During A Call - CipherLab RS51 Reference Manual

5.2.3. DURING A CALL

When a call is connected, the phone keypad features the following buttons:
Button
Mute: Mutes the call.
Keypad: Opens the keypad.
Speaker: Turns on the speaker.
Add call: Adds another person to the call.
Hold: Places the call on hold.
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Description
Using the PHONE