Patent ID: 8725141
Filing Date: 2014-05-13
Classification: H04L,H04M,H04W

Abstract:
1. A system of providing access to an IP multimedia subsystem for a subscriber communicating in an access communication network and requesting access to said IP multimedia subsystem through a home interface entity located in the home communication network of said subscriber, said IP multimedia subsystem being a packet switched based domain located in said home communication network and comprising serving means for home subscribers storing profile data of said subscriber and home network data identifying said home communication network and call state control functionality means controlling service calls within said IP multimedia subsystem, the system comprising: the home interface entity adapted to: a component adapted to compare said home network data and said access network data, a component adapted to check if said subscriber is allowed to roam based on a set of predefined criteria when the result of said comparison is false, a component adapted to send a message comprising said access network data to at least one of said call state control functionality means when the result of said checking is true.