Yealink SIP-T20 User Manual page 7

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