Microsoft EA900 - Manual (Page 32)

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Appendix B: Connector Pin-out
The ADSL modem is equipped with a RJ-11 jack for connection to the
ADSL data port. The center two pins, pins 2 and 3, are used for ADSL
data. For the modem to make a proper ADSL connection, the installed
ADSL data port should also use pins 2 and 3 for data. If the ADSL data
port installation uses pins 1 and 4 for data, then a wiring converter will
be required. Do not alter or remove the wiring converter if present.
Consult with your ADSL provider before attempting any wiring changes.