asterisk users - Jul 2005 - Voipjet test account - unable to make calls.

Hi,
I just setup a VoipJet test account (one with 25c credit) to test,
they seem to offer
good rates to 02 Uk mobiles :)

Anyway, everything went ok, iax.conf amended and extensions.conf too,
however when I
try to make a call I see:-

rt*CLI> 
    -- Executing SetCallerID("SIP/2008-d747", "4153574000")
in new stack
    -- Executing Dial("SIP/2008-d747",
"IAX2/4415@voipjet/01144524592060") in new stack
    -- Called 4415@voipjet/01144524592060
Jul 17 17:04:37 WARNING[31624]: chan_iax2.c:5553 socket_read: Call
rejected by 66.246.220.19: No authority found
    -- Hungup 'IAX2/voipjet/1'
  == No one is available to answer at this time


Do these accounts take a while to become 'active' ? I think it's
about
1 hour now since I set it up.

Thanks
Mike