Could i integrate a CUE 3.1.1 with a CUCM 6.1.2??, i found at Cisco that they are not compatible, however i could do it in the practice, does not??
As you stated, this is not compatible according to the matrix here...
Now, can you try to put it together in a lab, sure. Will anything be supported or will TAC troubleshoot anything? No. Also, the reason this is not compatible in the matrix is because it was already tested so, depending, on what you are trying to do on this lab/integration, it might be a lost cause or it was tried already by BU. Either way, you are free to try but it has already been tested by our BU as not being compatible for whatever reason and it is not supported by Cisco.