[Freeswitch-users] Ringback after pre_answer without bridge?

[Dmitry Sytchev]

I've tried all variations of ringback and pre_answer order.
I've found solution that works for me, but it appears to be a bug in
displace_session or uuid_displace implementation.

Method1:
Thing that works:
<action application="pre_answer"/>
<action application="set" data="send_silence_when_idle=1400"/>
<action application="displace_session"
data="tone_stream://%(1000,4000,425);loops=-1 0 mux}"/>
<action application="sleep" data="8000"/>

Thing that doesn't work: the above plays tone_stream during sleep, but stop
fails
<action application="stop_displace_session"
data="tone_stream://%(1000,4000,425);loops=-1}"/>. It doesn't stop displace.

Method 2. Use uuid_displace instead of displace_session:
<action application="set" data="api_result=${uuid_displace ${uuid} start
tone_stream://L=5;%(1000,4000,425)}"/>
<action application="sleep" data="8000"/>
<action application="set" data="api_result=${uuid_displace ${uuid} stop
tone_stream://L=5;%(1000,4000,425);}"/>

It works, but there is a problem: it incorrectly interprets tone_stream
syntax of this: "tone_stream://%(1000,4000,425);loops=-1" and plays some
strange DTMF (possibly it interpretes some symbols as DTMF) after generated
sound.



2016-06-03 11:25 GMT+03:00 David Villasmil <david.villasmil.work at gmail.com>:

> Have you tried moving the "pre_answer" to before the ringback?
> ᐧ
>
> On Tue, May 31, 2016 at 1:57 PM, Dmitry Sytchev <kbdfck at gmail.com> wrote:
>
>> Hi all!
>>
>> I'd like to resolve some unclear ringback behavior in early media
>> mode. I'm trying to implement ringback while no bridge active.
>> A calls FS, FS does something, then searching for B and bridges A to B.
>>
>> I'd like to start playing custom ringback immediately after call from
>> A gets into FS, not when we start bridge to B.
>>
>> I'm doing something like that:
>>
>> <action application="set" data="ringback=%(2000, 4000, 440.0, 480.0)"/>
>> <action application="set" data="instant_ringback=true"/>
>> <action application="set" data="bridge_early_media=true"/>
>> <action application="pre_answer"/>
>> <action application="sleep" data="10000"/>
>> ...
>> <action application="bridge" data="some bridge data"/>
>>
>> There is no ringback to A in such scenario until bridge is called in
>> further dialplan processing. I've tried all combinations of
>> ignore/bridge early media, but with no luck. Pre_answer can be called
>> directly or by FS when call is recorded, with no difference. There is
>> a wiki page that recommends usage of ring_ready:
>>
>>
>> https://freeswitch.org/confluence/display/FREESWITCH/mod_dptools%3A+ring_ready
>>
>> ring_ready works, but it can give only Ringing to calling side, so  I
>> can't pass custom RBT to calling party. It would be enough for me, but
>> once somebody calls pre_answer, no early media is passed until bridge
>> attempt.
>>
>> What can be done to resolve this? Thanks in advance.
>>
>>
>>
>>
>>
>>
>>
>> --
>> Best regards,
>>
>> Dmitry Sytchev,
>> IT Engineer
>>
>> _________________________________________________________________________
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>
>
> _________________________________________________________________________
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> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
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> http://confluence.freeswitch.org
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>
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-- 
Best regards,

Dmitry Sytchev,
IT Engineer
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