NEC Univerge SV8100 - Page 245

UNIVERGE SV8100 Issue 10.1
Programming Manual 2 - 209
752 (AU) + 04 must be undefined by dialing 852(OT) / 752 (AU) + 000 before it
can be programmed as a Voice Over key by dialing 851(OT)/ 751 (AU) + 48.
Feature Cross Reference
 Refer to Function Number List.