Telefonaktiebolaget Lm Ericsson (publ)

Chiara Dotti

Mauro Bellora

Stephen Terrill

Nancy M Greene

Patrik Wiss

Gianluca Di Pasquale

A method of reserving credit for a mobile subscriber in respect of an IP multimedia service. The method comprises, following initial registration of the subscriber to the IP Multimedia service but prior to invocation of an IP Multimedia service, using the early session establishment procedure to reserve a credit amount at a charging control node and to notify an IP Multimedia Serving Element of the credit reservation, whereupon, at invocation of said IP multimedia service, the IP Multimedia Serving Element is able to proceed immediately with the session establishment.

Charging mechanisms for IP multimedia services

A method of transporting image or video information between end user terminals via a packet switched network whilst a circuit switched connection is established between the end users includes establishing a circuit switched connection between a plurality of end user terminals for carrying voice traffic. The method also includes using the. Message Session Relay Protocol (MSRP) to encapsulate image or video information transmitted between end user terminals via a packet switched network, where MSRP related traffic is routed between said end user terminals via one or more MSRP enabled nodes. Additionally, the method includes installing service policies into the or at least one MSRP node from a session initiation protocol (SIP) application server (AS) located in the control-plane of an IMS network and checking multimedia service requests against the installed policies to control end user terminal access to certain packet based services.

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Milan, Italy

Chiara Dotti