[Freeswitch-users] Prolems with DTMF

[Michael Collins]

On Tue, Jun 2, 2009 at 11:37 AM, Rudolf Denert <rdenert at tng.de> wrote:

> Hello,
>
> I'm not sure which one is it. But I think I send the digits in RFC 2833.
> All devicves are supporting RFC 2833.
>

Actually, that's very interesting. The start_dtmf app looks for in-band
DTMFs, so if you have to have that in order to hear digits from the other
end then the other end most definitely isn't doing RFC2833.

For the sake of testing, try sending in-band and see how the other end
reacts. Might want to check this out:
http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_start_dtmf_generate

My guess is that the equipment along the way is futzing with things.
FreeSWITCH does break easily but it does find bugs in other VoIP systems
that it talks to... :)

-MC


>
> The equipment:
> (VoATM)
> Allied Data Copperjet 1614 (ISDN)
> Siemens Euroset 5020 phone
>
> (MGCP)
> Thomson SpeedTouch 780WL
> Siemens Euroset 5020 phone
>
> (SIP)
> AVM Fritz!Box 7170
> Siemens Euroset 5020 phone
>
> If necessary I can send my configuration.
>
> Greetz
>
> ----- Ursprüngliche Mail -----
> Von: "Michael Collins" <msc at freeswitch.org>
> An: freeswitch-users at lists.freeswitch.org
> Gesendet: Dienstag, 2. Juni 2009 20:18:41 GMT +01:00
> Amsterdam/Berlin/Bern/Rom/Stockholm/Wien
> Betreff: Re: [Freeswitch-users] Prolems with DTMF
>
>
>
>
>
> On Tue, Jun 2, 2009 at 9:18 AM, Rudolf Denert < rdenert at tng.de > wrote:
>
>
> Hello,
>
> I have problems with sending DTMF. The freeswitch server recieves the
> digits from my telefon (SIP account) if I activate DTMF with:
> <action application="start_dtmf"/>
> in my dialplan.
>
> The line
> <--param name="dtmf-type" value="rfc2833"/-->
> in sofia.conf.xml is active, too.
>
> But than I have the problem that the other phone doesn't work. It is a
> VoATM device. The curious thing is that I see the digits in the logfile
> whiche were sent from the phone. In the first example I saw nothing.
>
> Does anybody have an idea???
>
>
> Are you trying to send digits inband or RFC2833? Unless there's a
> compelling reason not to, we recommend 2833. What is the equipment on the
> far end looking for?
>
>
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> --
> --
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