Siemens optiPoint family - Manual (Page 33)

The optiPoint signature
module.
This chip card read-and-
write module increases
your communication
security as a HiPath
4000 user. Because
only with the chip card
are you authorized to
make calls. This module
is also connected at the
right of the system
telephone and can be
combined with one addi-
tional key module.
13
Point 500 und 600.