Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2004-11-22
2009-02-03
Chan, Wing F (Department: 2619)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S526000, C379S093260
Reexamination Certificate
active
07486665
ABSTRACT:
A communication device, such as a Voice over Internet Protocol (VoIP) gateway, determines a duration for Dual Tone Multi-Frequency (DTMF) tone portions of telephony signal. If the duration is less than a pre-determined amount, a minimum duration is enforced during DTMF playback at a remote end of a network connection connected to a destination gateway. Minimum playback duration can be enforced at the terminating gateway—however, the originatinggateway can also encode a DTMF packet with a minimum duration value. At the terminating receiver it is not always possible to playback exactly what happened at the originating point in the same time frame. One solution to is to, at the terminating gateway, drop the first portion of voice packets that overlap with the end portion of played back DTMF tones.
REFERENCES:
patent: 5010567 (1991-04-01), Tsushima
patent: 5438618 (1995-08-01), Jantzi et al.
patent: 5638436 (1997-06-01), Hamilton et al.
patent: 6259691 (2001-07-01), Naudus
patent: 6961424 (2005-11-01), Vialle et al.
patent: 2002/0154760 (2002-10-01), Branden
patent: 2004/0101128 (2004-05-01), Sauvage et al.
RFC2833, RTP Payload for DTMF Digits, Telephone Tones and Telephony Signals, Internet RFC/STD/FYI/BCP Archives, http://doc.rz.ifi.lmu.de/rfc/rfc2822/html., pp. 1-23.
Haider Salman
Kuhne Jason A.
Kunapuli Subrahmanyam V.
Mekala Anantha R.
Chan Wing F
Cisco Technology Inc.
Hamilton Brook Smith & Reynolds P.C.
Tsegaye Saba
LandOfFree
Transport of DTMF tones over VOATM/VOIP networks does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transport of DTMF tones over VOATM/VOIP networks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transport of DTMF tones over VOATM/VOIP networks will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4132828