I know it works between CME and asterisk (I had it working myself). I have seen people say it won't work between CUCM and asterisk, because of authentication and that you would therefore need a CUBE. However, have a try with a CUCM SIP Trunk, and make sure on the asterisk side you allow anonymous INVITES (i am not sure about the exact wording in asterisk), basically running SIP without authentication/registration.
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Thanks a lot dennis.
We dont need any authentication. Just a direct trunk between be3k and asterix. so the end users can be able to call each other using this trunk. The issue is, we dont have cucm, we have a BE3k.
If you are really willing to implement it, I would recommend opening a case with the PDI Helpdesk to get a proper confirmation as it is a design question.