Mitel 6970 Quick Reference Manual page 8

who are at a distance from the conference phone. Ensure that the extension microphones
are at least 7 feet (2.1 meters) away from the phone. See the Mitel 6970 IP Conference
Phone User Guide for optimal microphones placement recommendations.
3. You can mute and unmute a call using the extension microphone by alternately
pressing the Mute button on the microphone.
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