Panasonic KX-NS500 - Page 319

• If "MFC-R2" is selected as the Dial Mode, the PBX always sends a dial tone, instead of the telephone
company, when making a trunk call using E1 line.
PC Programming Manual References
9.32 PBX Configuration
—[1-1] Configuration—Slot—Port Property—E1 Port
Feature Guide 319
2.29.1 E1 Line Service