Telefonaktiebolaget Lm Ericsson (publ)

Andreas Lindqvist

Timo Forsman

Jonas Falkenå

Ester Gonzalez De Langarica

Srikanth Vavilapalli

System, methods, nodes, and instruction set for routing a session invitation from a first network () to a second network () are described. The first network () and the second network () are interconnected via at least two points of interconnect (). A first control node () receives a session invitation to a first user equipment (), both are part of the first network (). The first control node () determines whether a breakout condition for routing of the session invitation to the second network () is fulfilled. If so, a second control node () of the first network () selects a point of interconnect () to the second network (), considering a capability information characterizing the first control node (). Therefore the session invitation may be routed in an efficient way from the first network () to the second network ().

Routing of sessions to other communication networks

There is provided a method of operating an IP Multimedia Subsystem Access Gateway (IMS-AGW) in order to support the transmission of media to and from an endpoint, using an IMS, wherein the endpoint implements an alternative media transport protocol other than Real-time Transport Protocol (RTP). The method comprises the IMS-AGW receiving instructions from an IMS Application Level Gateway (IMS-ALG) for an alternative media transport protocol connection with the endpoint and a RTP connection within the IMS, the instructions including more than one RTP payload type number and a dynamic binding of each of the more than one RTP payload type number to a statically defined codec identifier. The IMS-AGW stores the dynamic binding. Then, when translating between alternative media transport protocol packets and RTP packets, the IMS-AGW uses the stored binding to map between an RTP payload type number and a codec identifier used by the alternative media transport protocol.

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Stockholm, Sweden

Andreas Lindqvist