NEC SV-9100 User Manual page 7

Voicemail
Personal Voicemail Greeting
To record your personal voicemail greeting
Press VMsg in your display
Press Greet
Press Gr1
Press Rec, Start recording, Press # when finished.
Main Auto Attendant Greeting
To record the main auto attendant greeting
From the Operator's telephone
Press VMsg + 72 + Instr + 001 + Rec
When finished recording Press #
Music-on-Hold
To record the built-in Music-on-Hold
From the Operator's telephone
Press Speaker + 616 + 7 + 001 (Have your music source ready to play after dialing 001)
When finished recording just hang up the handset.