13 Nov
2014
13 Nov
'14
11:28 a.m.
Hi Zaka
You have misunderstood this line : if (!t_relay()) {
That line explicitly calls t_relay() and the packet is relayed at that time. If the
packet cannot be relayed then the t_relay() function returns an error and the conditional
block is executed.
Paul Smith
On 13 Nov 2014, at 09:10, Zaka Ul Isam <Zaka.Ul(a)albtelecom.al> wrote:
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-bounces(a)lists.sip-router.org [sr-users-bounces(a)lists.sip-router.org] on
behalf of Paul Smith [paul.smith(a)claritytele.com]
Sent: Thursday, November 13, 2014 9:38 AM
To: sr-users(a)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.Ul(a)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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