- SIP introduction added as a part of the ser documentation.

doc/sip/figures/bye.eps

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doc/sip/figures/redirect.eps

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+%%CreationDate: Tue Jul 15 14:59:36 2003
+%%For: janakj
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doc/sip/sip_introduction.sgml

@@ -0,0 +1,1026 @@
+<!-- $Id$ -->
+<!DOCTYPE Book PUBLIC "-//OASIS//DTD DocBook V4.2//EN" [
+
+<!-- Include general SER documentation entities -->
+<!ENTITY % serentities SYSTEM "../ser_entities.sgml">
+%serentities;
+
+]>
+
+<book>
+    <bookinfo>
+	<title>&sip; Introduction</title>
+	<authorgroup>
+	    <author>
+		<firstname>Jan</firstname>
+		<surname>Janak</surname>
+		<email>[email protected]</email>
+	    </author>
+	</authorgroup>
+	<copyright>
+	    <year>2003</year>
+	    <holder>FhG FOKUS</holder>
+	</copyright>
+	<abstract>
+	    <para>
+		A brief overview of SIP describing all important aspects of the Session Initiation
+		Protocol.
+	    </para>
+	</abstract>
+    </bookinfo>
+    <toc></toc>
+
+    <chapter>
+	<title>&sip; Introduction</title>
+	<section id="sec-purpose-of-sip">
+	    <title>Purpose of &sip;</title>
+	    <simpara>
+		&sip; stands for Session Initiation Protocol. It is an application-layer control
+		protocol which has been developed and designed within the &ietf;. The protocol has
+		been designed with easy implementation, good scalability, and flexibility in mind.
+	    </simpara>
+	    <simpara>
+		The specification is available in form of several <abbrev>RFCs</abbrev>, the most
+		important one is &rfc3261; which contains the core protocol specification. The
+		protocol is used for creating, modifying, and terminating sessions with one or more
+		participants. By sessions we understand a set of senders and receivers that
+		communicate and the state kept in those senders and receivers during the
+		communication. Examples of a session can include Internet telephone calls,
+		distribution of multimedia, multimedia conferences, distributed computer games, etc.
+	    </simpara>
+	    <simpara>
+		&sip; is not the only protocol that the communicating devices will need. It is not
+		meant to be a general purpose protocol. Purpose of &sip; is just to make the
+		communication possible, the communication itself must be achieved by another means
+		(and possibly another protocol). Two protocols that are most often used along with
+		&sip; are &rtp; and &sdp;. &rtp; protocol is used to carry the real-time multimedia
+		data (including audio, video, and text), the protocol makes it possible to encode
+		and split the data into packets and transport such packets over the
+		Internet. Another important protocol is &sdp;, which is used to describe and encode
+		capabilities of session participants. Such a description is then used to negotiate
+		the characteristics of the session so that all the devices can participate (that
+		includes, for example, negotiation of codecs used to encode media so all the
+		participants will be able to decode it, negotiation of transport protocol used and
+		so on).
+	    </simpara>
+	    <simpara>
+		&sip; has been designed in conformance with the Internet model. It is an end-to-end
+		oriented signalling protocol which means, that all the logic is stored in end
+		devices (except routing of &sip; messages). State is also stored in end-devices
+		only, there is no single point of failure and networks designed this way scale
+		well. The price that we have to pay for the distributiveness and scalability is
+		higher message overhead, caused by the messages being sent end-to-end.
+	    </simpara>
+	    <simpara>
+		It is worth of mentioning that the end-to-end concept of &sip; is a significant
+		divergence from regular &pstn; (Public Switched Telephone Network) where all the
+		state and logic is stored in the network and end devices (telephones) are very
+		primitive. Aim of &sip; is to provide the same functionality that the traditional
+		&pstn;s have, but the end-to-end design makes &sip; networks much more powerful and
+		open to the implementation of new services that can be hardly implemented in the
+		traditional &pstn;s.
+	    </simpara>
+	    <simpara>
+		&sip; is based on &http; protocol. The &http; protocol inherited format of message
+		headers from &rfc822;. &http; is probably the most successful and widely used
+		protocol in the Internet. It tries to combine the best of the both. In fact, &http;
+		can be classified as a signalling protocol too, because user agents use the protocol
+		to tell a &http; server in which documents they are interested in. &sip; is used to
+		carry the description of session parameters, the description is encoded into a
+		document using &sdp;. Both protocols (&http; and &sip;) have inherited encoding of
+		message headers from &rfc822;. The encoding has proven to be robust and flexible
+		over the years.
+	    </simpara>
+	</section>
+	<section id="sec-sip-uri">
+	    <title>&sip; &uri;</title>
+	    <simpara>
+		&sip; entities are identified using &sip; &uri; (Uniform Resource Identifier). A
+		&sip; &uri; has form of sip:username@domain, for instance,
+		sip:[email protected]. As we can see, &sip; &uri; consists of username part and
+		domain name part delimited by @ (at) character. &sip; &uri;s are similar to
+		e-mail addresses, it is, for instance, possible to use the same &uri; for e-mail
+		and &sip; communication, such &uri;s are easy to remember.
+	    </simpara>
+	</section>
+	<section id="sec-sip-network-elements">
+	    <title>&sip; Network Elements</title>
+	    <simpara>
+		Although in the simplest configuration it is possible to use just two user agents
+		that send &sip; messages directly to each other, a typical &sip; network will
+		contain more than one type of &sip; elements. Basic &sip; elements are user agents,
+		proxies, registrars, and redirect servers. We will briefly describe them in this
+		section.
