Management of a call between a calling party that is a mobile terminal in a first cellular network and a called party that is a mobile terminal in a second cellular network is provided by: receiving at an Application Server, AS, of the first cellular network a request to establish a call with the called party from the calling party, the called party being identified in the indication by a circuit-switched identifier; identifying a registration for the called party in the first cellular network using the circuit-switched identifier for the called party, the registration providing a packet-switched identifier for the called party; and setting up a call between the calling party and the called party of the first cellular network by initiating a packet-switched connection from the AS in the first cellular network to the called party in the second cellular network using the packet-switched identifier for the called party.