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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