Morning Paul:
Thanks a million, mate!
So, if I understood correctly, in the:
if (!t_relay()) {
sl_reply_error();
!t_relay will check the error condition in sending out the stateful message.
However, in this code snippet, t_relay is not explicitly called. Therefore, as
in kamailio-advanced-config, route[relay] should be performing this.
But it is not the case. Instead the main routing block first calls several
other routes:
route(REQINIT);
route(NATDETECT);
and then # CANCEL processing
if (is_method("CANCEL")) {
if (t_check_trans()) ????????
t_relay();
exit;
Please forgive my ignorance, but I am baffled here.
The next occurrence of t_relay is:
if ( is_method("ACK") ) {
if ( t_check_trans() ) {
# no loose-route, but stateful ACK;
# must be an ACK after a 487
# or e.g. 404 from upstream server
t_relay();
exit;
Many anticipatory thanks again!
Have an awesome day!
Zaka
________________________________________
From: sr-users-boun...@lists.sip-router.org
[sr-users-boun...@lists.sip-router.org] on behalf of Paul Smith
[paul.sm...@claritytele.com]
Sent: Thursday, November 13, 2014 9:38 AM
To: sr-users@lists.sip-router.org
Subject: Re: [SR-Users] Kamailio Routing Logic
Hi Zaka,
The stageful forwarding takes place in the t_relay() function. If relaying is
unsuccessful then an error is returned and the conditional block executed to
send an error back to the originator using sl_reply_error().
Your other question is about why to use the call to route(1): Yes you could
just put the content of route[1] into the main route block and it would work
fine. In more complex scripts it is neater to put code which is executed in
lots of different place into a separate block and then call the block. That way
if you need to modify that code you only have one place to maintain. The
t_relay() function is a good example of a block of functionality that is
reached from loads of places … so generally a route[relay] block is a good idea.
Paul Smith
On 13 Nov 2014, at 07:52, Zaka Ul Isam <zaka...@albtelecom.al> wrote:
> Hello Friends and Gurus:
>
> I am struggling with routing and need a bit of clarification WRT following:
>
> route {
> if ($fU=="601"&&is_method("INVITE"))
> record_route();
> rewritehost("10.0.10.111"); //SS IP
> route(1);
> }
> route[1] {
> # send it out now; use stateful forwarding as it works reliably
> # even for UDP2TCP
> if (!t_relay()) {
> sl_reply_error();
> };
> exit;
> }
> * In the above stateful forwarding what is the rationale of calling route (1)
> within main route block? Could the t_relay statement afyer rewriting the host
> part of URI not have performed the stateful forwarding?
>
> ** In route[1] there is is only an expression abt logical not condition about
> t_relay() (if methods in this function are not invoked??)
> I wonder where exactly is stateful forwarding taking place?
>
> 1- Is it the default action?
> 2- Or in function sl_reply_error()?
>
> Thanks a lot in advance!
>
> Zaka
>
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