The Avaya 2500 MMGN is a basic single line desktop telephone. It features a standard numeric dial pad, volume up/down buttons, and a ringer volume control switch (Lo/Hi).
Avaya 2500 MMGN Features
Single line telephone
Dialpad
Volume up/down
Ringer volume control (Lo/Hi)
Compatibility
Compatible with analog telephone lines (POTS) or analog line ports on your PBX (FXO)
Compatible with analog station ports on your PBX (FXS)
Compatible with analog station ports (FXS) on Analog Telephone Adapters (ATA)