Only One Part Can Hear The Voice During The Call - ATCOM AT820 User Manual

AT820 Series User Manual

6.2.3 Only one part can hear the voice during the call

A. Make an IP dial-up call to make sure the headset's telephone receiver
Mic are normal.
B. Enable STUN on web page.
C. Set STUN server as stun.3cx.com.
D. Click on "submit" and wait for the phone to restart.
E. Try to make calls again.
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