Ricoh D072 Service Manual page 606

Modem setting for reception
Sets the modem type for reception. The default is "0100" (V27ter, V29, V17).
Bit 7
0
0
4-7
0
0
0
*V34 is not supported for IP-Fax communication.
SM Appendix
Bit 6 Bit 5
0 0
0 1
0 1
1 0
1 0
7-67
Bit Switches
Bit 4
1 V27ter
0 V27ter, V29
V27ter, V29, V33
1
(invalid)
0 V27ter, V29, V17
V27ter, V29, V17,
1
V34*
D067/D068/D069/D072