Asterisk Place Call on Hold

;Features.conf

[applicationmap] 
place_call_on_hold => *25,caller,Goto(holding,${CHANNEL(name):4:1},1)
pickup_call_on_hold => *50,caller,Goto(holding,${CHANNEL(name):4:1},2)

;Extensions.conf

[holding]

exten => 1,1,Park(701)
exten => 1,2,ParkedCall(701)

exten => 2,1,Park(702)
exten => 2,2,ParkedCall(702)

exten => 3,1,Park(703)
exten => 3,2,ParkedCall(703)

exten => 4,1,Park(704)
exten => 4,2,ParkedCall(704)

exten => 5,1,Park(705)
exten => 5,2,ParkedCall(705)