User’s manual
AT&T Marathon™
Cordless Headset
Table of contents
Getting started
Quick reference guide -
headset ......................................... 1
Headset indicator lights ....... 1
Alert tones ...................................... 3
Headset alert tones ................ 3
Quick reference guide -
headset base ............................. 4
Headset base indicator
lights .............................................. 6
Installation ...................................... 7
Battery installation ..................... 8
Installation preparation ........ 9
Battery charging .........................10
No lifter mode or
lifter mode .................................11
Cord labels .................................12
Digital subscriber line
(DSL) ..............................................12
Installation options ................13
Option 1: Headset base
with corded or cordless
phone installation ..................14
Option 2: Headset base
stand-alone installation ......15
Option 3: Headset base
with corded phone for
multiple line
system or
digital business system
installation .................................... 16
Adjust the lifter audio ..........17
Adding and registering
a headset....................................18
Registration options ..............18
Option 1: To register a
previously deregistered
Marathon headset to the
headset base ............................19
Option 2: To register the
headset to an AT&T DECT
6.0 cordless telephone
base ...............................................20
Deregistering a headset ........21
To deregister the headset
from the headset base ........21
Headset attachments ...............22
Over the ear hook ..................22
Over the head band ..............25
Behind the neck band ..........27
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