[Freeswitch-users] DTMF strange problems

[Brian West]

Dialing on speaker phone maybe?

On Mon, Nov 17, 2014 at 3:57 AM, Steven Ayre <steveayre at gmail.com> wrote:

> I looked at PCAPs for concerned calls, and saw that DTMF tones are only
>> sent with RFC2833, not with SIP INFO nor InBand.
>> I first thought that digits may be received simultaneously with RFC2833
>> and InBand but definitely not.
>
>
> Is that end-to-end, or are they reaching you via someone else? Or
> something else (ATA adapter)? If so perhaps some inband->RFC2833 is
> happening between you and them that's introducing the bad digit.
>
> If not can you share the PCAP (or just its RFC2833 packets)? That might
> explain what's happening.
>
>
> Do you think what could be the cause of that ? I don't use  "start_dtmf"
>> in my diaplans, I already saw in other ML topics that this may cause double
>> digit problems.
>
>
> That's only if there's inband and out-of-band (RFC2833/INFO) DTMF at the
> same time. There's no issue otherwise, but using it on a call without
> inband DTMF is a waste of CPU.
>
> If you're getting RFC2833 then any inband audio will only cause double
> digits if you run start_dtmf, inband will be ignored by default.
>
>
> Is there a way to ask freeswitch to only handle 0-9*# characters ? Or any
>> idea, I'll be glad to try anything that can help us !
>
>
> The problem is RFC2833 will be saying the 1 digit finished before the C
> one started, FS can only interpret it as its told to.
>
>
>
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-- 

*Brian West*
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