MNP 10 is an error-correction protocol that allows for more reliable data connections using cellular modems.
To establish an MNP 10 connection, your modem and the modem you're calling must support MNP 10, and you must select the "Use MNP 10 error correction in modem" checkbox in the Remote Access Setup window.
If both modems do not support MNP 10 error correction, the selection in the Setup window will do nothing.