SIP2 Mobile gateway

A method to process a phone call between a user of an IP client and a called party attached to a mobile network, wherein said user of said IP client subscribes to mobile services from a mobile service provider, said method comprising:

• intercepting an invite message from said IP client by a phone server, said phone server further performing the steps:
• parsing said invite message;
• sending said invite message to a registry, location and services database to check if said called party is registered;
• sending said invite message to said called party if said called party is registered,
• sending said invite message to a signaling conversion component if said called party is not registered, said signaling conversion component mapping said invite message to a ISUP message, said signaling conversion component further communicating said ISUP message with a service control and call control component, said service control part starting a new call state, sending said ISUP message to VLR/MSC and sending an INAP message to a SCP, and said call control part communicating with a media gateway control component attached to said VLR/MSC, said media gateway control component further sending an MGCP message to a media gateway component to connect IP traffic into a trunk group of said media gateway component.