oSIP headers definitions

Modules
	oSIP accept header definition.
	oSIP accept-encoding header definition.
	oSIP accept-language header definition.
	oSIP alert-info definition.
	oSIP allow header definition.
	oSIP authentication-info header definition.
	oSIP authorization header definition.
	oSIP call-id header definition.
	oSIP call-info header definition.
	oSIP contact header definition.
	oSIP content-disposition definition.
	oSIP content-encoding header definition.
	oSIP content-length definition.
	oSIP content-type header definition.
	oSIP cseq header definition.
	oSIP error-info definition.
	oSIP from header definition.
	oSIP header definition.
	oSIP mime-version header definition.
	oSIP proxy-authenticate header definition.
	oSIP proxy-authentication-info header definition.
	oSIP proxy-authorization header definition.
	oSIP record-route header definition.
	oSIP route header definition.
	oSIP to header definition.
	oSIP via header definition.
	oSIP www-authenticate header definition.