Patent ID: 8238904

Claim:
A method of making network services available to a subscriber of a first mobile communications network when the subscriber roams in a second mobile communications network, comprising: intercepting in the first mobile communications network a signaling message issued by a service switching function of the second mobile communications network as a consequence to a service request by the subscriber, the signaling message including service addressing data comprising an address of a service control function in the first mobile communications network, a service code, and a service key, the intercepting occurring before the signaling message reaches the service control function; parsing the signaling message, wherein said parsing comprises searching for the presence of an admissible service code by comparing the service code with a list of admissible service codes in a service codes database; if an admissible service code is not present, forwarding the signaling message; and if an admissible service code is present, modifying the signaling message by replacing the service addressing data with an address corresponding to the admissible service code, and replacing the service key with a service key corresponding to the admissible service code.