Abstract: Systems, apparatuses and methods for changing an address during a session between at least two network nodes is described, wherein at least one network node is able to change its address, comprising associating the session with a network routing entity performing group-based routing, changing the address of at least one of the network nodes, sending a address change request from the at least one network node having changed its address to the network routing entity, and forwarding the address change request to the at least one other network node involved in the session.

Abstract: A system and method for deciding in which context a DNS name should be resolved. A SIP server implements presence functionality for use in context discovery of a DNS name. When the terminal is aware of the context to which the DNS name is related, the terminal may perform a correct DNS lookup for the specific DNS name and context. The DNS resolve library may be modified with the context for the DNS name.