Panasonic KX-NCP500 Features Manual page 146

1.9.5 Walking COS
Feature Guide References
1.17.6 Direct Inward System Access (DISA)
2.2.1 Class of Service (COS)
User Manual References
1.2.7 Calling without Restrictions
1.2.9 Setting Your Telephone from Another Extension or through DISA (Remote Setting)
146 Feature Guide