Method and apparatus in a telecommunications network

A call session control node for a packet-switched telecommunications network, the call session control node comprising:

• an originating call handling function configured to receive a message for a called entity;
• processing circuitry configured to determine whether the called entity is registered with the call session control node;
• and
• a terminating call handling function;
• wherein when it is determined that the called entity is an entity registered with the call session control node, the terminating call handling function being configured to receive the message routed from the originating call handling function without traversing an inbound call session control function;
• wherein when it is determined that the called entity is not registered with the call session control node, the originating call handling function being configured to forward the message to an inbound call session control function, and the terminating call handling function being configured to receive the message from the inbound call session control function, and wherein the called entity is at least temporarily registered with the call session control node.