GAI-Tronics IPE2500A, IPE2500A-MLS Paging Encoder / Desktop Controller User and Installatoin Manual - Manual (Page 52)

Installation IPE2500A and IPE2500A-MLS Paging Encoder/Desktop Controller
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The diagram below illustrates which buttons to press to access the programming menu features.
Press: To program:
PB1
Line Output Adjust Default: −10 dB
PB2
Line Input Sensitivity Default: −9 dB
PB3
Internal Diagnostics:
Press: To program:
PB1
Relay Module Diagnostics
or
Line Select Module Diagnostics
(depending on board installed)
PB2
DC Module Diagnostics
PB3
RS-232 Diagnostics
PB4
Keyboard Diagnostics
PB4
Tone Level Adjust
Press: To program:
PB1
Sidetone Level Adjust Default: 0 dBm
PB2
Alert Tone Level Adjust Default: 0 dBm
PB3
Page Level Adjust Default: 0 dBm
CTL+PB1
Toggle Compressors
Press: To program:
PB1 Toggle Microphone Compressor On/Off
PB2 Toggle Receive Compressor On/Off