I was able to register your device with our SIP server, but when I tried to enter a DTMF tone there was no function.

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Make sure your SIP phone is set to 101 for the DTMF payload type (Out of Band RFC2833).

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When dialing the three-digit DTMF tone on the IP phone, I can hear the DTMF-tones coming out of the speaker of the VoIP device but there is no relay action. The relay works when using the relay test-button on the configuration software. How do I fix this?
After a period of time, my device stops working or is unreachable.