Ricoh AFICIO MP 8000 Operating Instructions Manual page 577

Transmission
B
Press [Option Setting].
1
C
Press [SEP Code Reception].
D
Press [OK] twice.
The standby display appears.
E
Enter the fax number of a destination or an IP-Fax destination.
F
Press [Adv.Features].
G
Make sure that [SEP Code] is selected.
H
Press [Reception SEP Code].
108