This type of feature key is used with IP500 control units and is a mandatory item. The control
unit must be fitted with one of these feature keys even if no licenses are being used.
The serial number for licenses issued for use with this type of feature key is printed on the card
and prefixed by SN.
· A-Law or Mu-Law
PCM (Pulse Code Modulation) is a method for encoding voice as data. In telephony, two
methods PCM encoding are widely used, A-law and Mu-law (also called U-law). Typically
Mu-law is used in North America and a few other locations while A-law by the rest of the
world. As well as setting the correct PCM encoding for the region, the A-Law or Mu-Law
setting of an IP Office system when it is first started affects a wide range of regional
defaults relating to line settings and other values.
· For IP400 IP Office systems, each control units was manufactured as either an A-Law
variant or a Mu-Law variant.
· For IP500 and IP500v2 systems, the encoding default is set by the type of Feature
Key installed when the system is first started.
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