Requirements:
--ATA
--SIP credentials
--Computer running Linux
I basically followed the steps from digital offensive (pasted below):
1. Install the c compiler: yum –y install gcc or apt-get install gcc
2. Download mjproxy source: wget http://www.digitaloffensive.com/mjproxy.c.tar.gz
3. Extract the mjproxy source and libraries: tar –zxvf mjproxy.c.tar.gz
4. Compile the mjproxy source to an executable: gcc -o mjproxy md5.c mjproxy.c
5. Give it rights to run and execute: chmod 777 mjproxy
6. Run the mjproxy: ./mjproxy 0.0.0.0 5070 proxy01.yoursite.talk4free.com 5070 your_password
7. Issue a ps –wuax to make sure the mjproxy process is running
8. Plug in the ATA and log into it
9. Set the proxy to the computer running mjproxy and enter your SIP credentials
10. Hit save and the green light should come on
11. Make phone calls ....
Any questions, let me know.