The V-9988 USB message on hold device eliminates time limitations and provides an infinite opportunity for continuous background music or messages. The digital message on hold systems supports the MP3 playback without any special drivers or software. Page 3: Background Music Mounting The V-2001A was designed for wall or table mounting. Secure unit to wall studs or a suitable brace away from heat sources or strong magnetic fields (Motors, fans, power supplies, etc.) with the control and terminal strip accessible. Valcom V-2924A. The V-2924A provides 24 stations of handsfree intercom with one-way group call and all call. Up to three expansion units may be connected to provide 48, 72, or 96 zones of paging with handsfree reply, up to 16 one-way page groups, and all call.