The three error beeps don't occur, but nor does the 'Ding Dong' occur at the intercom. A non-descript 'beep' occurs at the intercom, the same sound as when 'Doorbell Mode' is set to 'Doorbell Output Control'.
I've logged a ticket with Grandstream and they've responded -
"If we propose the following option to our developers, would it be sufficient to meet the requirement?
For all doorbell modes, add the option to choose between the following:
If enabled = GDS will ring inside and outside.
If disabled (default) = we keep the current design (only inside bell will ring and GDS not).
Thanks & Regards,
Grandstream Support"
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