New subject: [Users] Routing to NATed gateways

8 Nov 2005

In other words, the simplified configuration may be as the following:

    # Save original user name (the called phone number).
    avp_printf("$orig_called_num", "$rU");
    if (load_gws())
    {
        if (next_gw())
        {
           if (lookup("location")) 
           {
                avp_pushto("$ruri/username", "$orig_called_num");
                t_on_failure("2");
                route(x); # NAT and other usual staff there
                exit;
           }
           else 
           {
                xlog("L_INFO", "I have to think what to do in this
situation.\n");
                sl_send_reply("404", "User Not Found");
           }
        }
    }

failure_route[2]
{
    if (method=="INVITE" && t_check_status("408|500|503"))
    {
        if (!next_gw())
        {
            t_reply("503", "Service not available, no more
gateways");
        }
        else
        {
            if (!lookup("location")) 
            {
                xlog("L_INFO", "I have to think what to do in this
situation.\n");
                t_reply("503", "Service not available, no more
gateways");
                exit;
            };
            t_on_failure("2");
            t_on_branch("2");
            t_relay();
        }
    }
}

branch_route[2]
{
    avp_pushto("$ruri/username", "$orig_called_num");
}      

Am I correct? Actually I don't know what to do if one of the gateways is
off-line (lookup() failed). 

Best regards,
Leonid Fainshtein 
-----Original Message-----
From: Bogdan-Andrei Iancu [mailto:bogdan@voice-system.ro] 
Sent: Tuesday, November 08, 2005 5:30 PM
To: Leonid Fainshtein
Cc: users(a)openser.org
Subject: Re: [Users] Routing to NATed gateways

Hi Leonid,

the scenario you are probing might be already doable. Set in the LCR
table some IP addresses which will be used as aliases: private addresses
in 10.10.x.x class for example. Then register this IPs in usrloc
pointing to the real GWs address.
So you can do lcr (next_gw) and then lookup.

for this to work, lcr must operate on RURI and not on DST_URI (not sure
how exactly is working).

regards,
bogdan

Leonid Fainshtein wrote:

...
 Hi,
I'd like to use OpenSER for routing calls to NATed gateways. I also 
want to support the LCR feature. Unfortunately, the current LCR module 
doesn't support NAT. I mean that the gateway IP addresses must be 
defined explicitly  in the "gtw" table. Now I'm looking for a way to 
force OpenSer to use information from the "location" table.
I want to write a module that will have the similar functionality like 
the current LCR module has but resolving procedure will be more 
complicated (not based on prefix and From only). The module should 
build avp list where each gateway will have symbolic user name. For 
example, g1, g2 etc. The gateways will also be registered on the proxy 
with those names. Then I think it will be possible to call 
lookup("location") after successful call the next_gtw() from the script.
...
 Is it feasible? Is there another way to solve my
problem?

Thank you in advance,
Leonid Fainshtein

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RE: [Users] Routing to NATed gateways