexamination Certificate
active
10112367
ABSTRACT:
The invented method involves one or more gateways sniffing the voice channel during the voice mode. If it is determined that V.8bis signals are being initiated, then the gateway breaks these exchanges by suppressing such signaling, thereby avoiding the above-described detrimental effects. Modem relay communications then are allowed to proceed. Briefly, the method and apparatus involve monitoring a call during a voice mode phase for an initiating signal representative of the defined signaling, the monitoring being performed by a local gateway and, if such an initiating signal is detected during the monitoring, then suppressing such detected signaling in such manner that the signaling does not reach the remote gateway. Preferably, the monitoring is for an initiating signal characterized by a dual tone of defined frequency and duration of approximately 1375 Hz and 2002 Hz for a duration of approximately 400 ms or 285 ms, in agreement with the ITU-T Recommendation V.8bis (standard) adopted by the International Telecommunication Union. Monitoring is continued at least until an answer back from an answering station is received by the gateway. When the suppression succeeds and the remote (non-initiating gateway that may be awaiting such an initiating signal halts any further V.8bis transaction attempts, the local gateway initiates a modem relay session of operation with the remote gateway.
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Garakani Mehryar Khalili
Jin Gavin
Tsai Chieh-Wen
Wildfeuer Herbert M.
Cisco Technology Inc.
Marger & Johnson & McCollom, P.C.
Rao Seema S.
Shew John
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