[Users] Checking Request-URI

[Andreas Sikkema]

Hi,

Yesterday I noticed something strange happenign one on of our 
servers. Calls were being sent to servers within our VoIP 
platform by OpenSER without (as far as I can see) really being 
handled according to our OpenSER configuration.

When I looked into it, I found that the Request-URI contained 
the IP address of the internal server, instead of the IP address 
of our OpenSER machine or our SIP domain.

How can I check that the Request-URI contains only the SIP 
domain or the IP address of the OpenSER server? 

Might this have something to do with the loose_route() block?

Here's (heavily edited) basically our INVITE handling code from 
openser.cfg:

if (loose_route())
{
	use_media_proxy();

	t_relay();
	exit;
};

if (method=="INVITE")
{
	t_on_reply("1");

	rewritehost("SIP_DOMAIN");

	# Check if it is international number format
	if (uri=~"^sip:00")
	{
		strip(2);
	};

	if ( (method == "INVITE") )
	{
		if (!proxy_authorize("SIP_DOMAIN", "subscriber"))
		{
			proxy_challenge("SIP_DOMAIN", "0");
			exit;
		};

		# let's check from=id ... avoids accounting confusion
		if (!check_from())
		{
			sl_send_reply("403", "That is ugly -- use
From=id next time (gw)");
			exit;
		};
	};

	if (is_uri_host_local())
	{
		log("ATS: incoming message is for a local host ($tu)");

		route(3);
	};

-- 
Andreas Sikkema