i have trixbox on payed server, need create sip trunk from mobile phone

[zlotowinfo]

buyed server & used trixbox openvz image
http://flashmirrors.com/files/axev9tmzskxjpqd/trixbox-2.6-x86.tar.gz#318MB

have lot cash on mobile

wishes to create sip trunk for conect to asterisk
1. when i at home, conecting mobile to computer
2. start some software
3. asterisk will connect automaticaly when see trunk as online & will use it

where is problem?
what mobile & what software can be used (heard about 3cx)