The 12-Button and 48-Button Programmable Key Modules (PKMs) extend the capabilities of the Mitel 5324 IP Phone and
5224 IP Phone with additional LED indicators and 12, 48 or up to 96 additional buttons. The IP PKM Interface Module
added to an IP phone allows the IP PKM 12 or 48 to be easily connected to the IP phone without an additional LAN port.
The additional personal keys can be programmed as feature keys, speed call keys, Direct Station Select (DSS) keys,
or line appearance keys. Each has a line status indicator that works the same way as those on the associated telephone.
They can be programmed easily through the telephone or by the system administrator.