Tone/Voice Calling - Iwatsu ENTERPRISE 5.0 Owner's Manual

Wait for a confirmation tone
Press the Speaker button SPKR
To cancel:
Press the Speaker button SPKR
Wait for the dial tone
Press the Feature button FEAT then dial
Or
Press the Time Reminder button TM REMD then dial
Wait for a confirmation tone
Press the Speaker button SPKR

TONE/VOICE CALLING

The calling mode for intercom calls may be switched between voice and
tone signaling. The ECS may be programmed to allow either the calling
party or the called party to have control of the signaling mode.
Operation
Calling party control:
Dial intercom extension number
Dial
Called party control:
Press the Feature button FEAT then dial
Or
Press the Tone button V/T if assigned as a Multipurpose button
and the lamp will be solid red
DIGITAL TELEPHONE USER GUIDE - 208