Telematrix SP400 - Manual (Page 26)

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Speaker Line Indicators
When the “SPEAKER” key is acti-
vated, the in-use light illuminates
steadily RED above the “SPEAKER”
key.
Headset Key Indicators
When the “HEADSET ON/OFF” key
is activated, the Headset indicator will
be steadily RED.
Hold Key Indicators
When the “HOLD” key is activated,
the light above the HOLD KEY will be
steadily RED.