Yealink SIP-T21 E2 User Manual page 154

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User Guide for the SIP-T21(P) E2 IP Phone
To register an account and configure BLA feature on phone A via web user interface:
1.
Register the account 14019833020.
2.
Click on Advanced, and then select Draft BLA from the pull-down list of Shared
Line.
3.
Enter the desired number in the BLA Number field.
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