his macro helps to define an outbound hunting group for the outbound dialing. In the situation where you have multiple PSTN lines registered as multiple SIP channels (e.g. SIP/line1, SIP/line2, SIP/line3, etc...), on the same or multiple gateways, and you wants to arrange them into an ordered hunting group for outbound calling. You can use the following hunt-dial macro.

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[default]
include => pstn-out

[macro-hunt-dial]
; ${ARG1} channel
; ${ARG2} Dialed Number

exten => s,1,SetGroup(${ARG1}) ; increment GROUPCOUNT
exten => s,2,GetGroupCount()
exten => s,3,NoOp(GROUPCOUNT:${GROUPCOUNT})
exten => s,4,GotoIf($["${GROUPCOUNT}" = "1"]?5:6) ; if GROUPCOUNT = 1, then it's free for dialing.
exten => s,5,Dial(SIP/${ARG2}@${ARG1}) ; use it to call out.
exten => s,6,NoOp(${ARG1} is inused)


[pstn-out]
exten => _XXXXXXXX,1,Macro(hunt-dial,line1,${EXTEN}) ; list your SIP channels here in the hunting order
exten => _XXXXXXXX,n,Macro(hunt-dial,line2,${EXTEN})
exten => _XXXXXXXX,n,Macro(hunt-dial,line3,${EXTEN})
exten => _XXXXXXXX,n,Macro(hunt-dial,line4,${EXTEN})
.
.
.
exten => _XXXXXXXX,n,NoOp("No Channel available")
exten => _XXXXXXXX,n,Hangup()