AT&T ML17939 User Manual

Getting started
8
Data port
If you want to connect another device (such as a modem or fax machine) to
the wall jack, use the jack labeled DATA on the back of the telephone base.
The data port uses line 2 only.
DATA port

AT&T ML17939 Specifications

General

Brand	AT&T
Model	ML17939
Category	Telephone
Language	English