[OpenSER-Users] Openser as a conditional stateless proxy

[Christian Schlatter]

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
>>
>