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Thanks a lot to djalqali for starting this thread and especially to bbob (but also to everyone else) for providing all the info.

I have finally started understanding how all this works (something I had been wanting to do for ages). I have set up an account with pbxes with which I set up my messagenet VOIP fixed line number so that calls are diverted to my UM+.

That's really great: I finally can divert calls from my Italian mobile number to the UM+ number through the Italian VOIP number (right now at a cost of 17 cent/min because I am using messagenet also outbound, since I did not want to activate a further account with another VOIP provider... but on the other hand it's not that bad since it's billed 1/1!).

Thanks again to all.