Develop FK-506 User Manual page 263

Utility mode/Fax mode parameters
3
Use the keypad to type in the number of rings, and then press the [OK]
key.
– The number of rings can be set between 1 and 16.
The "FAX RX OPERATION" menu appears again.
FK-506
NO. of RINGS
2(1-16)
6
6-81