hallo!
syntax error in dial plan? did you test with "dialplan test"?
your isp is working well? ping to sip.betamaxclone.com is "pinging"?
did you try to "reboot" your sip device?
which betamax clone?
edit:
did you test using some betamaxclone windows client?
i am using voipbuster and voipcheap - until now all is working O.K. last call for 5 minutes!
i am in vienna, austria to. isp is chello.at.
... ah ja - and i am *premium* user*!
regards,
fla