2
The following features correspond to the numbers in Figure 1.
Headsets
On all of the 6400 Series telephones

except

the 6416D+M and 6424D+M, the
headset connection consists of a headpiece (shown as 1 in Figure 2 below)
and modular base unit (shown as 2 in Figure 2). In this instance, the base unit
plugs into the Handset jack (shown as 3 in Figure 2).
FIGURE 2 The Headset Attached to the Handset Jack on a 6400 Series
Telephone (via a Modular Base Unit)
On the 6416D+M and 6424D+M sets, there is a jack provided for ONLY the
headset. In Figure 3, the headset is shown as 1; the Headset jack is shown
as 2. On these sets, the headset can

either

be connected, with an adapter cord
(shown as 3 in Figure 3), to the Headset jack on the back of the telephone
or
connected to a modular base unit which then plugs into the Headset jack.
1) Mute button 8) Display — available only on the
6408D+, 6416D+ and 6416D+M, and
the 6424D+ and 6424D+M
2) Speaker button 9) Softkeys
3) Transfer/Test button 10) Display control buttons
4) Redial button 11) Hold button
5) Conf/Ring button 12) Call appearance/feature buttons
6) Dial pad 13) Message light — labeled
7) Volume control button 14) Tray handle
7
321
4

*

56
89
O#
Volume
12
3