Busy extension

You call an extension and receive busy tone.

Camp-on

You can notify a busy extension of your call by a muted ringing call.

Press to camp-on.

Keep the handset off hook. When the called extension replaces the handset, it will be called automatically.

Notes:

If you receive the busy tone again, the desired extension does not allow Camp-on.

The number for Camp-on may differ from country to country, see table Alternative programming for Automatic Callback, Camp-on, Intrusion.

Intrusion

You can intrude on an ongoing call on a busy extension (if this function is allowed).

Press to intrude.

Intrusion tone is heard and a three-party call is established. When the called extension replaces the handset and you keep off hook, the called extension will be recalled automatically.

Notes:

If you still hear the busy tone, your extension does not have the authority to intrude or the desired extension is protected against Intrusion.

The number for Intrusion may differ from country to country, see table Alternative programming for Automatic Callback, Camp-on, Intrusion.