[Freeswitch-users] DTMF Problems! In-band detection patchy, rfc2833 not working!

[Sidharth Kshatriya]

The tech support guys from my VOIP carrier had the following to say:

"Have you told freeswitch to ANSWER the call prior to the the IVR coming
into play as by default it would answer EARLY MEDIA thus allowing only 1 way
audio and no DTMF."

What does this mean? I answer the call within the lua script.

On Wed, May 25, 2011 at 12:52 AM, Michael Collins <msc at freeswitch.org>wrote:

> I guess what I mean is this: he needs to listen to what ACTUALLY comes down
> the line. There's no substitute for the human ear. If the tones coming down
> the line are not clean or otherwise are not recognizable then I would
> suggest that looking for a solution inside of FreeSWITCH itself may not be
> too helpful...
>
> That being said, if the DTMFs are coming in cleanly then there's definitely
> something hinky going on inside his system.
>
> -MC
>
>
> On Tue, May 24, 2011 at 12:08 PM, Kristian Kielhofner <kris at kriskinc.com>wrote:
>
>> Michael,
>>
>>  I'm not really sure what you mean by this...
>>
>>  The DTMF method used between an endpoint and a SIP carrier is
>> largely determined by the SIP carrier, not the carrier or device on
>> the far end.
>>
>>  On the PSTN DTMF is always inband.  If configured for out of band
>> DTMF it's up to the various media gateways in use by VoIP providers to
>> detect the inband DTMF, squelch it from the G711 input audio, and
>> create out of band events.
>>
>>  Of course if you're configured for inband and using G711 it will be
>> inband all the way through.
>>
>> P.S. - Cell phones either use AMR or EVRC these days and I would guess
>> they're using out of band DTMF too.  I've seen some documentation
>> claiming support for inband DTMF on either but that seems strange to
>> me...
>>
>> On Mon, May 23, 2011 at 10:24 AM, Michael Collins <msc at freeswitch.org>
>> wrote:
>> > Sidharth,
>> > A mobile phone will always send DTMFs in-band, so you need to be ready
>> for
>> > that scenario. I recommend you add this to your dialplan for inbound
>> calls:
>> > http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_start_dtmf
>> > Test various scenarios and make sure they work - call from Skype, from
>> > mobile phone, from a land line, etc. Let us know what happens.
>> > -MC
>> > On Sat, May 21, 2011 at 1:11 AM, Sidharth Kshatriya
>> > <sid.kshatriya at gmail.com> wrote:
>> >>
>> >> Dear Friends,
>> >>
>> >> I'm using a voip carrier Voicenetwork.ca (recommended by someone on
>> this
>> >> list). While I'm generally happy with their service there seems to be
>> one
>> >> fatal problem: My IVR does not recognize DTMF!
>> >>
>> >> I have set <param name="dtmf-type" value="rfc2833"/> in both
>> >> sip_profile/internal.xml and sip_profile/external.xml
>> >>
>> >> The symptom of the problem is that making a call via skype will always
>> >> make the IVR recognize the DTMF while using something like a mobile
>> phone
>> >> almost always won't!
>> >>
>> >> I've tried in-band detection too. I'm making international calls into
>> my
>> >> IVR and the reliability of the in-band detection is not so good,
>> possibly
>> >> because of the quality of the call.
>> >>
>> >> Can someone please help me?
>> >>
>> >> Thanks,
>> >>
>> >> Sidharth
>> >>
>> >> --
>> >> Sidharth Kshatriya
>> >> www.sidk.info
>> >>
>> >>
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>> >
>> >
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>>
>>
>>
>> --
>> Kristian Kielhofner
>>
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-- 
Sidharth Kshatriya
www.sidk.info
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