Problem setting up outgoing calls

Hi,

i have just installed freepbx and asterisk on a virtual machine.

Asterisk 1.6.2.11
FreePBX 2.8.1.4

I can call from one internal phone to another internal phone. I cannot call to an external number. I keep getting this message: "You are not allowed to dial this number"
I have configured a sip trunk for my outgoing calls with 3StarsNet and an outbound route with just one pattern: “.”

Sip registry info from asterisk info module says this:

Host dnsmgr Username Refresh State Reg.Time
sip.3starsnet.com:5060 N 015xxxxxx 105 Registered Wed, 01 Feb 2012 16:20:36
1 SIP registrations.

What can still be wrong in my configuration? Note that i am able to use this sip account without asterisk, so directly configured on a voip phone.

Thanks in advance.