Chapter 5. Key Telephone Features
FF5-5: Hot Line
CPC-96, CPC-288, and CPC-576 All Versions
The System provides two methods of intercom calling:
Voice Calling: Extension calls are connected immediately, without a ringing tone.
Tone Calling: A ringing tone is sent to the called extension.
Extension Class of Service (COS) programming determines whether the default for the originating
extension is voice or tone calling. Regardless of the default, you can toggle between voice or tone
calling by entering the Tone-Voice Call feature code. For example, if the extension default is tone
calling, you can make a voice call to another extension by entering the Tone-Voice Call feature access
To make a call using Intercom Calling:
1. Lift the handset or press the ON/OFF key.
2. Dial the extension number.
3. If your extension is set for tone calling and you want to
make a voice call, enter 1.
If your extension is set for voice call and you want to make
a tone call, enter 1.
4. Speak when your call is answered.
5. Replace the handset or press the ON/OFF key.
FF1-0-03: Extension COS (Intercom Calling Type)
FF1-0-03: Extension COS (Voice Call Send)
FF1-0-03: Extension COS (Voice Call Receive)
FF3: Extension COS
DBS 576 (USA), issued January 1999
Section 700 - Operation
Intercom dial tone
• Dialed number displays
• EXT LED lights
EXT LED goes off