System → Handset Settings → Programmable Keys → Line Key Settings → Line Key 3 → Type
User Settings → Progrm'able key → Line key → L3 Type
<hs_settings>
<idx id="x">
<pfk>
<line3>
<feature>VALIDVALUE</feature>
</line3>
</pfk>
</idx>
</hs_settings>
Programmable feature type on handset (L3 key).
unassigned, keyline, line, call list, dir, call log, redial, messages, dnd, cfwd all, cfwd busy, cfwd no answer
keyline