+	    </simpara>
+	    <simpara>
+		Note that the elements, as presented in this section, are often only logical
+		entities. It is often profitable to co-locate them together, for instance, to
+		increase the speed of processing, but that depends on a particular implementation
+		and configuration.
+	    </simpara>
+	    <section id="sec-user-agents">
+		<title>User Agents</title>
+		<simpara>
+		    Internet end points that use &sip; to find each other and to negotiate a session
+		    characteristics are called <emphasis>user agents</emphasis>. User agents
+		    usually, but not necessarily, reside on a user's computer in form of an
+		    application--this is currently the most widely used approach, but user agents
+		    can be also cellular phones, &pstn; gateways, <acronym>PDAs</acronym>, automated
+		    <acronym>IVR</acronym> systems and so on.
+		</simpara>
+		<simpara>
+		    User agents are often reffered to as <emphasis>User Agent Server</emphasis>
+		    (&uas;) and <emphasis>User Agent Client</emphasis> (&uac;). &uas; and &uac; are
+		    logical entities only, each user agent contains a &uac; and &uas;. &uac; is the
+		    part of the user agent that sends requests and receives responses. &uas; is the
+		    part of the user agent that receives requests and sends responses.
+		</simpara>
+		<simpara>
+		    Because a user agent contains both &uac; and &uas;, we often say that a user
+		    agent behaves like a &uac; or &uas;. For instance, caller's user agent behaves
+		    like &uac; when it sends an INVITE requests and receives responses to the
+		    request. Callee's user agent behaves like a &uas; when it receives the INVITE
+		    and sends responses.
+		</simpara>
+		<simpara>
+		    But this situation changes when the callee decides to send a BYE and terminate
+		    the session. In this case the callee's user agent (sending BYE) behaves like
+		    &uac; and the caller's user agent behaves like &uas;.
+		</simpara>
+		<figure id="fig-ua" float="0">
+		    <title>&uac; and &uas;</title>		    
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/ua.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/ua.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Picture showing &uac; and &uas;</phrase>
+			</textobject>
+		    </mediaobject>
+		</figure>
+		<simpara>
+		    <xref linkend="fig-ua"> shows three user agents and one stateful forking
+		    proxy. Each user agent contains &uac; and &uas;. The part of the proxy that
+		    receives the INVITE from the caller in fact acts as a &uas;. When forwarding the
+		    request statefully the proxy creates two &uac;s, each of them is responsible for
+		    one branch.
+		</simpara>
+		<simpara>
+		    In our example callee B picked up and later when he wants to tear down the call
+		    it sends a BYE. At this time the user agent that was previously &uas; becomes a
+		    &uac; and vice versa.
+		</simpara>
+	    </section>
+	    <section id="sec-proxy-servers">
+		<title>Proxy Servers</title>
+		<simpara>
+		    In addition to that &sip; allows creation of an infrastructure of network hosts
+		    called <emphasis>proxy servers</emphasis>. User agents can send messages to a
+		    proxy server. Proxy servers are very important entities in the &sip;
+		    infrastructure. They perform routing of a session invitations according to
+		    invitee's current location, authentication, accounting and many other important
+		    functions.
+		</simpara>
+		<simpara>
+		    The most important task of a proxy server is to route session invitations
+		    <quote>closer</quote> to callee. The session invitation will usually traverse a
+		    set of proxies until it finds one which knows the actual location of the
+		    callee. Such a proxy will forward the session invitation directly to the callee
+		    and the callee will then accept or decline the session invitation.
+		</simpara>
+		<simpara>
+		    There are two basic types of &sip; proxy servers--stateless and stateful.
+		</simpara>
+
+		<section id="sec-stateless-servers">
+		    <title>Stateless Servers</title>
+		    <simpara>
+			Stateless server are simple message forwarders. They forward messages
+			independently of each other. Although messages are usually arranged into
+			transactions (see <xref linkend="sec-sip-transactions">), stateless proxies
+			do not take care of transactions.
+		    </simpara>
+		    <simpara>
+			Stateless proxies are simple, but faster than stateful proxy servers. They
+			can be used as simple load balancers, message translators and routers. One
+			of drawbacks of stateless proxies is that they are unable to absorb
+			retransmissions of messages and perform more advanced routing, for instance,
+			forking or recursive traversal.
+		    </simpara>
+		</section>
+		<section id="sec-stateful-servers">
+		    <title>Stateful Servers</title>
+		    <simpara>
+			Stateful proxies are more complex. Upon reception of a request, stateful
+			proxies create a state and keep the state until the transaction
+			finishes. Some transactions, especially those created by INVITE, can last
+			quite long (until callee picks up or declines the call). Because stateful
+			proxies must maintain the state for the duration of the transactions, their
+			performance is limited.
+		    </simpara>
+		    <simpara>
+			The ability to associate &sip; messages into transactions gives stateful
+			proxies some interesting features. Stateful proxies can perform forking,
+			that means upon reception of a message two or more messages will be sent
+			out.
+		    </simpara>
+		    <simpara>
+			Stateful proxies can absorb retransmissions because they know, from the
+			transaction state, if they have already received the same message (stateless
+			proxies cannot do the check because they keep no state).
+		    </simpara>
+		    <simpara>
+			Stateful proxies can perform more complicated methods of finding a user. It
+			is, for instance, possible to try to reach user's office phone and when he
+			doesn't pick up then the call is redirected to his cell phone. Stateless
+			proxies can't do this because they have no way of knowing how the
+			transaction targeted to the office phone finished.
