Refer to the user guide for any endpoints supporting this capability; for example, the Avaya 3901, 3902, 3903, and 3904 Digital Deskphones User Guide includes a section Change a Feature Key label (M3902)
for the 3902, and Change a Feature Key label (M3903 and M3904)
for the 3903 and 3904. The procedures are similar, but not identical.