How do I factory reset an IP-VIKING E-1600 IP phone?

 In order to perform a factory reset of a Viking Electronics' E-1600 Series Emergency Phone follow these steps.
1. Dial the PABX Line connected to the E-1600 from a Touch-Tone phone.
2. If the dip switch, S2-1, is in the ON position (normal operation mode), enter the code.
3. 6-Digit Security code: 845464