asterisk users - May 2005 - Unable to create channel of type 'IAX2' (cause 3)

I try to connect to voipjet, but I get always busy, ... it worked 
yesterday, ... no changes on my side....




    -- Executing SetGroup("SIP/615-829b", "iax-voipjet") in
new stack
    -- Executing Dial("SIP/615-829b", 
"IAX2/17567@voipjet/011886228357765") in new stack
May 20 18:16:26 NOTICE[9733]: app_dial.c:973 dial_exec_full: Unable to 
create channel of type 'IAX2' (cause 3)
  == Everyone is busy/congested at this time (1:0/1/0)
    -- Executing Hangup("SIP/615-829b", "") in new stack
  == Spawn extension (default, 9011886228357765, 514) exited non-zero on 
'SIP/615-829b'
    -- Executing Hangup("SIP/615-829b", "") in new stack
  == Spawn extension (default, h, 1) exited non-zero on 'SIP/615-829b'



This is the extension.conf for this part:
exten => _9011Z.,413,Dial,IAX2/17567@voipjet/${EXTEN:${TRUNKMSD}} ; 
VoipJet.com NANPA
exten => _9011Z.,414,hangup

exten => _9011Z.,512,Dial,IAX2/${NUFONEUSER}@NuFone/${EXTEN:${TRUNKMSD}}
 


Should I remove the hangup line, so that it can go and try NuFone?
How can I improve this?


bye

Ronald

What does it mean? How to solve it?


-- Executing Dial("Local/9011886229xxxxxx@Line-optimize-8011,2", 
"IAX2/xxxxx@voipjet/011886229xxxxxx") in new stack
May 20 18:02:17 NOTICE[31410]: app_dial.c:973 dial_exec_full: Unable to 
create channel of type 'IAX2' (cause 3)
 == Everyone is busy/congested at this time (1:0/1/0)


bye

Ronald