+		    </simpara>
+		    <simpara>
+			Most &sip; proxies today are stateful because their configuration is usually
+			very complex. They often perform accounting, forking, some sort of &nat;
+			traversal aid and all those features require a stateful proxy.
+		    </simpara>
+		</section>
+		<section id="sec-proxy-server-usage">
+		    <title>Proxy Server Usage</title>
+		    <simpara>
+			A typical configuration is that each centrally administered entity (a
+			company, for instance) has it's own &sip; proxy server which is used by all
+			user agents in the entity. Let's suppose that there are two companies A and
+			B and each of them has it's own proxy server. <xref linkend="fig-companies">
+			shows how a session invitation from employee Joe in company A will reach
+			employee Bob in company B.
+		    </simpara>
+		    <figure id="fig-companies" float="0">
+			<title>Session Invitation</title>
+			<mediaobject>
+			    <imageobject>
+				<imagedata align="center" scale="40" fileref="figures/companies.eps" format="EPS">
+			    </imageobject>
+			    <imageobject>
+				<imagedata align="center" fileref="figures/companies.png" format="PNG">
+			    </imageobject>
+			    <textobject>
+				<phrase>Picture showing a session invitation message flow</phrase>
+			    </textobject>
+			</mediaobject> 
+		    </figure>
+		    <simpara>
+			User Joe uses address sip:[email protected] to call Bob. Joe's user agent doesn't
+			know how to route the invitation itself but it is configured to send all
+			outbound traffic to the company &sip; proxy server proxy.a.com. The proxy
+			server figures out that user sip:[email protected] is in a different company so it
+			will look up B's &sip; proxy server and send the invitation there. B's proxy
+			server can be either preconfigured at proxy.a.com or the proxy will use
+			<acronym>DNS SRV</acronym> records to find B's proxy server. The invitation
+			reaches proxy.bo.com. The proxy knows that Bob is currently sitting in his
+			office and is reachable through phone on his desk, which has &ip; address
+			1.2.3.4, so the proxy will send the invitation there.
+		    </simpara>
+		</section>
+	    </section>
+	    <section id="sec-registrar">
+		<title>Registrar</title>
+		<simpara>
+		    We mentioned that the &sip; proxy at proxy.b.com knows current Bob's location
+		    but haven't mentioned yet how a proxy can learn current location of a
+		    user. Bob's user agent (&sip; phone) must register with a
+		    <emphasis>registrar</emphasis>. The registrar is a special &sip; entity that
+		    receives registrations from users, extracts information about their current
+		    location (&ip; address, port and username in this case) and stores the
+		    information into location database. Purpose of the location database is to map
+		    sip:[email protected] to something like sip:[email protected]:5060. The location database is
+		    then used by B's proxy server. When the proxy receives an invitation for
+		    sip:[email protected] it will search the location database. It finds
+		    sip:[email protected]:5060 and will send the invitation there. A registrar is very
+		    often a logical entity only. Because of their tight coupling with proxies
+		    registrars, are usually co-located with proxy servers.
+		</simpara>
+		<simpara>
+		    <xref linkend="fig-registrar"> shows a typical &sip; registration. A REGISTER
+		    message containing Address of Record sip:[email protected] and contact address
+		    sip:[email protected]:5060 where 1.2.3.4 is &ip; address of the phone, is sent to the
+		    registrar. The registrar extracts this information and stores it into the
+		    location database. If everything went well then the registrar sends a 200 OK
+		    response to the phone and the process of registration is finished.
+		</simpara>
+		<figure id="fig-registrar" float="0">
+		    <title>Registrar Overview</title>
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/registrar.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/registrar.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Picture showing a typical registrar</phrase>
+			</textobject>
+		    </mediaobject> 
+		</figure>
+		<simpara>
+		    Each registration has a limited lifespan. Expires header field or expires
+		    parameter of Contact header field determines for how long is the registration
+		    valid. The user agent must refresh the registration within the lifespan
+		    otherwise it will expire and the user will become unavailable.
+		</simpara>
+	    </section>
+	    <section id="sec-redirect-server">
+		<title>Redirect Server</title>
+		<simpara>
+		    The entity that receives a request and sends back a reply containing a list of the
+		    current location of a particular user is called <emphasis>redirect server</emphasis>. A
+		    redirect server receives requests and looks up the intended recipient of the request in
+		    the location database created by a registrar. It then creates a list of current
+		    locations of the user and sends it to the request originator in a response within 3xx
+		    class.
+		</simpara>
+		<simpara>
+		    The originator of the request then extracts the list of destinations and sends
+		    another request directly to them. <xref linkend="fig-redirect"> shows a typical
+		    redirection.
+		</simpara>
+		<figure id="fig-redirect" float="0">
+		    <title>SIP Redirection</title>
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/redirect.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/redirect.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Picture showing a redirection</phrase>
+			</textobject>
+		    </mediaobject> 
+		</figure>
+	    </section>
+	</section>
+	<section id="sec-sip-messages">
+	    <title>SIP Messages</title>
+	    <simpara>
+		Communication using &sip; (often called signalling) comprises of series of
+		<emphasis>messages</emphasis>. Messages can be transported independently by the
+		network. Usually they are transported in a separate &udp; datagram each. Each
+		message consist of <quote>first line</quote>, message header, and message body. The
+		first line identifies type of the message. There are two types of
+		messages--<emphasis>requests</emphasis> and <emphasis>responses</emphasis>.
