Panasonic KX-TDA15 Features Manual page 283

1.22 Administrative Information Features
Feature Guide References
1.1.1.3 Direct Inward Dialling (DID)/Direct Dialling In (DDI)
1.1.1.4 Multiple Subscriber Number (MSN) Ringing Service
1.2.2.7 Log-in/Log-out
1.5.4.7 Host PBX Access Code (Access Code to the Telephone Company from a Host PBX)
1.11.1 Call Transfer
1.15.6 Direct Inward System Access (DISA)
1.26.1 TIE Line Service
2.2.1 Class of Service (COS)
3.1 Capacity of System Resources
Feature Guide 283