Ricoh fax4700l Operator's Manual page 434

ADVANCED FEATURES
Closed Network (Transmission)
This feature helps to stop you from accidentally sending a fax message to a
terminal that is outside your fax network.
The ID Codes of the communicating machines are checked. If they are not the
same, the communication is stopped.
If you are interested in this feature, change the user parameter switch 06 bit 2 to
1. (Function 63)
Note: This feature may not be reliable if you are communicating with a terminal
produced by a different manufacturer.
Cross-references
ID Codes: see page 49. Closed Network (Reception): see page 129.
TRANSMISSION
89