During A Call - CipherLab RS31 Reference Manual

5.2.3. DURING A CALL

When a call is connected, the phone keypad features the following buttons:
Button Description
Opens the dial pad.
Turns on the speaker.
Mutes the call.
Places the call on hold.
Add call: Adds another person to the call.
Start/Stop recording: Record this conversation to your
device's internal storage/PhoneRecord as *.3gp file.
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Using the PHONE