yes its simple, sip trunk and route in the ipo with the addressing required , short code(exactly the same if you are linking two ipo that are not in scn enviroment)
Sip trunk group in cm(corresponding with below, on page 2 set to unk-unk, on page 3 set format to private)
Sip Sig Group in CM(corresponding to trunk group)
ch features aar access code(if you invoke udp the aar access code will not be required to be dialled)
Dial plan ana aar for your ipo extns code Use UDP/AAR table to define your route.
Private unknown numbering plan extension length etc.
route pattern corresponding to trunk group(ensure the type corresponds with the unk-unk set on trunk group)
Test
APSS (SME)
ACSS (SME)
