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