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DTMF with snom 375 and Fritzbox 7590

Do you have any hint how to use sending DTMF tones if the snom is linked with an AVM Fritzbox 7590? 

The fritzbox is registered with a landline of Deutsche Telekom. The Snom is registered at the FRitzbox.

I found no method to send DTMF tones in this constellation.

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