It doesnt work for me.I dont get it why? Someone please help me here

My settings

Address : sip.actionvoip.com
Password: my password

Advanced settings

Use for telephone numbers- checked

User name: my username
Transport: auto
Outbound proxy: (blank)
Port:5060
Discover public address- checked
Loose routing- unchecked (default)
keep-alive mechanism- auto
keep-alive period- auto
Auto detect STUN- checked

when i sign in with these settings,its tries to sign in then it says Not signed in.Please help

Thank you