[OpenSER-Users] OpenSER as a conditional stateless proxy

Tue Nov 6 14:05:29 CET 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 at lists.openser.org
 wrote:
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> Today's Topics:
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>    1. Re: Openser as a conditional stateless proxy (Christian Schlatter)
>    2. Presence RLS module: initialization error (Schumann Sebastian)
>    3. CPL and XML schema (Daniel)
>    4. Re: MediaProxy 1.9.0 - Radius (Miles Scruggs)
>    5. Re: Is it possible to insert avp to reply message? (Tung Tran)
>    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 <cs at unc.edu>
> Subject: Re: [OpenSER-Users] Openser as a conditional stateless proxy
> To: Padmaja <padmaja.rv at vodcalabs.com>
> Cc: users at lists.openser.org
> Message-ID: <472F33C2.90900 at unc.edu>
> 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 at lists.openser.org so that others can take 
> advantage of the discussion.
> 
> /Christian
> 
> > 
> > Thanks again,
> > Padmaja
> > 
> > ----- Original Message ----- From: "Christian Schlatter" <cs at unc.edu>
> > To: "Padmaja" <padmaja.rv at vodcalabs.com>
> > Cc: <users at lists.openser.org>
> > 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