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The 420 system can support up to 12 extensions and 15 lines. This is possible by using line 4
for line groups. This allows additional lines to be shared by extensions. The 420 must be
programmed for line groups for the system functions to operate properly. The chart below
describes a typical line group application using eight lines.
PROGRAMMING OPTIONSPROGRAMMING OPTIONS
PROGRAMMING LINE GROUPS / PRIVATE LINE
L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12 L13 L14 L15
EXT 11 ●●●PRV
EXT 12 ●●● PRV
EXT 13 ●●● PRV
EXT 14 ●●● PRV
EXT 15 ●●● PRV
EXT 16 ●●● PRV
EXT 17 ●●● PRV
EXT 18 ●●● PRV
EXT 19 ●●● PRV
EXT 20 ●●● PRV
EXT 21 ●●● PRV
EXT 22 ●●● PRV
Calls can only be transferred between extensions sharing the same line group. Line 7 and 8 are
private and calls cannot be transferred to any other extension.
Department Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Line 7 Line 8
Reception EXT 11 ●●●●
Sales EXT 12 ●●● ●
EXT 13 ●●● ●
EXT 14 ●●● ●
Credit EXT 15 ●●● ●
EXT 16 ●●● ●
EXT 17 ●●● ●
Warehouse EXT 18 ●●● ●
EXT 19 ●●● ●
EXT 20 ●●● ●
Vice President EXT 21 ●●● PRV
President EXT 22 ●●● PRV
PROGRAMMING LINE GROUPS / PRIVATE LINE (cont.)
1.While in the PROGRAM mode, press the
▼ button until the following screen
appears:
LINE GROUP
▲▼: select
: enter
▲
LINE GROUP
= L04
▲▼: select
SAVE?
2.Press the button to enter.
3.Use the ▲▼ buttons to change the LINE
GROUP.
LINE GROUP
= L05
▲▼: select
SAVE?
LINE GROUP
= L05
Programmed!
4.Press SAVE to accept the setting.
SETTING AUTO-MUTE
When set to ON, the auto-mute feature automatically mutes the microphone of an extension
receiving a paging call. Setting this feature to OFF allows the paging party to immediately hear
the paged extension. This setting is useful as a ROOM MONITOR and for automatic hands free
communication. See PAGING A SINGLE EXTENSION on page 28.
1.While in the PROGRAM mode, press the
▼ button until the following screen
appears:
AUTO-MUTE
▲▼: select
: enter
▲
AUTO-MUTE
= On
▲▼: select
SAVE?
2.Press the button to enter.
3.Use the ▲▼ buttons to change the
setting.
AUTO-MUTE
= Off
▲▼: select
SAVE?
AUTO-MATE
= Off
Programmed!
4.Press SAVE to accept the setting.
PROGRAMMING
PROGRAMMING
● = Line Connected PRV = Private Line
The chart below describes a system where all extensions have a private 4
th
line.
AUTO INTERCOM ANSWER
If auto-mute of one extension is set to OFF and it receives a page from another extension, the
page call becomes an automatically answered intercom call.