Your telephone system administrator assigns features to your feature keys, and provides you with passwords and other codes as required. One of the codes provided by the administrator is the Special Prefix Code (SPRE) which you need in order to use some features. For other features, the SPRE is optional. There are three models of Meridian Digital Telephone. The M2006 has six feature keys. The M2008 has eight feature keys, and the M2008HF includes a built-in microphone. The M2616, shown below, has 16 feature keys and also includes a builtin microphone.
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