Increase DTMF Tones

Hi all,

I would like to increase the duration of the DTMF tones of my incoming calls on the PABX. I know that there is equipment making it possible to parameterize this kind of things but I do not find anything in the groups nor on Google. If somebody among you knows this kind of apparatus, can it leave me a reference?

Thanks in advance,

Eric Willem

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frederic.willem
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