Change The Number of Rings Before a Call Goes to Voice Mail
 

  1. Press "Prog" under the LCD Screen
  2. Dial *#1234
  3. Dial 605
  4. Press Enter
  5. Dial your Extension number ( 101 or 102...... )
  6. Dial the time you want ( 20 sec is about 4 rings )
  7. Press Enter key
  8. Lift hand set then hang up.