+		Requests are usually used to initiate some action or inform recipient of the request
+		of something. Replies are used to confirm that a request was received and processed
+		and contain the status of the processing.
+	    </simpara>
+	    <simpara>
+		A typical &sip; request looks like this:
+	    </simpara>
+	<programlisting format="linespecific">
+INVITE sip:[email protected] SIP/2.0
+Via: SIP/2.0/UDP 195.37.77.100:5040;rport
+Max-Forwards: 10
+From: "jiri" &lt;sip:[email protected]&gt;;tag=76ff7a07-c091-4192-84a0-d56e91fe104f
+To: &lt;sip:[email protected]&gt;
+Call-ID: [email protected]
+CSeq: 2 INVITE
+Contact: &lt;sip:213.20.128.35:9315&gt;
+User-Agent: Windows RTC/1.0
+Proxy-Authorization: Digest username="jiri", realm="iptel.org", 
+  algorithm="MD5", uri="sip:[email protected]", 
+  nonce="3cef753900000001771328f5ae1b8b7f0d742da1feb5753c", 
+  response="53fe98db10e1074
+b03b3e06438bda70f"
+Content-Type: application/sdp
+Content-Length: 451
+
+v=0
+o=jku2 0 0 IN IP4 213.20.128.35
+s=session
+c=IN IP4 213.20.128.35
+b=CT:1000
+t=0 0
+m=audio 54742 RTP/AVP 97 111 112 6 0 8 4 5 3 101
+a=rtpmap:97 red/8000
+a=rtpmap:111 SIREN/16000
+a=fmtp:111 bitrate=16000
+a=rtpmap:112 G7221/16000
+a=fmtp:112 bitrate=24000
+a=rtpmap:6 DVI4/16000
+a=rtpmap:0 PCMU/8000
+a=rtpmap:4 G723/8000
+a=rtpmap: 3 GSM/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-16
+</programlisting>
+	    <simpara>
+		The first line tells us that this is INVITE message which is used to establish a
+		session. The &uri; on the first line--sip:[email protected] is called <emphasis>Request
+		&uri;</emphasis> and contains &uri; of the next hop of the message. In this case it
+		will be host iptel.org.
+	    </simpara>
+	    <simpara>
+		A &sip; request can contain one or more Via header fields which are used to record
+		path of the request. They are later used to route &sip; responses exactly the same
+		way. The INVITE message contains just one Via header field which was created by the
+		user agent that sent the request. From the Via field we can tell that the user agent
+		is running on host 195.37.77.100 and port 5060.
+	    </simpara>
+	    <simpara>
+		From and To header fields identify initiator (caller) and recipient (callee) of the
+		invitation (just like in &smtp; where they identify sender and recipient of a
+		message). From header field contains a tag parameter which serves as a dialog
+		identifier and will be described in <xref linkend="sec-sip-dialogs">.
+	    </simpara>
+	    <simpara>
+		Call-ID header field is a dialog identifier and it's purpose is to identify messages
+		belonging to the same call. Such messages have the same Call-ID identifier. CSeq is
+		used to maintain order of requests. Because requests can be sent over an unreliable
+		transport that can re-order messages, a sequence number must be present in the
+		messages so that recipient can identify retransmissions and out of order requests.
+	    </simpara>
+	    <simpara>
+		Contact header field contains &ip; aaddress and port on which the sender is awaiting
+		further requests sent by callee. Other header fields are not important and will be
+		not described here.
+	    </simpara>
+	    <simpara>
+		Message header is delimited from message body by an empty line. Message body of the INVITE
+		request contains a description of the media type accepted by the sender and encoded in
+		&sdp;.
+	    </simpara>
+	    <section id="sec-sip-requests">
+		<title>SIP Requests</title>
+		<simpara>
+		    We have described how an INVITE request looks like and said that the request is
+		    used to invite a callee to a session. Other important requests are:
+		</simpara>
+		<itemizedlist>
+		    <listitem>
+			<simpara>
+			    <emphasis>ACK</emphasis>--This message acknowledges receipt of a final
+			    response to INVITE. Establishing of a session utilizes 3-way
+			    hand-shaking due to asymmetric nature of the invitation. It may take a
+			    while before the callee accepts or declines the call so the callee's
+			    user agent periodically retransmits a positive final response until it
+			    receives an ACK (which indicates that the caller is still there and
+			    ready to communicate).
+			</simpara>
+		    </listitem>
+		    <listitem>
+			<simpara>
+			    <emphasis>BYE</emphasis>--Bye messages are used to tear down multimedia
+			    sessions. A party wishing to tear down a session sends a BYE to the
+			    other party.
+			</simpara>
+		    </listitem>
+		    <listitem>
+			<simpara>
+			    <emphasis>CANCEL</emphasis>--Cancel is used to cancel not yet fully
+			    established session. It is used when the callee hasn't replied with a
+			    final response yet but the caller wants to abort the call (typically
+			    when a callee doesn't respond for some time).
+			</simpara>
+		    </listitem>
+		    <listitem>
+			<simpara>
+			    <emphasis>REGISTER</emphasis>--Purpose of REGISTER request is to let
+			    registrar know of current user's location. Information about current
+			    &ip; address and port on which a user can be reached is carried in
+			    REGISTER messages. Registrar extracts this information and puts it into
+			    a location database. The database can be later used by &sip; proxy
+			    servers to route calls to the user. Registrations are time-limited and
+			    need to be periodically refreshed.
