[Freeswitch-users] Duplicate DTMF Events - Please Help!

[curriegrad2004]

All TDM links send DTMF tones as in-band only. Your only option for
detecting such tones is to use in-band DTMF tone detection.

If Sangoma offered a RFC2833 option for their cards, the most likely
the card is doing the DTMF detection, which also could lead to a buggy
detector on the card.

On Mon, Jul 16, 2012 at 8:32 PM, Brian Foster <bdfoster at endigotech.com> wrote:
> Rfc2833 is for sip, not for analog. Other than that I don't have much to
> offer. Try using inband only.
>
> Brian Foster
> Endigo Computer LLC
>
> Sent from a mobile device.
>
> On Jul 16, 2012 6:50 PM, "Joann R DeJesus" <Joann.DeJesus at convergys.com>
> wrote:
>>
>> Hello All,
>>
>>
>>
>> I hope someone has experience this issue and can quickly assist me!  We
>> are supposed to be going live with a customer in a couple of days and need
>> to find a resolution quickly in order to stay on track…
>>
>>
>>
>> We are using Freeswitch with Sangoma T1 cards to bridge TDM with our
>> internal VoIP system. Call flow is as follows:
>>
>>
>>
>> PSTN --> T1/Sangoma cards --> Freeswitch --> IVR
>>
>>
>>
>> I have configured Freeswitch for RFC2833.  When I make a call to the IVR
>> from a landline or cell phone and press "5" at a prompt, FS will sometimes
>> send two separate DTMF events to the IVR.  This causes the IVR to receive
>> "55" which then sends the call to the incorrect destination.
>>
>>
>>
>> I can verify with Wireshark that FS is sending two separate RFC2833
>> events.  For some reason, this is exacerbated with heavy call volume (easy
>> to reproduce during load testing).  Has anyone experienced this symptom or
>> have any ideas what I can check?
>>
>>
>>
>> Thanks in advance for any assistance!!
>>
>>
>>
>> - Joann
>>
>>
>>
>>
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>
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>
> 
> 
>
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