Sony DT360, DT310, DT368 manual Automatic CALL-BACK, Busy Extension

OUTGOING CALLS

AUTOMATIC
CALL-BACK	You call an extension and receive busy tone or get no answer.
	Press and go ”on hook”
	Verification tone. You are called back if the extension finishes
	the ongoing call or the next time the extension finishes a new
	call. You have to answer within eight seconds otherwise the
	call-back service is cancelled.
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 (if this function is allowed).
	Press to camp on
	Keep the handset off hook. When the called extension
	replaces the handset, it will be called automatically.
	Note: If you receive the busy tone again, the desired extension
	does not allow camp-on.
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.
	Note: If you still hear the busy tone, then your extension does not
	have the authority to intrude or the desired extension is protected
	against intrusion.

BusinessPhone 250 / BusinessPhone 50	23
Portable DT310 / DT360 / DT368