NEC SL1100 Features And Specifications Manual page 521

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ISSUE 2.0
Operation
To mute your telephone handset or Handsfree microphone while on a call:
1.
Press Mute key.
To turn your telephone microphone back on:
1.
Press Mute key.
Use Mute key only if you pressed it initially to turn off your Handsfree microphone.
Features and Specifications Manual
SL1100
M
1-509

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