Method, system and equipment for establishing user conversation bearer service

The invention discloses a method for establishing user session bearing service, a system, a strategy control and charging rule functional entity and a strategy and charging implementation entity. The method comprises the steps that: after receiving a session bearing service establishment request from a user device, the strategy and charging implementation entity sends the strategy control and charging rule functional entity credit control request information carrying user identification; the strategy control and charging rule functional entity inquiries about user information according to the user identification, judges and generates routing strategy information according to the user information inquired, and feeds credit control response information carrying the routing strategy information back to the strategy and charging implementation entity; the strategy and charging implementation entity establishes session bearing service according to the routing strategy information and carries out user service data stream according to the routing strategy. The invention solves the problem that the strategy control and charging rule functional entity cannot forward messages needing forwarding to a new address which is not the original destination address of the messages.