[Asterisk-Users] transparent call routing

[Csuri]

I am trying to get transparent call routing working, but this
extensions.conf not working correctly:
exten => 200,1,Dial(zap/3/200)    ;infinite loop!!!

old config:
telco ----t1---- pbx ----t1---- win-ivr
new config:
telco ==2t1== asterisk ----t1---- pbx ----t1---- win-ivr

my dream:
on port 1,2
    if callednumber inlist(123,124...) then run mycalltree
    else route call to port 3 with same callednumber
on port 3
    if callednumber inlist(123,124...) then run mycalltree
    else route call to port 1or2 with same callednumber

Can anyone help me?