Please follow this easy and hands on video to set up you call center dialer.
I hope this will allow you to send call outside of you call center. This is very easy and you can do it proper if you follow for any further help.
This video has been downloaded and processed from http://www.youtube.com
Please note i am just publishing it for an Open Source Call Centre suite, I can only help you my technical experience . I do not own IP of this tutorials. Please mail me if you want it to remove.