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1 Introduction

This document describes Microsoft extensions to the Session Initiation Protocol (SIP). SIP is used by terminals to establish, modify, and terminate multimedia sessions or calls. SIP is specified in [RFC3261], [RFC3262], [RFC3263], and [RFC3863].

Microsoft has added extensions for NTLM/Kerberos Authentication, for presence, for optimization of subscriptions, and for notifications and contact management. These extensions are used by Microsoft Windows® Messenger and the Real-Time Communications (RTC) Client API.

Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in RFC 2119. Sections 1.5 and 1.9 are also normative but cannot contain those terms. All other sections and examples in this specification are informative.

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