Music On Hold
Music is better
Most callers will hang up within a minute if there's only silence on the line. FortiVoice indicates that the line hasn't died with a default on hold beeping tone. Better yet, you can upload an audio file or attach any standard audio device to play music - a radio, CD player or MP3 player.
You're not limited to music, either. You can use any sound recording you want, including advertisements or information about your company or products. You've got a captive audience; sell yourself!