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

5 Nov 2007

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