+			</simpara>
+		    </listitem>
+		</itemizedlist>
+		<simpara>
+		    The listed requests usually have no message body because it is not needed in
+		    most situations (but can have one). In addition to that many other request types
+		    have been defined but their description is out of the scope of this document.
+		</simpara>
+	    </section>
+	    <section id="sec-sip-responses">
+		<title>SIP Responses</title>
+		<simpara>
+		    When a user agent or proxy server receives a request it send a reply. Each
+		    request must be replied except ACK requests which trigger no replies.
+		</simpara>
+		<simpara>
+		    A typical reply looks like this:
+		</simpara>
+		<programlisting format="linespecific">
+SIP/2.0 200 OK
+Via: SIP/2.0/UDP 192.168.1.30:5060;received=66.87.48.68
+From: sip:[email protected]
+To: sip:[email protected];tag=794fe65c16edfdf45da4fc39a5d2867c.b713
+Call-ID: [email protected]
+CSeq: 63629 REGISTER
+Contact: &lt;sip:[email protected]:5060;transport=udp&gt;;q=0.00;expires=120
+Server: Sip EXpress router (0.8.11pre21xrc (i386/linux))
+Content-Length: 0
+Warning: 392 195.37.77.101:5060 "Noisy feedback tells:  
+    pid=5110 req_src_ip=66.87.48.68 req_src_port=5060 in_uri=sip:iptel.org 
+    out_uri=sip:iptel.org via_cnt==1"
+</programlisting>
+		<simpara>
+		    As we can see, responses are very similar to the requests, except for the first
+		    line. The first line of response contains protocol version (SIP/2.0), reply
+		    code, and reason phrase.
+		</simpara>
+		<simpara>
+		    The <emphasis>reply code</emphasis> is an integer number from 100 to 699 and
+		    indicates type of the response. There are 6 classes of responses:
+		</simpara>
+		<itemizedlist>
+		    <listitem>
+			<simpara>
+			    <emphasis>1xx</emphasis> are <emphasis>provisional</emphasis>
+			    responses. A provisional response is response that tells to its
+			    recipient that the associated request was received but result of the
+			    processing is not known yet. Provisional responses are sent only when
+			    the processing doesn't finish immediately. The sender must stop
+			    retransmitting the request upon reception of a provisional response.
+			</simpara>
+			<simpara>
+			    Typically proxy servers send responses with code 100 when they start
+			    processing an INVITE and user agents send responses with code 180
+			    (Ringing) which means that the callee's phone is ringing.
+			</simpara>
+		    </listitem>
+		    <listitem>
+			<simpara>
+			    <emphasis>2xx</emphasis> responses are <emphasis>positive
+			    final</emphasis> responses. A final response is the ultimate response
+			    that the originator of the request will ever receive. Therefore final
+			    responses express result of the processing of the associated
+			    request. Final responses also terminate transactions. Responses with
+			    code from 200 to 299 are positive responses that means that the request
+			    was processed successfully and accepted. For instance a 200 OK response
+			    is sent when a user accepts invitation to a session (INVITE request).
+			</simpara>
+			<simpara>
+			    A &uac; may receive several 200 messages to a single INVITE
+			    request. This is because a forking proxy (described later) can fork the
+			    request so it will reach several &uas; and each of them will accept the
+			    invitation. In this case each response is distinguished by the tag
+			    parameter in To header field. Each response represents a distinct dialog
+			    with unambiguous dialog identifier.
+			</simpara>
+		    </listitem>
+		    <listitem>
+			<simpara>
+			    <emphasis>3xx</emphasis> responses are used to redirect a caller. A
+			    redirection response gives information about the user's new location or
+			    an alternative service that the caller might use to satisfy the
+			    call. Redirection responses are usually sent by proxy servers. When a
+			    proxy receives a request and doesn't want or can't process it for any
+			    reason, it will send a redirection response to the caller and put
+			    another location into the response which the caller might want to
+			    try. It can be the location of another proxy or the current location of
+			    the callee (from the location database created by a registrar). The
+			    caller is then supposed to re-send the request to the new location. 3xx
+			    responses are final.
+			</simpara>
+		    </listitem>
+		    <listitem>
+			<simpara>
+			    <emphasis>4xx</emphasis> are <emphasis>negative final</emphasis>
+			    responses. a 4xx response means that the problem is on the sender's
+			    side. The request couldn't be processed because it contains bad syntax
+			    or cannot be fulfilled at that server.
+			</simpara>
+		    </listitem>
+		    <listitem>
+			<simpara>
+			    <emphasis>5xx</emphasis> means that the problem is on server's side. The
+			    request is apparently valid but the server failed to fulfill it. Clients
+			    should usually retry the request later.
+			</simpara>
+		    </listitem>
+		    <listitem>
+			<simpara>
+			    <emphasis>6xx</emphasis> reply code means that the request cannot be
+			    fulfilled at any server. This response is usually sent by a server that
+			    has definitive information about a particular user. User agents usually
+			    send a 603 Decline response when the user doesn't want to participate in
+			    the session.
+			</simpara>
+		    </listitem>
+		</itemizedlist>
+		<simpara>
+		    In addition to the response class the first line also contains <emphasis>reason
+			phrase</emphasis>. The code number is intended to be processed by
+		    machines. It is not very human-friendly but it is very easy to parse and
+		    understand by machines. The reason phrase usually contains a human-readable
+		    message describing the result of the processing. A user agent should render
+		    the reason phrase to the user.
