NETWORK ENTITY FOR INTERCONNECTING SIP END-POINTS OF DIFFERENT CAPABILITIES

摘要

There is described a Session initiation Protocol (SIP) network entity (3) for oeprating in a communications channel between a first SIP end point (1) and a second SIP end point (2) in a communication network.The first SIP end point (1) has available a first set of communication features and the second SIP end point (2) has available a second set of communication features, including at least one communication feature, for example Music on Hold, that is unavailable to the first SIP end point (1). The network entity (3) comprises means for acting as a client application for the first SIP end point (1) and as a server application for the second SIP end point (2) and is arranged to exchange signalling information with the SIP end points to enable the second SIP end point (2) to utilise the at least one communication feature during communications with the first SIP end point (1).