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820 - 8.4.35FW NO DTMF


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Calling on PSTN (Mediatrix 1204) with Snom820 (FW 8.4.35) - No DTMF detection,

Calling with another device, SNOM870, SNOM821, M3, iPhone, DTMF working just fine.

 

I have looked at all settings and I cannot fin any issues....

 

SnomONE V.4.3.0.5021 MacOS

Any ideas!

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