+		</simpara>
+		<simpara>
+		    The request to which a particular response belongs is identified using the CSeq
+		    header field. In addition to the sequence number this header field also contains
+		    method of corresponding request. In our example it was REGISTER request.
+		</simpara>
+	    </section>
+	</section> 
+	<section id="sec-sip-transactions">
+	    <title>&sip; Transactions</title>
+	    <simpara>
+		Although we said that &sip; messages are sent independently over the network, they
+		are usually arranged into <emphasis>transactions</emphasis> by user agents and
+		certain types of proxy servers. Therefore &sip; is said to be a
+		<emphasis>transactional protocol</emphasis>.
+	    </simpara>
+	    <simpara>
+		A transaction is a sequence of &sip; messages exchanged between &sip; network
+		elements. A transaction consists of one request and all responses to that
+		request. That includes zero or more provisional responses and one or more final
+		responses (remember that an INVITE might be answered by more than one final response
+		when a proxy server forks the request).
+	    </simpara>
+	    <simpara>
+		If a transaction was initiated by an INVITE request then the same transaction also
+		includes ACK, but only if the final response was not a 2xx response. If the final
+		response was a 2xx response then the ACK is not considered part of the transaction.
+	    </simpara>
+	    <simpara>
+		As we can see this is quite asymmetric behavior--ACK is part of transactions with a
+		negative final response but is not part of transactions with positive final
+		responses. The reason for this separation is the importance of delivery of all 200
+		OK messages. Not only that they establish a session, but also 200 OK can be
+		generated by multiple entities when a proxy server forks the request and all of them
+		must be delivered to the calling user agent. Therefore user agents take
+		responsibility in this case and retransmit 200 OK responses until they receive an
+		ACK. Also note that only responses to INVITE are retransmitted !
+	    </simpara>
+	    <simpara>
+		&sip; entities that have notion of transactions are called
+		<emphasis>stateful</emphasis>. Such entities usually create a state associated with
+		a transaction that is kept in the memory for the duration of the transaction. When a
+		request or response comes, a stateful entity tries to associate the request (or
+		response) to existing transactions. To be able to do it it must extract a unique
+		transaction identifier from the message and compare it to identifiers of all
+		existing transactions. If such a transaction exists then it's state gets updated
+		from the message.
+	    </simpara>
+	    <simpara>
+		In the previous &sip; &rfc2543; the transaction identifier was calculated as hash of
+		all important message header fields (that included To, From, Request-URI and
+		CSeq). This proved to be very slow and complex, during interoperability tests such
+		transaction identifiers used to be a common source of problems.
+	    </simpara>
+	    <simpara>
+		In the new &rfc3261; the way of calculating transaction identifiers was completely
+		changed. Instead of complicated hashing of important header fields a &sip; message now
+		includes the identifier directly. Branch parameter of Via header fields contains directly
+		the transaction identifier. This is significant simplification, but there still exist old
+		implementations that don't support the new way of calculating of transaction identifier so
+		even new implementations have to support the old way. They must be backwards compatible.
+	    </simpara>
+	    <simpara>
+		<xref linkend="fig-transactions"> shows what messages belong to what transactions
+		during a conversation of two user agents.
+	    </simpara>
+	    <figure id="fig-transactions" float="0">
+		<title>&sip; Transactions</title>
+		<mediaobject>
+		    <imageobject>
+			<imagedata align="center" scale="40" fileref="figures/transaction.eps" format="EPS">
+		    </imageobject>
+		    <imageobject>
+			<imagedata align="center" fileref="figures/transaction.png" format="PNG">
+		    </imageobject>
+		    <textobject>
+			<phrase>Message flow showing messages belonging to the same transaction.</phrase>
+		    </textobject>
+		</mediaobject>
+	    </figure>
+	</section>
+	<section id="sec-sip-dialogs">
+	    <title>&sip; Dialogs</title>
+	    <simpara>
+		We have shown what transactions are, that one transaction includes INVITE and it's
+		responses and another transaction includes BYE and it responses when a session is
+		being torn down. But we feel that those two transactions should be somehow
+		related--both of them belong to the same <emphasis>dialog</emphasis>. A dialog
+		represents a peer-to-peer &sip; relationship between two user agents. A dialog
+		persists for some time and it is very important concept for user agents. Dialogs
+		facilitate proper sequencing and routing of messages between &sip; endpoints.
+	    </simpara>
+	    <simpara>
+		Dialogs are identified using Call-ID, From tag, and To tag. Messages that have these
+		three identifiers same belong to the same dialog. We have shown that CSeq header
+		field is used to order messages, in fact it is used to order messages within a
+		dialog. The number must be monotonically increased for each message sent within a
+		dialog otherwise the peer will handle it as out of order request or
+		retransmission. In fact, the CSeq number identifies a transaction within a dialog
+		because we have said that requests and associated responses are called
+		transaction. This means that only one transaction in each direction can be active
+		within a dialog. One could also say that a <emphasis>dialog is a sequence of
+		transactions</emphasis>. <xref linkend="fig-dialog"> extends <xref
+		linkend="fig-transactions"> to show which messages belong to the same dialog.
+	    </simpara>
+	    <figure id="fig-dialog" float="0">
+		<title>SIP Dialog</title>
+		<mediaobject>
+		    <imageobject>
+			<imagedata align="center" scale="40" fileref="figures/dialog.eps" format="EPS">
+		    </imageobject>
+		    <imageobject>
+			<imagedata align="center" fileref="figures/dialog.png" format="PNG">
+		    </imageobject>
+		    <textobject>
+			<phrase>Message flow showing transactions belonging to the same dialog.</phrase>
+		    </textobject>
+		</mediaobject>
+	    </figure>
+	    <simpara>
+		Some messages establish a dialog and some do not. This allows to explicitly express
+		the relationship of messages and also to send messages that are not related to other
+		messages outside a dialog. That is easier to implement because user agent don't have
+		to keep the dialog state.
