Changing a first subscriber identifier to a second identifier

A method of connecting a message received from a network with a particular subscriber to a server, providing the server service through the network to subscribers who have ordered the service, the method comprising the following steps: identify the subscriber on the network and in messages to be sent from the network with a first identifier and the server with a second identifier, receiving (3-1, 4-1) a first message to be transferred to the server that includes the first subscriber identifier characterized by changing (3-3, 4-6) the first identifier in the first message to a second identifier before transferring the first message to the server.