[Freeswitch-users] DTMF Issue - Unexpected digits are receiving

[Branden Jordan]

A is a valid DTMF digit so I wouldn’t worry about it too much and just handle A-D in your valid TT fields. I see around a million calls a day and see a few hundred A-D DTMF. It’s rare, but some really old phones still have the A-D DTMF on them, and softphones have the ability to send them as well, maybe your user is using a softphone on their end?

From: FreeSWITCH-users <freeswitch-users-bounces at lists.freeswitch.org> On Behalf Of Chandramouli P
Sent: Monday, October 22, 2018 11:23 PM
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] DTMF Issue - Unexpected digits are receiving

Hello Abdullah,

Thank you for your reply. By following your hint, I tried to regenerate the issue. I tried by getting voice mail beep, other beeps like receiving SMS, WhatsApp messages etc. But, unable to simulate.

Thank you.

Best regards,
Chandramouli.
On Mon, Oct 22, 2018 at 8:00 PM Vallimamod Abdullah <vma at vallimamod.org<mailto:vma at vallimamod.org>> wrote:
Hi,

I encountered the same issue in the past and have noticed that it was the mobile voicemail beep tone that was sometimes converted to 'A' dtmf on the isdn gateway.

Maybe your case is similar?


Best Regards,
--
Vallimamod Abdullah
SIP Solutions
vma at sip.solutions<mailto:vma at sip.solutions>
linkedin.com/in/vallimamod<http://linkedin.com/in/vallimamod>
.


On 22 Oct 2018, at 08:24, Chandramouli P <mouli123 at gmail.com<mailto:mouli123 at gmail.com>> wrote:

Hello David,

Thanks for your reply and I understand. But, As I explained, we tried to regenerate the issue by pressing different keys on dial pad. But, FreeSwitch is receiving the digits as usual every time. So, which key was pressed by the user on dial pad to send "A"? Any assumptions?

Thank you.

Best regards,
Chandramouli.
On Sun, Oct 21, 2018 at 10:53 PM David Villasmil <david.villasmil.work at gmail.com<mailto:david.villasmil.work at gmail.com>> wrote:

From what i know, "A" is a multifrequency tone, 697hz+1633hz. Maybe the client is actually sending that.

On Sat, Oct 20, 2018, 17:54 Chandramouli P <mouli123 at gmail.com<mailto:mouli123 at gmail.com>> wrote:
Hello,

We developed an application (FreeSwitch) that receives pressed digit by the end user on mobile phone dialer through DTMF and some action will be performed. Everything is working fine till now. But, we noticed one issue recently. From the FreeSwitch log, we came to know that FreeSwitch is received the letter i.e. "A" from DTMF, instead of digit. We tried to regenerate this issue. But, when we are trying to regenerate, FreeSwitch is receiving the digit from DTMF as usual. I would like to know How FreeSwitch is received the letter i.e. "A", instead of digit. Which key was pressed by the end user on mobile phone dialer?

Thank you.

Best Regards,
Chandramouli.

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