Extension is busy, call back later

Hello,

FreePBX 16.0.26
When a local pjsip extension is busy and receives another incoming call, it does not tell the caller that “this extension is busy”.
At the same time, the caller has ringing tones.
How can I fix this problem so that the caller hears that “this number is busy, call back later”.

Disable call waiting for the extension.
https://wiki.freepbx.org/display/FPG/Call+Waiting+Module+User+Guide

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