ReInvites like all in-dialog requests are processed in has_totag()/loose_route part. Default kamailio.cfg has almost identical part for this purpose.

Main idea is that an initial request (non in-dialog) hasn't To tag already. It appears only when your request "hits" remote side (called or callee, as you wish) and goes back to you. Simplified, but I hope you got an idea :)

Hi Alex,

Thank you for your reply.

Does below config forward all sip requests coming from the customer to the supplier , and relay sip replies back to customer ?

Where re-invite packets are handled in the below config file?

Thank you
Ali Taher

-----Original Message-----
From: sr-users <sr-users-bounces@lists.kamailio.org> On Behalf Of Alex Balashov
Sent: Tuesday, July 17, 2018 4:25 PM
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
Cc: sr-users@lists.sip-router.org
Subject: Re: [SR-Users] SIP re-invite Packets

On Tue, Jul 17, 2018 at 04:21:25PM +0300, Ali Taher wrote:

> Can you please send me a simplified config that suit my case ?

Try this for a main request route:

---

route {
if(!mf_process_maxfwd_header("10")) {
sl_send_reply("483", "Too Many Hops");
exit;
}

# Maybe some sanity_check() here.

if(has_totag()) {
if(loose_route()) {
if(!t_relay())
sl_reply_error();

exit;
} else {
if(is_method("ACK")) {
if(t_check_trans())
t_relay();
} else
sl_send_reply("403", "Forbidden");
}

exit;
}

# CANCELs / branches.

if(is_method("CANCEL")) {
if(!t_relay_cancel()) {
sl_send_reply("500", "Server Internal Error");
exit;
}

exit;
}

t_check_trans();

if(is_method("OPTIONS")) {
sl_send_reply("200", "OK");
exit;
}

else if(is_method("INVITE")) {
# Route your calls.

exit;
}

sl_send_reply("403", "Method unsupported");
exit;
}


--
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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