NEC Univerge SV8100 Features And Specifications Manual page 605

UNIVERGE SV8100 Issue 1.0
Operation
To place an intercom call using Hot Key-Pad:
The multiline terminal is idle. No need to press speaker key.
Dial the extension.
Dialed extension rings.
To place a trunk call using Hot Key-Pad:
The multiline terminal is idle. No need to press speaker key.
Dial the trunk access code, 9 by default, and the external destination number you wish to call.
SV8100 Features and Specifications Manual 2 - 581