Error handling for named signal events in wireless...

Multiplex communications – Communication over free space

Reexamination Certificate

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Details

C370S311000, C370S312000, C370S328000

Reexamination Certificate

active

08005029

ABSTRACT:
The present invention provides a technique for handling damaged named signal event (NSE) packets that are received in association with a voice over packet based telephony call. The received packets for a telephony call may include voice packets as well as NSE packets. Upon receipt of the packets at a physical layer, the packets are processed at a link layer to detect damaged packets having link layer errors. The incoming packets are sent to an audio application at an application layer for further processing. For damaged packets, link layer error indicia is generated at the link layer and sent to the audio processing application. The audio application will use the link layer error indicia to identify damaged packets or payloads associated with damaged packets, and determine whether the payloads corresponding to the damaged packets include NSE information defining an NSE. Damaged NSE packets are processed accordingly.

REFERENCES:
patent: 2006/0092963 (2006-05-01), Bakre et al.
patent: 2006/0120284 (2006-06-01), Kim et al.
Schulzrinne/Petrack, “RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals,” Internet Engineering Task Force Internet Draft, May 28, 2002, draft-ietf-avt-rfc2833bis-00.txt, Expires Dec. 2001.
Schulzrinne, H. and Petrack, S., “RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals,” Internet Engineering Task Force Internet Draft, Oct. 21, 2002, draft-ietf-avt-rfc2833bis-01.txt, Expires Mar. 2003.
Schulzrinne, H. and Petrack, S., “RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals,” Internet Engineering Task Force Internet Draft, Dec. 5, 2002, draft-ietf-avt-rfc2833bis-02.txt, Expires Apr. 2003.
Schulzrinne, H. and Petrack, S., “RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals,” Internet Engineering Task Force Internet Draft, Jul. 1, 2003, draft-ietf-avt-rfc2833bis-03.txt, Expires Dec. 2003.
Schulzrinne, H. and Petrack, S., “RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals,” Audio/Video Transport (avt) Internet-Draft, Nov. 9, 2005, draft-ietf-avt-rfc2833bis-12.txt, Expires May 13, 2006.

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