Yealink SIP-T20 - Manual (Page 7)

About This Guide
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Major updates have occurred to the following sections:

Keypad Lock on page 21
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Volume on page 24
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Ring Tones on page 24
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Call Completion on page 59
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DSS Keys on page 37
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Do Not Disturb (DND) on page 61
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Call Forward on page 64
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Busy Lamp Field (BLF) on page 79