You could always create the illusion that the call hasn't been answered yet by using MoH attached to a stream that provides ringing, this would allow you to get around the 1-2 minute call timeout.
From: FreeSWITCH-users [freeswitch-users-bounces@lists.freeswitch.org] on behalf of Sergey Safarov [s.safarov@gmail.com]
Sent: 25 October 2017 06:44
To: FreeSWITCH Users Help
Subject: Re: [Freeswitch-users] is it possible to use mod_callcenter queues without answering the line

I made this on my server by changing module source code.
As say GM phy is importand to get answer from agent durring 1-2 minutes after call queried


ср, 25 окт. 2017 г., 1:37 Ítalo Rossi <italo@freeswitch.org>:
Don't do that. :)
Em ter, 24 de out de 2017 às 18:16, GM phy <servtelar@gmail.com> escreveu:
Hi

That’s not a mandatory requirement at all, waiting time counts as part of the call.
Doing something like that you’ll have a network disconnection due lack of answer, no matter if you send 180 or 183. The timeout will depend on the scenario on each country, but in general terms it will be between one or two minutes.

GM


> On Oct 24, 2017, at 4:00 PM, Khalil Khamlichi <khamlichi.khalil@gmail.com> wrote:
>
> Hi,
>
> is it possible to use mod_callcenter queues without answering the
> line, that is the customer is held in the queue and hearing ringing
> (without the call being answered).
>
> In fact this is a mandatory requirement when calls have a cost and we
> don't want to charge customer for waiting time but only for talk time.
>
> Thanks in advance.
>
> Khalil
>
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