Siemens Hicom 100 Series (110/120/125/130)

With A Display Handset Plugged Into The First Extension (Usually 20 or 200)

  1. Press Service
  2. Press Hold
  3. Dial 756
  4. Press Service
  5. Dial 9 * 0 4 *
  6. Dial The Hours (00-23) Followed By *
  7. Dial The Minutes (00-59) Followed By *
  8. Lift And Replace The Handset