There have been multiple FreePBX Plugin module over time. The current one is Chan_SCCP GUI Manager for FreePBX also called 'sccp_manager'.
sccp_manager requires PHPx.x-zip to be installed (where x.x is the installed version of PHP). For example, on Debian, using PHP7.3
apt-get install PHP7.3-zip
mysql -p asterisk < /usr/src/chan-sccp/conf/mysql-v5_enum.sql
Develop. This module can be updated through module admin as modifications are made, but may still have issues
These are third-party modules, so please contact their developer if you have any questions/issues. They might need your help to update / fix and maintain, give them a shout.
Obsolete/Old Plugin Modules.