Panasonic KX-TDA15 Features Manual page 176

1.15 Optional Device Features
3.8.8 [2-6-1] Numbering Plan—Main—Features—Doorphone Call
3.8.11 [2-7-1] Class of Service—COS Settings—TRS—TRS Level—Day, Lunch, Break, Night
3.8.15 [2-8-2] Ring Tone Patterns—Call from Doorphone
3.8.17 [2-9] System Options—Option 3—Confirmation Tone—Tone 1 : Doorphone / Called by Voice
3.11.1 [5-1] Doorphone
PT Programming Manual
[720] Doorphone Call Destination
[729] Doorphone Number Reference
User Manual References
1.9.1 If a Doorphone/Door Opener is Connected
176 Feature Guide