Patent ID: 7039431

Claim:
A method for providing a mobile communication service to a mobile station wherein said mobile station has subscription with a first telecommunications network and a second communications network and said mobile station has subscription to access one or more subscriber features associated with said second telecommunications network, comprising the steps of: receiving a request for call control instruction within said second telecommunications network from said first telecommunications network, wherein said first telecommunications network is currently providing radio access to said mobile station and said request for call control instruction is associated with a request for outgoing call connection from said mobile station towards a particular called party number; instructing said first telecommunications network to forward said received request for outgoing call connection to said second telecommunications network wherein said step of instructing further includes a particular internal routing number associated with the second telecommunications network and to be used by said first telecommunication network in forwarding said outgoing call connection; receiving said requested outgoing call connection from said first telecommunication network, said outgoing call connection including said particular internal routing number and said called party number; processing said requested outgoing call connection towards said particular called party by stripping said internal routing number from said called party number and generating said original called party number, said original called party number being the called party number as requested by said particular mobile station and thereby establishing a call connection between said mobile station and said called party through said second telecommunication network; and further providing said one or more subscriber features associated with said second telecommunications network to said mobile station traveling within geographic area covered by said first telecommunications network.