专利名称：CALL CHARGING NOTIFICATION发明人：JOHNSTON, ALAN, B.申请号：EP02789426申请日：20021104公开号：EP1464160A4公开日：20050803
摘要：An approach for providing charging information of a call established over a datanetwork is disclosed. A communications system includes a user agent that initiates a callto another user agent according to an application layer protocol. The system alsoincludes a network element that assists in establishing the call and forwards informationindicating that the call is chargeable to the user agent. The present invention hadparticular applicability to SIP (Session Initiation Protocol) IP (Internet Protocol)telephony services.
申请人：WORLDCOM, INC.
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