From within the security tab in EPST replace the top and 2nd box with yourtendigit@uscc.net
And the 2nd box and 4th box with: yourtendigit
So if you number was 702-865-8859 it would look like this:
1) 7028658859@uscc.net
2) 7028658859
3) 7028658859@uscc.net
4) 7028658859