asterisk users - May 2012 - Why do I get call twice in one go?

I understand why do I get call twice to my mobile when I execute the
following AMI command sets:

ACTION: Originate
Channel: Local/800 at test
Timeout: 60000
Priority: 1

and my dialplan look like this:

[test]
exten => 800,1,DIAL(SIP/447xxxxxx at voip);
exten => 800,n,Hangup()


How to prevent getting called twice in one go when I execute this AMI
command?

Thanks...
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