[asterisk-users] Help with dial plan

[James Mutuku]

Hi list,

Have installed trixbox and I am working with a fxo gateway to get fxo 
calls to trixbox. I am using sip to send the calls from the gateway to 
trixbox. I have an extension 3000 on trixbox

on [from-sip-external] on extensions.conf ,I have put the dial plan below.

exten => 3000,1,dial(sip/3000)
exten=> 3000,2,answer()
exten => 3000,3,congestion()
exten=> 3000,4,hangup()


this works fine. But I when I put it in the form

exten => _3XXX,1,dial(sip/${EXTEN})
exten=> _3XXX,2,answer()
exten =>_3XXX,3,congestion()
exten=> _3XXX,4,hangup()

the call goes into congestion and I get a busy tone. What could I be 
doing wrong?

James
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