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Audio frequency net gate way apparatus

An audio and gateway technology, applied in the field of audio gateway devices, can solve problems such as audio data delay

Inactive Publication Date: 2003-03-19
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Additionally, since audio packets and control packets are transmitted over the same processor bus 44, there are other issues with audio data delay and jitter effects

Method used

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  • Audio frequency net gate way apparatus
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  • Audio frequency net gate way apparatus

Examples

Experimental program
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Embodiment Construction

[0016] Preferred embodiments of the present invention will now be described. In the preferred embodiment of the present invention, the audio gateway device includes: PSTN line termination part 1; audio data processing part 2; header processing part 3; packet network line termination part 4 and gateway control part 5.

[0017] The PSTN line terminating section 1 includes: a device for terminating (terminating) PSTN (Public Switched Telephone Network) data and outputting the audio data to the audio data processing section 2; and processing output from the audio data processing section 2 according to the PSTN protocol Audio data, and output PSTN data result means.

[0018] The audio data processing section 2 includes converting the audio data output from the PSTN line terminating section 1 into packets, and outputting a header of a real-time transport protocol (RTP) for real-time data stream transmission and an RTP packet with a session number appended to the header Apparatus fo...

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PUM

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Abstract

A gateway device includes PDTN line terminating portion 1 , audio data processing portion 2 , header processing portion 3 , packet network line terminating portion 4 and gateway control processor 5 . Header processing portion 3 receives an RTP packet with session number from audio data processing portion 2 and outputs an IP packet attached with UDP / IP header information to packet network line terminating portion 4 . Header processing portion 3 receives an IP packet from packet network line terminating portion 4 and checks UDP / IP header thereof When the IP packet is an audio packet, header processing portion 3 deletes the UDP / IP header, attaches a session number thereto and outputs an RTP packet with session number to audio data processing portion 2 and, when the IP packet is an audio packet, header processing portion 3 transfers it directly to audio data processing portion 2 to send the audio data to the PSTN through PSTN line terminating portion 1.

Description

technical field [0001] The invention relates to the technology of transmitting audio data through a packet network, in particular to an audio gateway device. Background technique [0002] IP (Internet Protocol) telephony service (IP technology) that transmits audio data over a packet network has become very popular. In addition, efforts to reduce the cost of the existing circuit-switched telephone network by constructing the backbone of the telephone network using a packet network and unifying telephone services using packet services are becoming more and more active year by year. [0003] In telephone service using a packet network, a gateway device that transmits existing telephone audio data via the packet network is required. Audio processing and session control (session ON / OFF control) are performed in such a gateway device. An example of a conventional audio gateway is the VoIPMedia Gateway Module, a product of the company AudioCodes. [0004] Figure 6 A block diag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/66H04L12/70H04L29/06H04M3/00
CPCH04L65/103H04L65/104H04L29/06027H04L65/1101
Inventor 大岛喜信山野悟
Owner NEC CORP