Supra-3000 doesn't dial number?

I set up my supra-3000 with this link (http://www.freepbx.org/support/documentation/howtos/howto-linksys-spa-3102-sipura-spa-3000-freepbx) and I can receive call from phone line. When I enter phone to call, 8099707044, the supra take line, I listen tone like when I pick up the line, but nothing more. Any body can help me, I very didn’t understand…

Marc