[Freeswitch-users] DTMF capture and early media

[Sergey Safarov]

Part of dialplan

    <extension name="early_media_dtmf">
      <condition>
        <action application="pre_answer"/>
        <action application="play_and_get_digits" data="2 5 1 7000 #
/usr/share/freeswitch/sounds/en/us/callie/conference/8000/conf-pin.wav ''
foobar \d+"/>
        <action application="log" data="INFO captured digits ${foobar}"/>
      </condition>
    </extension>

FS output

2016-01-31 00:20:24.399711 [DEBUG] switch_rtp.c:6865 RTP RECV DTMF 1:1600
2016-01-31 00:20:24.399711 [INFO] switch_channel.c:502 RECV DTMF 1:1600
2016-01-31 00:20:24.819718 [DEBUG] switch_rtp.c:6865 RTP RECV DTMF 2:1600
2016-01-31 00:20:24.819718 [INFO] switch_channel.c:502 RECV DTMF 2:1600
2016-01-31 00:20:25.159703 [DEBUG] switch_rtp.c:6865 RTP RECV DTMF 3:1600
2016-01-31 00:20:25.159703 [INFO] switch_channel.c:502 RECV DTMF 3:1600
2016-01-31 00:20:25.539688 [DEBUG] switch_rtp.c:6865 RTP RECV DTMF 4:1600
2016-01-31 00:20:25.539688 [INFO] switch_channel.c:502 RECV DTMF 4:1600
2016-01-31 00:20:25.819704 [DEBUG] switch_rtp.c:6865 RTP RECV DTMF 5:1600
2016-01-31 00:20:25.819704 [INFO] switch_channel.c:502 RECV DTMF 5:1600
EXECUTE sofia/internal/1001 at 91.103.196.13 log(INFO captured digits 12345)
2016-01-31 00:20:25.819704 [INFO] mod_dptools.c:1692 captured digits 12345




On Sun, Jan 31, 2016 at 12:06 AM, Bote Man <bote_radio at botecomm.com> wrote:

> Some (many) carriers only allow one-way audio from the switch to the
> caller so that you don’t get free phone calls. Early media is the part of
> the call that is not billed. If they allow the caller to send audio to the
> switch during this free period it would open them up to fraud.
>
>
>
> Bote
>
>
>
>
>
> *From:* Dmitriy Borisov
> *Sent:* Saturday, 30 January, 2016 15:19
> *Subject:* [Freeswitch-users] DTMF capture and early media
>
>
>
> Hi, All!
>
> https://tools.ietf.org/html/rfc3960 has next part:
> Early media refers to media (e.g., audio and video) that is exchanged
>
>    before a particular session is accepted by the called user.  Within a
>
>    dialog, early media occurs from the moment the initial INVITE is sent
>
>    until the User Agent Server (UAS) generates a final response.  It may
>
>    be unidirectional or bidirectional, and can be generated by the
>
>    caller, the callee, or both. Typical examples of early media   generated by
>    the callee are ringing tone and announcements (e.g.,
>
>    queuing status).  Early media generated by the caller typically
>
>    consists of voice commands or dual tone multi-frequency (DTMF) tones
>
>    to drive interactive voice response (IVR) systems.
>
> But I know that in FreeSWITCH in preanswer state I can`t capture DTMF. Why?
> This part of RFC is conflicting with some other standard? It can be very intresting feature.
>
>
> --
>
> С уважением,
>
> Борисов Дмитрий
>
> Отдел облачных технологий 1С-Рарус
>
> Тел. +7 (495) 231-20-02 доб.: 15-94
>
> --
>
> with best regards,
>
> Dmitriy Borisov
>
> 1C-Rarus Cloud Services
>
> tel.: +7 (495) 231-20-02 add.: 15-94
>
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