A method of providing a continuity control function (30) comprising: providing a signaling anchor point in a multimedia subsystem (12) for a first access signaling leg and a remote access signaling leg for a call between a user element (16) and a remote end point (36), the first access signaling leg provided for the user element by an outgoing transfer subsystem; establishing a second access signaling segment towards a user element by means of an entry transfer subsystem; replacing the first access signaling section with the second access signaling section, such that the second access signaling section is anchored at the signaling anchor point; and providing call signaling via the second access signaling leg and the remote signaling leg to transfer at least a part of a bearer path connected to the user element (16) from a first network to a second network; characterized in that: when the call terminates at the user element (16), the continuity control function (30) is invoked as the last service in a chain of services associated with the call, such that all services associated with The call other than the continuity control function (30) are anchored by the continuity control function (30) as part of the remote signaling leg of the call.