Executive busy override. Eight extension ringing assignable Broadcast. Twin routes 3 section OGM (DISA) Self-extension number confirmation. Pulse and tone mode setting Polarity Reverse Detection. Outside ( CO ) Line Duration Time Limit Monitor voice record. Various Outside ( CO ) Line Access Mode Selection. Extension number assignable freewill ( 2, 3 or 4 digits). Party Conference ( between 2 extensions and 2 CO line ). Extension ring by turns Hot line ( call to operator by lifts handset without dialing), Call to operator by one touch dialing Ring back on busy. Speed dialing and External music on hold socket & Extension outgoing call class. Remote program