[macro-dial-vp]
exten => s,1,AGI(call_log.agi)
exten => s,2,SetCallerID("foo" <16505551212>)
exten => s,3,Dial(${TRUNK_IAX_VP1}/1650${MACRO_EXTEN})
exten => s,4,Congestion
exten => s,103,Dial(${TRUNK_IAX_VP2}/1650${MACRO_EXTEN})
exten => s,104,Congestion
exten => s,204,Busy

[outbound-local]
exten => _NXXXXXX,1,Macro(dial-vp)
exten => _1650NXXXXXX,1,Macro(dial-vp)