[external]
exten => _X./_00XX,1,SetCIDNum(1234567890|a)
exten => _X./_00XX,2,SetCIDName(Residence|a)
exten => _X./_00XX,3,Goto(outgoing,${EXTEN},1)

exten => _X./_49[678]X,1,SetCIDNum(123456${CALLERIDNUM}|a)
exten => _X./_49[678]X,2,SetCIDName(Company|a)
exten => _X./_49[678]X,3,Goto(outgoing,${EXTEN},1)

exten => i,1,NoOp(${CALLERIDNUM})
exten => i,2,Congestion

; calling 4049181234 gives me this:
    -- Executing Goto("SIP/30_office-3151", "external|4049181234|1") in new stack
    -- Goto (external,4049181234,1)
    -- Executing SetCIDNum("SIP/30_office-3151", "6789164973|a") in new stack
    -- Sent into invalid extension '4049181234' in context 'external' on SIP/30_office-3151
    -- Executing NoOp("SIP/30_office-3151", "6789164973") in new stack
    -- Executing Congestion("SIP/30_office-3151", "") in new stack
  == Spawn extension (external, i, 2) exited non-zero on 'SIP/30_office-3151'