The invention relates to a method for performing inter-system handovers in
a communication system comprising at least a mobile station, a call state
control function, a first and a second call control node, a first and a
second media gateway and a radio network node. The handover is achieved
by way of connecting a call control node to a call state control
function. The call control node allocates a media gateway for the session
established. The session media bearers are routed via the media gateway.
The call control node acts as an anchor node for the handover. As the
mobile station moves to a new cell a media bearer is established to the
media gateway from the mobile station via the new cell.