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Method of Reducing Inter-Working Load on a Gateway by Using Multi-Protocol Phones and Crank-Back Information From the Network

IP.com Disclosure Number: IPCOM000010422D
Publication Date: 2002-Nov-27
Document File: 5 page(s) / 280K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that uses a Multi-Protocol Phones and Crank-Back of information from the network to reduce the inter-working load on a Gateway. Benefits include faster call setup times and reduced loads at the Gateway.

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Method of Reducing Inter-Working Load on a Gateway by Using� Multi-Protocol Phones and Crank-Back Information From the Network

Disclosed is a method that uses a Multi-Protocol Phones and Crank-Back of information from the network to reduce the inter-working load on a Gateway. Benefits include faster call setup times and reduced loads at the Gateway.

Terminology

Following terminology has been used in the following sections.

  • Crank-back: The procedure where a multi-protocol phone learns about the protocol capability of the destination endpoint
  • Call Initiate Message: The first message issued by the multi-protocol phone to declare the User’s intent to initiate the call.
  • End-User: Entity initiating or terminating the call.
  • IE or Information Element: This refers to the information carried in any signaling message of a call signaling protocol.
  • Multi-protocol phone: A phone which can use multiple protocols. Further such a phone will have the ability to switch the protocol used to establish the call across its various supported protocols transparently to the user of this phone.
  • Response: The first response to the call initiate message providing the status of the call to the call originator.
  • PRT1, PRT2, PRTn: These are used as symbols to refer to distinct call signaling protocols, like H323, SIP, ISDN, etc
  • Traditional Inter-working: This refers to the presently employed methods of inter-working where every signaling message of one protocol is translated to the signaling message of the other protocol.

Background

Currently, a Gateway is used to inter-work a call originating from a network supporting one protocol and destined to a network supporting another protocol. For example, a call originating from an ISDN phone and destined to a H323 phone. In this example, it is the responsibility of the Gateway to translate every ISDN signaling message to a H323 signaling message, and vice-versa (see Figure 1).

The Gateway needs to translate signaling message for any call going across networks supporting distinct protocols. The protocol supported by the destination endpoint is generally not known to the originating endpoint at the time of call initiation. The Gateway acquires this information when the first call signaling message is routed across the network. This message, and all subsequent exchange of messages are inter-worked at the Gateway. To support large call density, Gateways incur heavy costs in implementation.

General Description

Summary

The disclosed method reduces the inter-working load at the Gateway. The inter-working load at the Gateway can be reduced by:

  • Reducing the number of messages being translated.
  • Reducing the number of call contexts being maintained at Gateway.

The disclosed method proposes that the originating endpoint acquires the protocol supported by the destination endpoint, and then subsequently uses the destination endpoint protocol to establish the call. This significantly reduces the load on the Gateways since these network element...