Patent ID: 9614876
Date: 2017-04-04
CPC Classifications: H04L,H04W

Claim:
1. An Access Gateway Node (MAGCF) for providing access to an IP multimedia system for a circuit-switched controlled user's terminal located in a circuit-switched controlled domain, wherein said node comprises: a circuit-switched function configured to provide exchange signaling for a circuit-switched controlled user's terminal, wherein said circuit-switched function is configured to interact with a home register located in a home circuit-switched controlled domain to obtain from the home register, a user's IP multimedia system parameter, the user's IP multimedia system parameter being an indication that a subscription of the circuit-switched controlled user's terminal has been ported to the IP multimedia system; a user agent configured to utilize the user's IP multimedia system parameter to register the circuit-switched controlled user's terminal to the IP multimedia system on behalf of the circuit-switched controlled user's terminal, wherein the user agent registers the circuit-switched controlled user's terminal to the IP multimedia system without further signaling with the circuit-switched controlled user's terminal; and an exchange interface configured to exchange signaling between the user agent and the circuit-switched function.