Abstract: The invention is a method of determining in at least one communication network if a session should be established in at least one communication network containing a plurality of session established entities, a method for determining if a session should be established with caller user equipment requesting the session, and in at least one communication network, a method for determining if a session should be established from caller user equipment at at least one communication network.

Abstract: A method of establishing a communication in a mobile communication system includes two steps. The mobile communication system includes a core network and at least one user equipment connected thereto via a radio access network. The method includes providing at least two types of domain for carrying a predetermined datastream for the communication in the core network. The method also includes providing one of the types of domain for carrying the predetermined datastream in the radio access network.

Abstract: The invention is a network and method for a client to request a named service in a network. The method includes transmitting a service request from the client in the network using a protocol in a layer in a protocol stack between a logical name of the named service and a physical address of a server, within a pool of servers in the network, which will provide the named service, to a service contact point of the network for the pool of servers; the service contact point, in response to the service request, selects the server which will provide the named service from the pool of servers; the service contact point forwards the request for the selected server to the selected server; and the selected server responds to the client with a message using the protocol indicating the selection of the selected server to the client.

Abstract: A method of limiting the media description negotiation in Mobile IP networks, comprising the steps of: filtering, by a proxy call state control means (P-CSCF), a media description list of a user equipment (UE; UE-O, UE-T) based on policy constraints of networks which are involved in a communication connection of said user equipment (UE; UE-O, UE-T); and establishing a communication connection of said user equipment (UE; UE-O, UE-T), wherein a media description list for said communication connection is negotiated by said proxy call state control means (P-CSCF).

Abstract: The invention is a method of determining in at least one communication network if a session should be established in at least one communication network containing a plurality of session established entities, a method for determining if a session should be established with caller user equipment requesting the session, and in at least one communication network, a method for determining if a session should be established from caller user equipment at at least one communication network.