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

6 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@lists.openser.org
 wrote:
...
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Today's Topics:

Re: Openser as a conditional stateless proxy (Christian Schlatter)
Presence RLS module: initialization error (Schumann Sebastian)
CPL and XML schema (Daniel)
Re: MediaProxy 1.9.0 - Radius (Miles Scruggs)
Re: Is it possible to insert avp to reply message? (Tung Tran)
Re: Is it possible to insert avp to reply message?
(I?aki Baz Castillo)
Cellphones and voicemail (Chris Heiser)
dispatcher with GeoIP (Victor Sergeev)
Re: Cellphones and voicemail (Christian Schlatter)
Re: retransmissions after final response (Vasile Zaharia)

Message: 1
Date: Mon, 05 Nov 2007 10:16:18 -0500
From: Christian Schlatter cs@unc.edu
Subject: Re: [OpenSER-Users] Openser as a conditional stateless proxy
To: Padmaja padmaja.rv@vodcalabs.com
Cc: users@lists.openser.org
Message-ID: 472F33C2.90900@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@lists.openser.org so that others can take 
advantage of the discussion.
/Christian
...
Thanks again,
Padmaja
----- Original Message ----- From: "Christian Schlatter" cs@unc.edu
To: "Padmaja" padmaja.rv@vodcalabs.com
Cc: users@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

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