you have subscribed to a DRPD (Distinctive Ring Pattern Detection) service with your telephone company. This service assigns two or more telephone numbers with distinctive ring patterns to a single telephone line, allowing you to have a fax number (s) and a telephone number(s) using only one telephone line. Your machine will automatically montior incoming calls and based on the ring pattern, will let you know if the call is a fax or voice call.
Make sure the subaddress and/or password match the settings on the other party's fax machine . Before polling another fax machine, be sure to read the following: The machine can only poll fax machines that support polling.