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  1. No DTMF from Yealink W56H to door intercom

    Thanks John. The 'Behnke' also supports different DTMF modes, which I have tried. Our partner has no idea, he also says it's not a supported device. I will give Wireshark a try.

  2. No DTMF from Yealink W56H to door intercom

    Sorry, if this is a cross posting, I've already asked in the german forum. Please delete if unwanted. When someone is ringinging at the door intercom (SIP, german manufacturer 'Behnke'), I can speak, and open the door with dialing a '0'. It works fine from the table phones of Yealink, but not...
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