NEC Univerge SV8100 Features And Specifications Manual page 696

Issue 7.0
To change the way your Intercom call signals the extension you are calling:
1. Dial 1.
If ringing, your call voice-announces. If voice-announced, your call starts to ring the destination. This option is

also available at single line telephones.
2 - 668 Handsfree Answerback/Forced Intercom Ringing
UNIVERGE SV8100