; Set the account code to 'benshaw' if there is no account code given as ARG2.  Then dial out the PRI

[macro-pri-dial]
exten => s,1,SetVar(ACCOUNTCODE=${ARG2})
exten => s,n,GotoIf($[{$ARG2} != ""],n+2)
exten => s,n,SetVar(ACCOUNTCODE="benshaw")
exten => s,n,SetAccount(${ACCOUNTCODE})
exten => s,n,Dial(${BELLTRUNK}/${ARG1})
exten => s,n,Wait(5)
exten => s,n,Congestion
exten => s,n+100,Busy