Ricoh 2400L Operator's Manual page 53

TRANSMISSION
Storing the ID Code
Before programming the ID Code, confer with other users in your fax network to
agree on an ID Code. This is because communications using ID Codes will fail if
the codes are not the same.
The ID Code can be any four-digit code (using digits 0 to 9 and letters A to F),
except 0000 and FFFF.
In addition to the networking features described in this section, ID Codes are used
with the following communication features. The same code must be used by all
members of your fax network and all people you wish to communicate with using
these features.
Polling: see page 97.
Closed Network: see pages 64 and 93.
Features using ID Codes can only be used between terminals made by the same
maker.
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ADVANCED FEATURES