[testing]
exten => _7XX,1,Answer
exten => _7XX,2,Wait(1)
exten => _7XX,3,ParkAndAnnounce(pbx-transfer:PARKED|7200|SIP/101|default,${E$
exten => _8XX,1,Answer
exten => _8XX,2,Wait(1)
exten => _8XX,3,ParkedCall(7${EXTEN:1})