"include rtp_additional.conf" commented out in rtp.conf

"No Audio" issue.
 
It turns out that the "include rtp_additional.conf" line is commented out in the "rtp.conf" file.
 
My current install versions:
 
-  PBX Version: 15.0.17.43
-  PBX Distro: 12.7.8-2107-3.sng7
-  Asterisk Version: 16.17.0
 
Basically I could call the PBX and hear the playback.  However, when I called an extension:
-  I hear the dial tone.
-  call an extension.
-  extension would ring.
-  I'd pick up ringing extension.
-  could not hear anything, in either direction.
 
This KB fixed my "No Audio" issue:
https://support.digium.com/s/article/Why-do-SIP-extensions-configured-in-FreePBX-have-no-audio-during-calls
 
I ran into this with my configured install, but couldn't solve it. So I did a clean install, from the SNG7-20224 image on a USB stick. Then I updated the CentOS 7 system (yum update) and then updated the Modules in FreePBX.  And the issue was still there.  I then did more searching for a resolution to this issue and found the above KB.
 
Doesn't look like the clean install did anything to fix it.  The issue is probably rooted in an Asterisk update.  This is the original USB image that I installed several months ago, and it was all working; including extension to extension voice.  Then a month or 2 ago, I noticed that this "no sound" issue had happened.  I do (well...I did) have Auto Update enabled.
by editing the rtp.conf file, and un-commenting the "include rtp_additional.conf" line, this resolved the no sound issue.  However, the FreePBX system is giving a Security Warning: Module: "Core", File: "/var/www/html/admin/modules/core/etc/rtp.conf altered".
 
I have run "fwconsole ma refreshsignatures" to fix this, but it just downloads a new rtp.conf file, with the same issue.
 
I do not see any other mentions of this currently happening with other installs.  That seems strange.  Please advise.  Thank you.