FremgangsmÕte for Õ utvide bruken av SIP (Session Initiation Protocol)

摘要

A method of extending the use of SIP (Session Initiation Protocol) in a communication system wherein H.323 or SIP-compliant end-points communicate with the media traffic directly between other H.323 or SIP-compliant end-points. An extension of the SIP protocol is utilized to provide better support for charging. A plurality of equivalent INVITE messages are sent to the SIP server at regular time intervals for the duration of the session. Charging for SIP conversations can be determined in a very accurate and expedient manner by observing when the INVITE messages cease, indicating that the conversation between the two end-points is concluded.