Lexmark CX920
A distinctive ring service lets you have multiple telephone numbers on one telephone line. Each telephone number is assigned a different ring pattern.
From the home screen, touch Settings > Fax > Analog Fax Setup > Fax Receive Settings > Admin Controls > Answer On.
Select the ring pattern.
Apply the changes.
Connect your mobile device to the Wi‑Fi network of the printer.
Connect your printer directly to an active telephone wall jack or share a line with an answering machine or voice mail service.