Patent ID: 8249076

Claim:
A machine-implemented method operative in or in association with a signaling path between given entities that are attempting to set up a media session via transfer of signaling messages that conform to the Session Description Protocol (SDP), wherein the given entities are compliant with the Session Initiation Protocol (SIP), comprising: deriving, from the signaling messages, a negotiated set of one or more negotiated attributes of an expected media session negotiated by the given entities; inferring, from the signaling messages and from semantics of another protocol underlying the SIP, an inferred set of one or more non-negotiated attributes of the expected media session; during the actual media session, determining whether the negotiated set and the inferred set of one or more non-negotiated attributes correspond to given attributes of the actual media session negotiated by the given entities; and if the negotiated set and the inferred set of one or more non-negotiated attributes do not correspond to given attributes of the actual media session, taking an administratively-defined action.