Method, apparatuses and computer program for dynamically configuring a proxy call session control function of the IP multimedia subsystem from a policy control rules server

摘要

The present invention faces the problem of network scenarios where there is no user differentiation, and where sessions established through an IP Multimedia Subsystem always proceed in the same way regardless user categories and regardless whether a user has accessed through a fixed or a mobile network. To this end, the present invention provides for a new method for dynamically configuring a Proxy Call Session Control Function of the IP Multimedia Subsystem from a Policy Control Rules server responsible for installing control rules to authorize media flows at an entity in the bearer layer. This entity in the bearer layer may be a Policy and Charging Enforcement Point of a PCC architecture, whereas the Policy Control Rules server may be a Policy and Charging Control Rules of the PCC architecture.

主权项

1. A Proxy Call Session Control Function (P-CSCF) server for enabling multiple users to access, through one or more types of IP connectivity access network (IP-CAN), an IP Multimedia Subsystem (IMS) offering multimedia services to the users, wherein the P-CSCF server is configured to perform the following for each user and access type:
receive a registration request from a user having a signaling session established through an IP-CAN with the P-CSCF server, the registration request requesting to access the IMS; send to a Policy Control Rules server, a configuration request for P-CSCF configuration data to configure the P-CSCF server, said configuration request including information identifying the user; receive from the Policy Control Rules server, the P-CSCF configuration data, the P-CSCF configuration data being dynamically selected by the Policy Control Rules server and including:
one or more instructions to modify or reject service information in transit between the user and the IMS based on access-related user information; andinformation about an access type of the IP-CAN through which the user has established the signaling session with the P-CSCF server; configure the P-CSCF server in accordance with the dynamically selected P-CSCF configuration data; and modify or reject service information in transit between the user and the IMS based on the received information about the access type of the IP-CAN.