Panasonic KX-TDA30 Features Manual page 300

1.25 Portable Station (PS) Features
2.10.1 [4-1-1] Wired Extension—Extension Settings—Main—Wireless XDP
PT Programming Manual
[515] Wireless XDP Parallel Mode for Paired Telephone
Feature Guide References
1.11.9 Parallelled Telephone
2.2.1 Class of Service (COS)
User Manual References
1.8.12 Using Your PS in Parallel with a Wired Telephone (Wireless XDP Parallel Mode)
300 Feature Guide