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Unity Connected Solutions – AVAYA 9621G & 9641G IP Telephones. 11. Volume: Adjusts the volume. 12. Mute: Mutes the call in progress. Press again to un-mute. 13. Speaker: Access the speakerphone feature. Press again to turn off or pick up the handset or press the Headset button. 14. Headset: Access the headset if it is connected. ................
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