Nortel Networks 2004 - Manual (Page 136)

Accessories
136
Accessories
IP Phone Key Expansion Module (KEM)
The Nortel Networks IP Phone Key Expansion Module (KEM) is an
optional hardware module that provides additional line appearances and
feature keys on your IP Phone 2004. You can connect up to two KEMs to
your IP Phone 2004, providing a total of 48 additional keys.
For more information about the IP Phone Key Expansion Module,
consult the “Nortel Networks IP Phone Key Expansion Module (KEM)
User Guide”.