Yealink T22P Manual page 52

Enterprise IP Phone
2) Or choose Contact->Phone Call Info, enter the number in the Dial a Number, select
the line from the Outgoing Identity list. Then click the dial button to call out.
3) Or choose Contact->Phone Call Info, click the number which you want to dial out
from the call list, the phone will dial out by corresponding account.
Using the Basic Call Functions
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