Panasonic KX-TD500 User Manual page 247

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• If "Do Not Disturb (DND)" feature is set at the called extension, you hear DND tone.
In this case, to execute OHCA, you must first activate "Do Not Disturb (DND)
Override" feature before OHCA is available.
• Call Waiting
This feature is only effective if the called extension has set "Call Waiting" feature.
If not, you will hear a reorder tone after dialing 1.
PT(ICM)
• This feature works when the other extension is in off-hook status and the
INTERCOM button is idle/lit in green.
PT(DN)
• BSS, OHCA and Whisper OHCA do not function at a DN type PT.
• Distinctive Dial Tone
Distinctive Dial Tone is sent to the user on the extension with this feature when the
extension user goes off-hook.
Programming References
• System Programming — Installation Manual, Section 4
4.2.2 System - Numbering Plan
4.2.3 System - Class of Service
Feature References
Busy Station Signaling (BSS)
Call Waiting
Off-Hook Call Announcement (OHCA), Whisper
4-132
Station Features and Operation
4.3 Station Features and Operation
— (45) Call Waiting Set/Cancel
— Off-Hook Call Announcement (OHCA)