[macro-portables3]
exten => s,2,Set(${ARG1}=${EXTEN})
exten => s,3,Dial(Zap/3/0033${ARG1},,g)
exten => s,5,HangUp()

[office4]
exten => 201,1,Dial(Sip/201)
exten => 200,1,Dial(Sip/200)
exten => 202,1,Dial(Sip/202)
exten => 203,1,Dial(Sip/203)
exten => 208,1,Dial(IAX2/208)
exten => _006XXXXXXXX,1,ChanIsAvail(Zap/3)
exten => _006XXXXXXXX,2,Cut(PORT=AVAILCHAN,,1)
exten => _006XXXXXXXX,3,Set(FOO=${IF($[${PORT} = Zap/3]?Macro(portables3,${EXTEN:2}):Dial(Zap/4/0ww${EXTEN}))})
exten => _006XXXXXXXX,4,Exec(${FOO})