Step 1: Start mjproxy
mjproxy 192.168.2.100 5070 proxy01.yourcity.talk4free.com 5070 MJ_password
Since I have a dedicated IP behind my router, I've used that (192.168.2.100).
Check that it's up and running with: ps -ax
Step 2: Configure Xlite
Main Menu --> System Settings --> SIP Proxy
Enabled: Yes
Display Name: as you like
Username: EXXXXXXXXXX01
Authorization User: EXXXXXXXXXX01
Domain/Realm: IP for proxy01.yourcity.talk4free.com
SIP Proxy: proxy01.yourcity.talk4free.com:5070
Outbound Proxy: 192.168.2.100 (IP you used with mjproxy)
Just leave the other options as "Default"
Step 3 Test
Start Xlite. If your credentials are correct and your configuration as well, Xlite's display will state:
Logged In:
Your Logged In Number Is: E1234567890 (whatever your MJ number is)
Good luck and post your results