Equipment and Formats
Most MOH systems are integrated into a telephone system designed for businesses via an audio jack on the telephone equipment labeled "MOH". There are also some units with built-in message on hold capabilities and units designed for small businesses without an extensive phone system.
Music and messages on hold are played using either physical or virtual media.
Today, equipment that supports physical media usually plays CDs. Some older systems may still use cassette tapes (sometimes employing endless-loops), or reel-to-reel tape players. In each case, the unit loads the media into a digital memory chip to prevent premature wearing of the mechanical parts.
Equipment that supports virtual media generally plays MP3 files. Several types of units play these files. USB Flash Drive units allow an MP3 file to be received electronically, downloaded to a flash drive and connected to the player. Ethernet based remote load units connect via the network to a remote IP address. Phone line based remote load systems allow for a connection via an analog telephone line and dialing the number belonging to the unit. For VoIP phone systems, MP3s are loaded without any equipment.
Newer technology allows MP3 files to be downloaded automatically from the internet so that messages (or interesting content in the form of news and weather, amongst many) can be changed daily. The new "Online On Hold" technology makes the older technology redundant since it requires no additional hardware. All these systems allow analog-to-digital audio storage and playback.
The newest units as of 2011 allow productions to be downloaded via the Internet or played through a USB flash drive. This allows for larger files and higher quality formats.
Read more about this topic: Music On Hold
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“At the heart of the educational process lies the child. No advances in policy, no acquisition of new equipment have their desired effect unless they are in harmony with the child, unless they are fundamentally acceptable to him.”
—Central Advisory Council for Education. Children and Their Primary Schools (Plowden Report)