Apparatus, method and computer program for seamless session transfer

An intermediate communication node in an Internet Protocol Multimedia Subsystem (IMS) network for controlling communication services between an application server and a plurality of client terminals in the IMS network, said intermediate communication node comprising:

• a communication interface configured to establish communication sessions between the application server and the plurality of client terminals;
• and
• a network part of an IMS client, wherein the network part resides in the intermediate communication node and a client part of the IMS client resides in each of the plurality of client terminals;
• wherein the network part of the IMS client is configured to establish an information interface with each client part, and is configured to utilize the information interfaces to obtain information from the client parts regarding which client parts are active, capabilities of each client part, and what types of communication sessions the IMS network has established with each client part;
• wherein the intermediate communication node is configured to transfer communication sessions between client terminals and to utilize the information obtained from the client parts to dynamically renegotiate services when service characteristics change.