INTRODUCTION
Busy Lamp Field (BLF) feature allows an end user, such as attendant, to monitor the hook status of a list of
users. GXP1628 supports Busy Lamp Field (BLF) feature on both Multi-Purpose Keys and Line Keys on
the phone while GXP1620/1625 supports this feature through a Line Keys. This document serves as an
end user guide on how to configure Grandstream GXP1620/1625/1628 phones for Busy Lamp Field
feature.
To learn more about GXP1620/1625/1628’s basic and advanced features, please visit link
http://www.grandstream.com/support to download the latest “GXP1620/1625/1628 Administration Guide”
and “GXP1620/1625/1628 User Guide”.
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