Patent ID: 6925299

Claim:
A system for providing a roaming subscriber with access to services available in a first telephone network via a voice connection, said subscriber roaming in a second telephone network, the system comprising: a first service node for association with said first mobile telephone network, a second service node for association with said second mobile telephone network, a packet-switch network for connecting said first service node with said second service node, said first and said second service nodes being configured to establish a signaling connection from said roaming mobile subscriber to a requested one of said services in said first mobile telephone network and to exchange signals required for said services between said first mobile network and said second telephone network via said packet switch network thereby to support said substantially seamless access, said signals comprising at least a subscriber identification signal to be transferred from said first telephone network to said second telephone network via said packet-switch network for reassociation with said voice connection whilst said voice connection is live.