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Yealink
Yealink T19P E2, T41P, T42G, T46G, T48G, T41S, T42S, T46S, T48S, T52S, T54S, T53, T53W, T54W, T57W manual
D. Operation
1. Basic Functions
1. Basic Functions
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2. Adding an extension
1.1 Overview of Keys