Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2007-06-19
2007-06-19
Kizou, Hassan (Department: 2616)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S528000
Reexamination Certificate
active
10888724
ABSTRACT:
The invention solves the problem of DTMF delay by shifting the delay and in-band signal processing to the receiving packet gateway. The transmitting gateway continues to process and transmit voice packets while also detecting DTMF signals. The receiving gateway's jitter buffer holds voice packets for the worst-case DTMF detection period. As the receiving gateway is about to play out a voice packet it checks to see if a packet has arrived indicating DTMF was present. If not, the voice is played out as usual. If DTMF is present, the voice is muted and a DTMF generator invoked by the receiving gateway to recreate the DTMF signaling. The audio remains muted until no more time periods are marked as containing DTMF. In this way, the delay in voice playout due to the possible presence of DTMF is completely subsumed in the normal jitter buffer delay.
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Ahmed Salman
Cisco Technology Inc.
Kizou Hassan
Marger & Johnson & McCollom, P.C.
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