A method of transmitting messages from a network node in a communication network to a first user device wherein the network node transmits to a second user device a message-waiting notification, identifying the first user device and optionally identifying a node holding the message, and in response to that notification, the second user device transmits a connection request to the first user device, said connection request being acted on by said first user device to establish a connection, optionally with the identified node, whereby said message can be transmitted to said first user device.