Panasonic KX-TDA15 Features Manual page 301

3.8.17 [2-9] System Options—Option 3
→ Confirmation Tone—Tone 1 : Doorphone / Called by Voice
→ Confirmation Tone—Tone 2 : Paged / Automatic Answer
→ Confirmation Tone—Tone 3-1 : Start Talking after making call
→ Confirmation Tone—Tone 3-2 : Start Talking after answering call
→ Confirmation Tone—Tone 4-1 : Start Conference
→ Confirmation Tone—Tone 4-2 : Finish Conference
→ Confirmation Tone—Tone 5 : Hold
PT Programming Manual
None
1.25 Audible Tone Features
Feature Guide 301