What is the pinout specification of the special Remote Configuration Cable used to connect the Command Port to a modem?

Modem Remote Configuration Cable:
RJ45 Command port DB25 Modem Connector (DCE)
1 nc
2 nc
3 ----------- RTS, DTR ------------>4, 20 (If required by the modem)
4<-------------- RCV --------------->3
5 --------------- XMT --------------->2
6 nc
7 nc
8<-------------- GND -------------->7