4. PBX Systems
General Call
Consultation
Programmable
Line
Line
Line
MWL_OFF
Mailbox
Callback
-
+
Indicator
s
Feature Ke
y
s
Display
03
02
01
00
11
10
09
08
07
06
04
05
Programmable
Programmable
MWL_ON
Figure 6. Siemens Optiset E Telephone with the Hicom 300 4.3.3. Programmable Feature Keys As illustrated in Figure 5 and Figure 6 , there are 12 Programmable Feature Keys located below the display on the Optiset E telephone. These keys can be configured either during PBX installation or by the user (using the telephone set or the Dialogic® PBX Integration Board). There is an LED indicator