Important Note - Ericsson 203 Digital User Manual

Humboldt State University owns and operates its own telephone switch,
often referred to as a PBX (Private Branch Exchange). The campus PBX
is a Model MX1, manufactured by Mitel.
The MX1 supports two kinds of signaling; digital and analog. Digital
telephones are proprietary, and are designed to take full advantage of the
rich feature set available with the MX1.
Ericsson & Aastra digital telephones are used with the MX1 telephone
switch and provide single-key access to many of the MX1 features.
The 203 instrument offers on-hook dialing, programmable function keys,
adjustable ringer tone and volume, speaker phone, and the display
feature which displays date, time, number dialed, as well as programming
information.

Important Note:

Digital and Analog telephones are NOT interchangeable.
Damage may result, either to the instrument or the
PBX if these telephones are plugged into the wrong
jack.
If unsure, please call extension 4357 for assistance.