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End-to-end voice over ip streams for telephone calls established via legacy switching systems

A voice and telephone technology, applied in the network, transmission system, digital transmission system and other directions of the telephone service provided, can solve the problem of not using signaling data, etc.

Inactive Publication Date: 2008-01-09
SIEMENS ENTERPRISE COMM GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The above disadvantages do not apply to signaling data, which can pass through intermediate gateways without difficulty and through the associated voice switch

Method used

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  • End-to-end voice over ip streams for telephone calls established via legacy switching systems
  • End-to-end voice over ip streams for telephone calls established via legacy switching systems

Examples

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Embodiment Construction

[0045] The invention concerns the convergence of voice and data networks: both networks currently exist. In the method and apparatus of the present invention, the control operation remains in the existing voice switch that will still be used.

[0046] Therefore, the present invention follows the method of network development and evolution, and retains the most useful characteristics of the existing network. The alternative, to throw away all existing equipment and build a new network from scratch, is too expensive and risky for most operators.

[0047] FIG. 3 illustrates a call between an IP phone 10 and a conventional phone 80 (numbering according to the scheme in FIG. 2). While signaling 90 passes through gateways 61-66, voice data 95 passes directly between gateway 61 and gateway 66.

[0048] In order to establish packetized voice transmission over an IP network between two gateways, signaling is required between the two gateways for the following purposes: exchange of IP...

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Abstract

A method of transmitting telephone conversations over a telephone system comprising a number of voice switches each connected to a packet switched data communications network by respective gateways comprises the steps of establishing a first call path for voice data and control data over packet switching links, through gateways and voice switches, between a calling party and a called party A second call path is established directly over the packet switching network between an end ingress gateway (61), being the gateway first encountered on the call path emanating from the calling party, and an end egress gateway (66), being the final gateway encountered on the call path before reaching the called party Voice data is transmitted over the second call path from the end ingress gateway (61) to the end egress gateway (66); and control data is transmitted over the first data path; wherein the first call path is maintained ready to transmit voice data in the event that the second call path is not available, or is not desired.

Description

[0001] This application is a divisional application of an application dated October 29, 2001, application number 01818317.4, and title of invention "End-to-end voice over IP stream for telephone calls established through traditional switching systems". technical field [0002] The present invention relates to the transmission of telephone calls over packet switched networks. Background technique [0003] On the voice switching network based on ISDN technology, the voice switch uses circuit switching technology to provide an on-demand connection with a fixed bit rate (typically 64K bits / second) between phones. In the simplest case, a network consists of a single voice switch with a large number of telephones, each connected to the voice switch by a physical circuit called a telephone line. Typically, a network includes multiple voice switches, each with multiple telephone lines, interconnected by physical circuits called trunks. Each pair of voice switches in the network can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M7/00H04Q3/00H04L12/64H04L29/06H04M7/06
CPCH04L65/103H04M7/06H04L29/06421H04L29/06265H04L2012/6486H04M7/0093H04L29/06027H04M7/006H04M7/1245H04L29/06326H04L29/06244H04L12/6418H04L65/104H04L29/06272H04L65/4038H04L65/1043H04L65/1069H04L65/1101
Inventor J·R·埃尔维尔D·麦克内利
Owner SIEMENS ENTERPRISE COMM GMBH & CO KG
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