Can MT8870 DTMF decoder module handles none audible signals?

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Thank you so much for your response.

My phone is a Samsung Galaxy 7 Edge.
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Is this the receiver phone, witch is connected to that pharmacy system or a DTMF decoder? For sure I will test with It ASAP. I hope you tell me if there some settings you done on this phone.

I then called my desk phone. When I press a number on my mobile, I hear a beep in my mobile, but nothing from my desk phone receiver.
Click to expand...
Did you try to connect this one to that system and get it to work? Can any DTMF decoder detect key pressed with this phone?
 
The samsung is my mobile phone. It is what I use to place a call to the pharmacy. I've made no changes to any settings on this phone for this process.

As I said, I did not hear any DTMF tones during any of the tests I described above. I don't know anything about the system that the pharmacy uses at their end. Only how I interact with it through my phone.
 
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