Changes for release 71, guide version 71.91, Changes for release 71, guide version 71.90 – Yealink SIP-T21 User Manual

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Changes for release 71, guide version 71.91, Changes for release 71, guide version 71.90 | Yealink SIP-T21 User Manual | Page 6 / 142 Changes for release 71, guide version 71.91, Changes for release 71, guide version 71.90 | Yealink SIP-T21 User Manual | Page 6 / 142
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