Asterisk - All circuits are busy now, try your call again


I have Asterisk @ home on one computer and a Sipura Phone Adapter. I’ve a FWD account and a VoIP service provider.

When I dial using Sipura Phone adapter, everything works ok, but when try to dial from Asterisk @ home, always get message “All circuits are busy now, please tr your call again later.”

I am trying to find the reason for this problem for some days but couldn’t fine it. I know that much that problem is with my configuraion. Please somebody help me how to fix it, what am I doing wrong.