The Instant Messaging capability of an IP multimedia subsystem is utilized to support call transfer service for VoIP users. A call transfer request from a first VoIP user to a second VoIP user is sent to the IP multimedia subsystem in a predetermined non-standard SIP communication. The IP multimedia subsystem invokes Instant Messaging service in response to the predetermined non-standard SIP communication, and Instant Messaging service is then utilized to support the call transfer dialogue.

 
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< Wireless communication method and apparatus for providing multimedia broadcast services

> Methods and systems for self-describing multicasting of multimedia presentations

> Conditional access method and DMB system for regionally limiting DMB reception
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