Installation
Parts Included
The 5303 Conference Phone comprises the parts shown below. If any parts are missing, contact your authorized
Mitel Networks dealer.
Figure 1: Parts of the 5303 Conference Phone
For best performance
It is recommended that the Mitel Networks 5303 Conference Phone be used in a 15’x25’ maximum size room. Be sure to install the unit on a flat surface away from obstacles, including windows and walls. The 5303 Conference Phone works best in a quiet environment (background noise should be less than
48 dBA; for example, no more than a typical workplace noise such as a ventilator or overhead projector fan).
To Install the 5303 Conference Phone:
1Connect the long phone cord to the jack labeled with the
speaker unit icon 
on the 48 V DC Power Adapter.
3