I'm sorry, I did not explain properly the scenario.
I have two devices VoIP on the same LAN as the snom.
A device Record the numbers from 101 to 108, the other records the numbers 301-308.
A Call from 101 to 102 works correctly, but don't works with the call from the 301 to 302.
https://docs.google.com/file/d/0B3gYl0L7y7-dZmZfWXNrSWNBeG8/
in the attachment you can see the "401 Authentication" send from the snom.
Thanks for the support