Panasonic KX-TDA100

Programming Manual References
6.1 [4-1-1] Wired Extension—Extension Settings—Option 3— Charge Limit
6.10 [4-2-1] Portable Station—Extension Settings—Option 3— Charge Limit
Feature Guide References
1.26.3 Call Charge Services
766 PC Programming Manual
8.2 [6-2] Hotel & Charge