FreePBX has changed a bit since this message was originally posted and it appears to be much easier to eliminate the FreePBX intercom beep. Here’s what I did:
Open command prompt:
cd /var/www/html/admin/modules/paging
nano functions.inc.php
CTRL-W, then type “beep”
Change “$doptions = ‘A(beep)’;” by removing word beep, so that it reads:
$doptions = ‘A()’;
Ctrl-O to save
Ctrl-X to Exit
Then make go to the FreePBX GUI, save, and hit the orange reload bar.