1 Introduction

  • Article

This document specifies proprietary software application extensions for implementing call routing functionality to the Session Initiation Protocol (SIP). SIP is used by applications to establish, modify, and terminate multimedia sessions or calls.

The extensions discussed in this protocol are used by SIP clients, proxies, and servers.

Sections 1.5, 1.8, 1.9, 2, and 3 of this specification are normative. All other sections and examples in this specification are informative.