Vdb770 audio trouble?

I installed VDB770 on sister house, it’s working fine except for audio. When I answer the doorbell on my iPhone , the doorbell speaker transmits my voice, but I cannot hear anything from the doorbell microphone. My iPhone is inside the house, on the same WiFi network.

any suggestions about what setting to change?

I think the first thing I would suggest here is to power cycle the camera by holding down the doorbell button until the LED starts blinking yellow, then release.

Wait for a couple minutes after it boots up, then test again.

Network shouldn’t matter, but you can also try while your phone is disconnected from wifi to see if there is any difference