<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" 
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

<section id="fline_parser" xmlns:xi="http://www.w3.org/2001/XInclude">
    <sectioninfo>
	<revhistory>
	    <revision>
		<revnumber>$Revision$</revnumber>
		<date>$Date$</date>
	    </revision>
	</revhistory>

    </sectioninfo>
    
    <title>The First Line Parser</title>
    <para>
	Purpose of the parser is to parse the first line of a
	<acronym>SIP</acronym> message. The first line is represented by
	<structname>msg_start</structname> structure define in file
	<filename>parse_fline.h</filename> under <filename>parser</filename>
	subdirectory.
    </para>
    <para>
	The main function of the first line parser is
	<function>parse_first_line</function>, the function will fill in
	<structname>msg_start</structname> structure.
    </para>
    <para>
	Follow inline comments in the function if you want to add support for a
	new message type.
    </para>
</section>
