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4.2.2 Session Initiation Protocol (SIP) Extensions

Session Initiation Protocol Extensions, as specified in [MS-SIP] is an extension of the public standard Session Initiation Protocol (SIP), as specified in [RFC3261]. SIP is used to establish, modify and terminate multimedia sessions or calls. Microsoft has extended SIP in a number of areas, including authentication, presence reporting, and subscription management.

SIP messages can be used with transport used by SIP. This protocol defines a new format for the Presence Document.

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