SIP FAQ : SIP Protocol Operation : How are SIP parsers implemented?
	Parsers can be implemented either directly from the ABNF or via parser-generator tools. Some tools that have been used include - http://www.gnu.org/software/flex/flex.html flex for lexical analysis - bison (http://www.gnu.org/software/bison/bison.html) or lemon (http://www.hwaci.com/sw/lemon/) for parsing. A somewhat outdated grammar summary can be found at http://www.cs.columbia.edu/~hgs/sip/SIPgrammar.html
	[Append to This Answer]
	hgs@cs.columbia.edu
	2000-Jul-30 1:35pm

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