+	    </simpara>
+	    <simpara>
+		For instance, INVITE message establishes a dialog, because it will be later followed
+		by BYE request which will tear down the session established by the INVITE. This BYE
+		is sent within the dialog established by the INVITE.
+	    </simpara>
+	    <simpara>
+		But if a user agent sends a MESSAGE request, such a request doesn't establish any
+		dialog. Any subsequent messages (even MESSAGE) will be sent independently of the
+		previous one.
+	    </simpara>
+	    <section id="sec-dialogs-facilitate-routing">
+		<title>Dialogs Facilitate Routing</title>
+		<simpara>
+		    We have said that dialogs are also used to route the messages between user
+		    agents, let's describe this a little bit.
+		</simpara>
+		<simpara>
+		    Let's suppose that user sip:[email protected] wants to talk to user sip:[email protected]. He
+		    knows &sip; address of the callee (sip:[email protected]) but this address doesn't say
+		    anything about current location of the user--i.e. the caller doesn't know to
+		    which host to send the request. Therefore the INVITE request will be sent to a
+		    proxy server.
+		</simpara>
+		<simpara>
+		    The request will be sent from proxy to proxy until it reaches one that knows
+		    current location of the callee. This process is called routing. Once the request
+		    reaches the callee, the callee's user agent will create a response that will be
+		    sent back to the caller. Callee's user agent will also put Contact header field
+		    into the response which will contain the current location of the user. The
+		    original request also contained Contact header field which means that both user
+		    agents know the current location of the peer.
+		</simpara>
+		<simpara>
+		    Because the user agents know location of each other, it is not necessary to send
+		    further requests to any proxy--they can be sent directly from user agent to user
+		    agent. That's exactly how dialogs facilitate routing.
+		</simpara>
+		<simpara>
+		    Further messages within a dialog are sent directly from user agent to user
+		    agent. This is a significant performance improvement because proxies do not see
+		    all the messages within a dialog, they are used to route just the first request
+		    that establishes the dialog. The direct messages are also delivered with much
+		    smaller latency because a typical proxy usually implements complex routing
+		    logic. <xref linkend="fig-trapezoid"> contains an example of a message
+		    within a dialog (BYE) that bypasses the proxies.
+		</simpara>
+		<figure id="fig-trapezoid" float="0">
+		    <title>SIP Trapezoid</title>
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/trapezoid.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/trapezoid.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Message flow showing &sip trapezoid.</phrase>
+			</textobject>
+		    </mediaobject>
+		</figure>
+	    </section>
+	    <section id="sec-dialog-identifiers">
+		<title>Dialog Identifiers</title>
+		<simpara>
+		    We have already shown that dialog identifiers consist of three parts, Call-Id,
+		    From tag, and To tag, but it is not that clear why are dialog identifiers
+		    created exactly this way and who contributes which part.
+		</simpara>
+		<simpara>
+		    Call-ID is so called <emphasis>call identifier</emphasis>. It must be a unique
+		    string that identifies a call. A call consists of one or more dialogs. Multiple
+		    user agents may respond to a request when a proxy along the path forks the
+		    request. Each user agent that sends a 2xx establishes a separate dialog with the
+		    caller. All such dialogs are part of the same call and have the same Call-ID.
+		</simpara>
+		<simpara>
+		    From tag is generated by the caller and it uniquely identifies the dialog in the
+		    caller's user agent.
+		</simpara>
+		<simpara>
+		    To tag is generated by a callee and it uniquely identifies, just like From tag,
+		    the dialog in the callee's user agent.
+		</simpara>
+		<simpara>
+		    This hierarchical dialog identifier is necessary because a single call
+		    invitation can create several dialogs and caller must be able to distinguish
+		    them.
+		</simpara>
+	    </section>
+	</section>
+	<section id="sec-typical-sip-scenarios">
+	    <title>Typical &sip; Scenarios</title>
+	    <simpara>
+		This section gives a brief overview of typical &sip; scenarios that usually make up the
+		&sip; traffic.
+	    </simpara>
+	    <section id="sec-registration">
+		<title>Registration</title>
+		<simpara>
+		    Users must register themselves with a registrar to be reachable by other
+		    users. A registration comprises a REGISTER message followed by a 200 OK sent by
+		    registrar if the registration was successful. Registrations are usually
+		    authorized so a 407 reply can appear if the user didn't provide valid
+		    credentials. <xref linkend="fig-register"> shows an example of registration.
+		</simpara>
+		<figure id="fig-register" float="0">
+		    <title>REGISTER Message Flow</title>
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/register.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/register.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Message flow of a registration.</phrase>
+			</textobject>
+		    </mediaobject>
+		</figure>
+	    </section>
+	    <section id="sec-session-invitation">
+		<title>Session Invitation</title>
+		<simpara>
+		    A session invitation consists of one INVITE request which is usually sent to a
+		    proxy. The proxy sends immediately a 100 Trying reply to stop retransmissions
+		    and forwards the request further.
+		</simpara>
+		<simpara>
+		    All provisional responses generated by callee are sent back to the caller. See
+		    180 Ringing response in the call flow. The response is generated when callee's
+		    phone starts ringing.
