Patent ID: 8442038

Claim:
A method for setting up a connection in a second network from a first user terminal to a second user terminal, when a connection in a first network is ongoing between the first user terminal and at least the second user terminal, and the first user terminal does not know a second network identity of the second user terminal, the method comprising: initiating the connection in the second network by the first user terminal, wherein the first user terminal sends an invitation to a context dependent second network address of a network unit providing a combinational service in the second network, the invitation including a second network identity of the first user terminal; interrogating a common part unit by the network unit providing the combinational service in the second network to retrieve the first network identity of the first user terminal, wherein the common part unit is accessible by both the first network and the second network, and the network unit interrogates the common part unit utilizing the second network identity of the first user terminal; interrogating a node handling the connection in the first network by the network unit providing the combinational service in the second network to retrieve the first network identity of the second user terminal involved in the ongoing connection with the first user terminal in the first network, wherein the network unit interrogates the node in the first network utilizing the first network identity of the first user terminal; interrogating the common part unit by the network unit providing the combinational service in the second network to retrieve the second network identity of the second user terminal, wherein the network unit interrogates the common part unit utilizing the first network identity of the second user terminal; and setting up the connection in the second network using the second network identity of the second terminal.