MSI MICRO ATX EX7 Manual page 45

The JMODEM1 connector is for used with Modem add-on card that
supports the Modem Wake Up function. To use this function, you need to
set the "Resume By Ring" to enable at the BIOS Power Management Setup.
1
JMODEM1
Note: Modem wake-up signal is active "low".
Note: To be able to use this function, you need a power supply that
provide enough power for this feature.
(750 ma power supply with 5V Stand-by)
5
PIN
1
2
3
4
5
SIGNAL
NC
GND
MDM_WAKEUP
NC
5VSB
2-41