New subject: [OpenSER-Users] OpenSER as a conditional stateless proxy

7 Nov 2007

Hi,
Iam too interested in this discussion, can some one explicitly elaborate
how iam gonna satisfy all the conditions in a situation whereby OpenSER
is relaying to Asterisk for local PSTN calls and to another a voip
provider for International PSTN calls, ofcourse this applies for any
numeric uri.

I have a Sipwise generated config with offnet-termination which i tried
to edit route [5] 'invite-find-calee' using t_relay() and
rewritehostport conditions, but my concern is the role of LCR module
which is supposed to be taking care of the GWs especially in route[7]
"Request route invite-to-external", will it gonna disrupt/conflict my
set conditions??

########################################################################
# Request route 'invite-find-callee'
########################################################################
route[5]
{
	if(alias_db_lookup("dbaliases"))
	{

		xlog("L_INFO", "Callee was aliased - M=$rm RURI=$ru F=$fu T=$tu IP=$si
ID=$ci\n");
#CHECK WHERE THE REQUEST IS FROM???-edit by me
if($fd=="sip.domain")
{
#FORWARD THEM TO ASTERISK -edit by me
rewritehostport("asterisk IP");
#AND THEN TAKE THEM TO REQUEST ROUTE 'base-outbound'-edit by me
route(3);
}
else if(uri=~"Sip:00[0-9]+@"){
#RELAY THEM TO INTERNETIONAL PSTN-edit by me
t_relay("IP_of_international_PSTN_ provider");
route (3);
}
	if(!is_domain_local("$rd"))
	{
		setflag(20);

		route(7);
	}
	if(does_uri_exist())
	{

		xlog("L_INFO", "Callee is local - M=$rm RURI=$ru F=$fu T=$tu IP=$si
ID=$ci\n");
		route(6);
	}
	else
	{

		xlog("L_INFO", "Callee is not local - M=$rm RURI=$ru F=$fu T=$tu IP=
$si ID=$ci\n");
		route(7);
	}
	exit;

}

########################################################################
# Request route 'invite-to-external'
########################################################################
route[7]
{
	if(isflagset(20))
	{

		xlog("L_INFO", "Call to foreign domain - M=$rm RURI=$ru F=$fu T=$tu
IP=$si ID=$ci\n");
		route(3);
		exit;
	}
	if(!isflagset(23))
	{
		# don't allow calls relaying from PSTN to PSTN, if not explicitely
forwarded
		if(uri =~ "^sip:[0-9]+@")
		{
			# only route numeric users to PSTN
			if(!load_gws())
			{

				xlog("L_ERR", "Error loading PSTN gateways - M=$rm RURI=$ru F=$fu T=
$tu IP=$si ID=$ci\n");
				sl_send_reply("503", "PSTN Termination Currently Unavailable");
				exit;
			}
			if(!next_gw())
			{

				xlog("L_ERR", "No PSTN gateways available - M=$rm RURI=$ru F=$fu T=
$tu IP=$si ID=$ci\n");
				sl_send_reply("503", "PSTN Termination Currently Unavailable");
				exit;
			}
			setflag(21);

			t_on_failure("1");
			route(3);
		}
	}

	xlog("L_INFO", "Call to unknown user - M=$rm RURI=$ru F=$fu T=$tu IP=
$si ID=$ci\n");
	sl_send_reply("404", "User Not Found");
	exit;

} 
WBR,
LU.

On Tue, 2007-11-06 at 06:35 +0000, users-request(a)lists.openser.org
 wrote:
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 Today's Topics:

    1. Re: Openser as a conditional stateless proxy (Christian Schlatter)
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    4. Re: MediaProxy 1.9.0 - Radius (Miles Scruggs)
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    6. Re: Is it possible to insert avp to reply message?
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    7. Cellphones and voicemail (Chris Heiser)
    8. dispatcher with GeoIP (Victor Sergeev)
    9. Re: Cellphones and voicemail (Christian Schlatter)
   10. Re: retransmissions after final response (Vasile Zaharia)

 ----------------------------------------------------------------------

 Message: 1
 Date: Mon, 05 Nov 2007 10:16:18 -0500
 From: Christian Schlatter &lt;cs(a)unc.edu&gt;
 Subject: Re: [OpenSER-Users] Openser as a conditional stateless proxy
 To: Padmaja &lt;padmaja.rv(a)vodcalabs.com&gt;
 Cc: users(a)lists.openser.org
 Message-ID: &lt;472F33C2.90900(a)unc.edu&gt;
 Content-Type: text/plain; charset=ISO-8859-1; format=flowed

 Padmaja wrote:
  Hi,

 Thanks for the reply,
 Could you provide me the example script for stateless forwarding of 
 invite when a call is received from say a 911 operator to the server?
 I suppose this should be implemented by checking the From field of the 
 invite and if it is from a certain 911, then it should be forwarded 
 statelessly (or is this logic incorrect?). I am new to the Openser 
 stuff, so I do not wish to change the script myself.  

 Your logic is correct, you can either check the From: header or the 
 request URI or any other part of an incoming SIP message to make the 
 routing decision.

 A simple example looks like:

 if (is_method('INVITE'))
 {
      # check if from URI domain equals 911operator.com
      if ($fd == '911operator.com')
      {
          # relay stateless using request URI
          forward();
          exit;
      }
      else
      {
          # relay statefull using request URI
          if (!t_relay())
          {
              sl_reply_error();
          };
          exit;
      }
 }

 Please always CC users(a)lists.openser.org so that others can take 
 advantage of the discussion.

 /Christian

 > 
 > Thanks again,
 > Padmaja
 > 
 > ----- Original Message ----- From: "Christian Schlatter"
&lt;cs(a)unc.edu&gt;
 > To: "Padmaja" &lt;padmaja.rv(a)vodcalabs.com&gt;
 > Cc: &lt;users(a)lists.openser.org&gt;
 > Sent: Monday, November 05, 2007 4:53 AM
 > Subject: Re: [OpenSER-Users] Openser as a conditional stateless proxy
 > 
 > 
 >> Padmaja wrote:
 >>> Hi all,
 >>>
 >>> Can any one tell me if the same running instance of Openser can be 
 >>> configured as a stateful proxy for some user accounts and for some 
 >>> numbers like emergency services, it acts like a stateless proxy, just 
 >>> forwarding the request to the destination?
 >>
 >> Yes, it only depends on what forwarding function is used in the 
 >> routing script:
 >>
 >> - t_forward(..) --> stateless
 >>
 >> - t_relay(..) --> stateful
 >>
 >> /Christian 

Re: [OpenSER-Users] OpenSER as a conditional stateless proxy