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Interworking with media fallback

A technology of interactive work and media, applied in transmission systems, electrical components, etc., can solve problems such as call establishment failures

Active Publication Date: 2012-09-05
NOKIA TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Call setup shall always is a failure

Method used

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  • Interworking with media fallback
  • Interworking with media fallback
  • Interworking with media fallback

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] This embodiment will now be described based on an exemplary configuration in which an IP network is connected to a CS network via a gateway device having an interworking function. However, the present invention can be applied to any other network combination.

[0044] figure 1 A schematic block diagram showing an exemplary network structure according to this embodiment, wherein an IP network 10, such as a SIP-based IMS network, via a gateway device, such as a Media Gateway Control Function (MGCF) controlling a Media Gateway (MGW) 40 ) 20, connected to a CS network 30—such as an ISUP-based network. The gateway device 20 is configured to control the call state part of the media gateway 40 belonging to the connection control of the media channel. It may communicate with a Call Session Control Function (CSCF) eg as defined in 3GPP specification TS 23.228.

[0045] The gateway function may be obtained at the gateway device 20 by performing protocol conversion between CS-b...

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Abstract

The present invention relates to a method, network system, gateway device, and computer program product for enabling interworking between a first network domain which does not support downgrading of media compositions, and a second network domain which supports downgrading of media compositions. Establishment of a call with a first media composition is started in a first leg of the first network domain, by transmitting a first call set-up request for the first media composition from a gateway control function to the first network domain in response to the receipt of a set-up message at the gateway control function from a second network domain. The call with the first media composition is released and a call with a downgraded second media composition is set up by the gateway control function in the first network domain, in response to a rejection of the first call set-up request, by transmitting a second call set-up request for the downgraded second media composition from the gateway control function to the first network domain via the first leg. A session with the first media composition is updated in the second network domain to match the call with the downgraded second media composition being established in the first leg. Thereby, a fallback to the downgraded second media composition is supported even if the first network domain is inherently a non-fallback network, while standard terminals for the second network domain can still be used.

Description

technical field [0001] The present invention relates to a method, system, gateway device and computer program product enabling interworking between a first network domain that does not support media composition downgrade and a second network domain that supports media composition downgrade. Background technique [0002] In order to achieve access independence and maintain smooth interoperability across the Internet with wired terminals, the IP Multimedia Subsystem (IMS) core network specified in the 3GPP (Third Generation Partnership Project) specification TS 23.228 has been developed to be compatible with the IETF (Internet Engineering Task Force) "Internet Standards". IMS enables network operators of mobile or cellular networks to provide their subscribers with multimedia services based on and built on Internet applications, services and protocols. The intention is to develop such services by mobile network operators and other third-party providers (including third-party ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06
CPCH04L29/06421H04L29/06027H04L65/4038H04L65/1043H04L65/1069H04L65/103H04L65/1089H04L65/1095H04L65/1101
Inventor J·拉萨宁
Owner NOKIA TECH OY