[SR-Users] Waiting for calls

[Joel Serrano]

Hello Mark,

Have you given TSILO module a try?

https://kamailio.org/docs/modules/5.2.x/modules/tsilo.html


On Thu, Feb 7, 2019 at 12:18 Mark Hall <mark at brightvoip.co.uk> wrote:

> Hi,
>
>
>
> I am using Kamailio as a gateway for inbound calls to a group of Asterisk
> servers.
>
>
>
> One particular call scenario involves matching pairs of calls. Originally
> I was just sending the calls through to Asterisk for processing (including
> the ‘matching up’), but there is a further requirement that the first
> received call must not be answered until its matching call arrives – and
> this is a little awkward in Asterisk, especially if there will be many
> calls.
>
>
>
> I thought of t_suspend/t_continue functionality in Kamailio.  I have
> implemented this:
>
>
>
> CallA arrives.
>
> Send 180-ringing
>
> Use ds_select_dst() to choose an Asterisk to handle the paired calls
>
> Store destination and other data in an htable so that I can match the call
> later.
>
> Invoke t_suspend() for CallA.
>
>
>
> What I have implemented when the matching call arrives is this:
>
>
>
> CallB arrives (and some logic matches it to the suspended CallA).
>
> Invoke t_continue(‘id’,’label’,’CONTINUE_CALL’); so that CallA is now
> released and the route ends in t_relay() to send it on to Asterisk.
>
> Set $du on CallB to match the destination, then t_relay() this call to
> send it on to the same Asterisk.
>
>
>
> The solution almost works, but there is a problem.
>
>
>
> The t_relay() for CallA is fine, and the call is forwarded.
>
>
>
> When the script runs the t_relay() for CallB, I get this logged:
> ERROR: tm [t_fwd.c:1728]: t_forward_nonack(): no branches for forwarding
>
> ERROR: sl [sl_funcs.c:362]: sl_reply_error(): stateless error reply used:
> I'm terribly sorry, server error occurred (6/SL)
>
>
>
> AND after each call I notice an extra transaction stuck in Kamailio (when
> I use kamctl rpc tm.list).
>
> Can anyone point out where my Kamailio/SIP understanding has let me down?
>
> Many Thanks,
>
> Mark Hall
>
>
>
>
>
>
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