+		</simpara>
+		<figure id="fig-invite1" float="0">
+		    <title>INVITE Message Flow</title>
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/invite1.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/invite1.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Picture showing a session invitation.</phrase>
+			</textobject>
+		    </mediaobject>
+		</figure>
+		<simpara>
+		    A 200 OK is generated once the callee picks up the phone and it is retransmitted
+		    by the callee's user agent until it receives an ACK from the caller. The session
+		    is established at this point.
+		</simpara>
+	    </section>
+	    <section id="sec-session-termination">
+		<title>Session Termination</title>
+		<simpara>
+		    Session termination is accomplished by sending a BYE request within dialog
+		    established bye INVITE. BYE messages are sent directly from one user agent to
+		    the other unless a proxy on the path of the INVITE request indicated that it
+		    wishes to stay on the path by using record routing (see <xref
+		    linkend="sec-record-routing">.
+		</simpara>
+		<simpara>
+		    Party wishing to tear down a session sends a BYE request to the other party
+		    involved in the session. The other party sends a 200 OK response to confirm the
+		    BYE and the session is terminated. See <xref linkend="fig-bye">, left message
+		    flow.
+		</simpara>
+	    </section>
+	    <section id="sec-record-routing">
+		<title>Record Routing</title>
+		<simpara>
+		    All requests sent within a dialog are by default sent directly from one user agent
+		    to the other. Only requests outside a dialog traverse &sip; proxies. This approach
+		    makes &sip; network more scalable because only a small number of &sip; messages hit
+		    the proxies.
+		</simpara>
+		<simpara>
+		    There are certain situations in which a &sip; proxy need to stay on the path of all
+		    further messages. For instance, proxies controlling a &nat; box or proxies doing
+		    accounting need to stay on the path of BYE requests.
+		</simpara>
+		<simpara>
+		    Mechanism by which a proxy can inform user agents that it wishes to stay on the path
+		    of all further messages is called <emphasis>record routing</emphasis>. Such a proxy
+		    would insert Record-Route header field into &sip; messages which contain address of
+		    the proxy. Messages sent within a dialog will then traverse all &sip; proxies that
+		    put a Record-Route header field into the message.
+		</simpara>
+		<simpara>
+		    The recipient of the request receives a set of Record-Route header fields in the
+		    message. It must mirror all the Record-Route header fields into responses because
+		    the originator of the request also needs to know the set of proxies.
+		</simpara>
+		<figure id="fig-bye" float="0">
+		    <title>BYE Message Flow (With and without Record Routing)</title>
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/bye.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/bye.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Picture showing BYE message flow with and without record routing.</phrase>
+			</textobject>
+		    </mediaobject>
+		</figure>
+		<simpara>
+		    Left message flow of <xref linkend="fig-bye"> show how a BYE (request
+		    within dialog established by INVITE) is sent directly to the other user agent
+		    when there is no Record-Route header field in the message. Right message flow
+		    show how the situation changes when the proxy puts a Record-Route header field
+		    into the message.
+		</simpara>
+	    </section>
+	    <section id="sec-event-subscription-and-notification">
+		<title>Event Subscription And Notification</title>
+		<simpara>
+		    The &sip; specification has been extended to support a general mechanism allowing
+		    subscription to asynchronous events. Such evens can include &sip; proxy statistics
+		    changes, presence information, session changes and so on.
+		</simpara>
+		<simpara>
+		    The mechanism is used mainly to convey information on presence (willingness to
+		    communicate) of users. <xref linkend="fig-event"> shows the basic message
+		    flow.
+		</simpara>
+		<figure id="fig-event" float="0">
+		    <title>Event Subscription And Notification</title>
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/event.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/event.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Picture showing subscription and notification.</phrase>
+			</textobject>
+		    </mediaobject>
+		</figure>
+		<simpara>
+		    A user agent interested in event notification sends a SUBSCRIBE message to a
+		    &sip; server. The SUBSCRIBE message establishes a dialog and is immediately
+		    replied by the server using 200 OK response. At this point the dialog is
+		    established. The server sends a NOTIFY request to the user every time the event
+		    to which the user subscribed changes. NOTIFY messages are sent within the dialog
+		    established by the SUBSCRIBE.
+		</simpara>
+		<simpara>
+		    Note that the first NOTIFY message in <xref linkend="fig-event"> is sent
+			regardless of any event that triggers notifications.
+		</simpara>
+		<simpara>
+		    Subscriptions--as well as registrations--have limited lifespan and therefore must be
+		    periodically refreshed.
+		</simpara>
+	    </section>
+	    <section id="sec-instant-messages">
+		<title>Instant Messages</title>
+		<simpara>
+		    Instant messages are sent using MESSAGE request. MESSAGE requests do not establish a
+		    dialog and therefore they will always traverse the same set of proxies. This is the
+		    simplest form of sending instant messages. The text of the instant message is
+		    transported in the body of the &sip; request.
+		</simpara>
+		<figure id="fig-message" float="0">
+		    <title>Instant Messages</title>
+		    <mediaobject>
+			<imageobject>
+			    <imagedata align="center" scale="40" fileref="figures/message.eps" format="EPS">
+			</imageobject>
+			<imageobject>
+			    <imagedata align="center" fileref="figures/message.png" format="PNG">
+			</imageobject>
+			<textobject>
+			    <phrase>Picture showing a MESSAGE.</phrase>
+			</textobject>
+		    </mediaobject>
+		</figure>
+	    </section>
+	</section>
+    </chapter>
+</book>