Outboung google not working

I am in the middle of testing a system. First time for me so take it easy on me plz.
I am having a problem that I can get google voice to work incoming and can pick up a call at my extension. But when I pick up my extension I just get a busy signal and can’t get an outgoing call. Not sure what is up.Any ideas please let me know. I did let freepbx set up outgoing trunks when I installed it.
Yosef Guttman