Headset use, Headset mode activation/deactivation, Headset prior – Yealink SIP-T21 User Manual

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Headset use, Headset mode activation/deactivation, Headset prior | Yealink SIP-T21 User Manual | Page 55 / 142 Headset use, Headset mode activation/deactivation, Headset prior | Yealink SIP-T21 User Manual | Page 55 / 142
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