Panasonic DBS 576 HD Technical Manual page 158

Chapter 7. SLT Features
Figure 2. Example Directory Number assignments for Extension 200
When a caller originates a call, the call appears on the first available PDN key. If all PDNs are
unavailable, the call will select the EXT LED.
When calls come in to a DN, the call appears on the first available DN key. If the call is to your PDN
and no PDN key is available, the caller hears a busy tone.
Directory numbers may be assigned to FF keys 25-32. These are non-appearing keys.
Intercom voice calls only go to the PDN extension but light the corresponding NPDN keys red. A tone
call follows the appropriate ring status (immediate ring, delayed ring, etc.) for any extension.
5-36 DBS 576HD (USA) issued September 2001
Section 700 - Operation
576-50-700