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\title{SIP: Session Initiation Protocol -- Locating SIP Servers}
\author{Schulzrinne/Rosenberg}
\shorttitle{SIP}
\filename{draft-ietf-sip-srv-03}
\wg{SIP WG}
\expires{February 2002}
\address{Columbia U./dynamicsoft}
\pubdate{\today}
%\input{rfc}
\input{../defs}

\begin{document}
\maketitle

\begin{abstract}
This document describes how a SIP client locates a SIP server based on
the \header{Request-URI} or a preconfigured outbound proxy server.  This
document updates the process described in RFC 2543.
\end{abstract}

\section{Introduction}
\label{sec:intro}

This document updates Sections 1.3 and 1.4.2 and supersedes Appendix D
of RFC 2543 \cite{rfc2543}. Inter alia, it defines the term outbound
proxy and replaces references to the obsoleted RFC 2052 with current
references to RFC 2782.

\subsection{Terminology}
\label{sec:terminology}

In this document, the key words ``{\MUST}'', ``{\MUSTNOT}'',
``{\REQUIRED}'', ``{\SHALL}'', ``{\SHALLNOT}'', ``{\SHOULD}'',
``{\SHOULDNOT}'', ``{\RECOMMENDED}'', ``{\MAY}'', and ``{\OPTIONAL}''
are to be interpreted as described in RFC 2119 \cite{rfc2119} and
indicate requirement levels for compliant SIP implementations.

\subsection{Definitions}
\label{sec:definitions}

\begin{description}

\item[Outbound proxy:] A {\em proxy} that is located near the originator
of requests.  It receives all outgoing requests {\bf from} a particular
UAC, including those requests whose \header{Request-URL}s identify a
host other than the outbound proxy.  The outbound proxy sends these
requests, after any local processing, to the address indicated in the
\header{Request-URI}.  (All other proxy servers are simply referred as
proxies, not {\em inbound} proxies.)

\end{description}

\section{Locating a SIP Server}
\label{sec:server}

\input{lookup}

\section{Security Considerations}

The security considerations in RFC 2543 \cite{rfc2543} apply.

\section{Authors' Addresses}

\begin{flushleft}
Henning Schulzrinne\\
Dept. of Computer Science\\
Columbia University\\
1214 Amsterdam Avenue\\
New York, NY 10027\\
USA\\
electronic mail: {\sf schulzrinne@cs.columbia.edu}
\end{flushleft}

\begin{flushleft}
Jonathan Rosenberg\\
dynamicsoft\\
72 Eagle Rock Ave\\
East Hanover, NJ 07936\\
USA\\
electronic mail: {\sf jdrosen@dynamicsoft.com}
\end{flushleft}

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\input{../copyright}

\end{document}
