Panasonic KX-NS500 Features Manual page 231

10.8.2 PBX Configuration—[2-8-2] System—Ring Tone Patterns—Call from DOORPHONE
10.9 PBX Configuration—[2-9] System—System Options—Option 3—
by Voice
13.1 PBX Configuration—[5-1] Optional Device—Doorphone
PT Programming Manual References
[720] Doorphone Call Destination
[729] Doorphone Number Reference
User Manual References
1.11.1 If a Doorphone/Door Opener is Connected
2.18.1 Doorphone Call
Confirmation Tone—Tone 1 : Called
Feature Guide 231