Something

[outside]
  include => extensions ; so we can transfer inbound calls


  exten => s,1,Goto(10)
  ;exten => s,1,Wait(2) ; this may be nexcessary to collect callerid from pstn lines
  exten => s,2,NoOp(${CALLERIDNUM})
  exten => s,3,DBGet(FORWARDTO=forward/${CALLERIDNUM:-10})
  exten => s,4,NoOp(${FORWARDTO})
  exten => s,5,Dial(Local/${FORWARDTO}@default)
  ;exten => s,5,Dial(Local/${FORWARDTO}@inside)
  exten => s,6,Goto(10)

  ;exten => s,n,Dial(${PHONE1}&${PHONE2}&${PHONE3},13,t)
  exten => s,10,Dial(${PHONE3}&${PHONE1}&${PHONE2},10,Tt)
  exten => s,11,Answer
  exten => s,12,SetMusicOnHold(default)
  exten => s,13,DigitTimeout,5
  exten => s,14,ResponseTimeout,40
  ;exten => s,14,ResponseTimeout,10
  exten => s,15,Background(extra/that-tickles)
  exten => s,16,Voicemail(su105@netcal)



[extensions]
  exten => 333,1,DISA(no-password|default)