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ISDN 8503T Voice Terminal
ROM cartridge
A ROM cartridge is installed in each voice terminal, but is easily removed and replaced so that
the firmware can always be updated. The cartridge can be removed from the bottom of the hous-
ing by pressing the tab on the cartridge and then lifting it from the housing. The cartridge can be
inserted into the housing by pressing the tab on the cartridge and then pressing it down into the
bottom of the housing.
Mounting Options
The 8503T voice terminal comes equipped with a desk stand. However, the desk stand can be
removed, and the voice terminal can be mounted on the wall.
Color
The 8503T voice terminal is available in AT&T black or AT&T white.
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