Pitney Bowes Mailstation 2 Operator's Manual page 6

Industry Canada
This product meets the applicable Industry Canada technical specifications.
The Ringer Equivalence Number (REN) is an indication of the maximum
number of devices allowed to be connected to a telephone interface. The
Ringer Equivalence Number (REN) of this terminal equipment is 1.0 (with the
exception of the K7M0, which is 0.3). The termination on an interface may
consist of any combination of devices subject only to the requirement that
the sum of the RENs of all devices does not exceed five.
The abbreviation, IC, before the registration number signifies that registration
was performed based on a Declaration of Conformity indicating that Industry
Canada technical specifications were met. It does not imply that Industry
Canada approved the equipment.