I am trying to setup a Cisco 2811 with CME 4.0 to perform hairpin call transfers, specifically to my CUE module installed in the router. As I understand it this will allow the call to be transported through the CME to the CUE by concatenating the 2 SIP links (between SP - CME and CME - CUE) together so that a redirect SIP message isn''t sent to the SP to call the CUE SIP device directly. As the CUE is on a private network this isn't possible.
I have read some info on this and have done the following
explicitly disable H450.2 and H450.3 and enabled H450.12
However i haven't found an answer on how to force the hairpin routing.