M={}
function process_contact_headers(msg)
	if msg:getHeader("From")
		then
			local from = msg:getHeader("From")
			if string.find(from, "\".+\" <sip:")
				then
					local replaceheaderfrom = string.gsub(from, "\".+\" <sip:", "<sip:")
					msg:modifyHeader("From", replaceheaderfrom)
    			end
	end
	if msg:getHeader("P-Preferred-Identity")
		then
			local ppref = msg:getHeader("P-Preferred-Identity")
				if string.find(ppref, "\".+\" <sip:")
					then
						local replaceheaderppref = string.gsub(ppref, "\".+\" <sip:", "<sip:")
						msg:modifyHeader("P-Preferred-Identity", replaceheaderppref)
				end
	end
    	if msg:getHeader("Remote-Party-ID")
		then
    	 		local rpid = msg:getHeader("Remote-Party-ID")
			if string.find(rpid, "\".+\" <sip:")
				then
					local replaceheaderrpid = string.gsub(rpid, "\".+\" <sip:", "<sip:")
					msg:modifyHeader("Remote-Party-ID", replaceheaderrpid)
			end
		- msg:removeHeader("Remote-Party-ID")
	end
end
M.inbound_INVITE = process_contact_headers
M.inbound_ANY_INVITE = process_contact_headers
- M.outbound_ANY_INVITE = process_contact_headers
return M