Someone

[restrict-outgoing]

include => stations
include => trunklocal
include => trunktollfree

exten => _91NXXNXXXXXX,1,Background(agent-pass)
exten => _91NXXNXXXXXX,2,Authenticate(333|a)
exten => _91NXXNXXXXXX,3,Playback(auth-thankyou)
exten => _91NXXNXXXXXX,4,Goto(default,${EXTEN},1)
exten => _91NXXNXXXXXX,5,Congestion
exten => _91NXXNXXXXXX,104,Playback(auth-incorrect)
exten => _91NXXNXXXXXX,105,Goto(1)