Only One Part Can Hear The Voice During The Call - ATCOM AT840 User Manual

AT840 Series User Manual

2.3 Only one part can hear the voice during the call

A. Make an IP dial-up call to make sure the telephone receiver and 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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