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Communications system

A communication system, a technology for recovering information, applied in the field of communication, can solve the problem of not being able to fully control for a long time, etc.

Inactive Publication Date: 2008-05-28
TELEFON AB LM ERICSSON (PUBL) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ACF will not be able to fully control the failure for unacceptably long periods of time due to possible long call hold times

Method used

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  • Communications system
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Examples

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Embodiment Construction

[0010] Figure 1 shows an IP communications network comprising a plurality of small islands A, B interconnected by a backbone network C containing links (not shown) of limited capacity. Inter-island calls are controlled by a call control function (CCF) K,L in each islet. The allocation of link resources to multiple calls between islets is controlled by one ACF D, E within each islet. Each islet also contains a replacement ACF F, G that takes over in the event of an initial ACF failure. Island A also includes one or more IP telephony terminals, represented by terminal H, and islet B also includes one or more IP telephony terminals, represented by terminal J.

[0011] The sequence of events followed in establishing and tearing down a successful call from IP telephony terminal H to IP telephony terminal J will be described below in conjunction with FIG. 2 , namely:

[0012] 1. The calling terminal H contacts the local call control function K and provides the identifier (eg an E....

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Abstract

A communications system comprising a plurality of islands, a media path comprising resources for carrying data in a plurality of calls between first and second ones of the islands in which each of the first and second islands comprises control means for managing allocation of the resources of the media path between the plurality of calls; in which the system also comprises means for detecting a faulty control means and either replacing the faulty control means with a working replacement control means or recovering the faulty control means to working order; in which the system also comprises means for providing from a further control means to the replacement or recovered control means on replacement or recovery information on the allocation of the resources of the media path.

Description

technical field [0001] The present invention relates generally to the field of communications and in particular to recovery from failures in communications systems. Background technique [0002] Multimedia communication services over packet-based networks (PBNs) that may not provide guaranteed quality of service are described in ITU-T Recommendation H.323 (February 1998). The packet-based network over which the H.323 entities communicate may be point-to-point connections, separate network segments, or Internet networks with multiple segments and possibly complex topologies. ITU-T Recommendation E.164 (May 1997) describes the International Public Telecommunications Numbering Plan. [0003] A typical IP telephony system includes multiple hosts interconnected by a backbone network consisting of multiple routers to which the multiple hosts are connected. These hosts are grouped into network "islands" with high bandwidth available between all hosts on an island. These high ban...

Claims

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Application Information

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IPC IPC(8): H04L12/24H04B1/74H04L1/22H04L12/56H04M7/00
CPCH04M7/0084H04M3/08H04B1/74H04L1/22H04L41/0668
Inventor S·C·雷J·A·阿伦
Owner TELEFON AB LM ERICSSON (PUBL)
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