How can i configure, when the call goes to unity connection voice mail, to not make the woman say "Sorry, .... is not available" and only play the custom message that i recorded on the phone.
Search Call Handlers > Edit Call Handler Basics (AA) > Greetings > Edit Greeting (Standard)
If you have any locale other than US English enabled, check that the custom greeting is flagged as the correct language. Also check in user settings under "Message Settings", check what's selected under "Language that Callers Hear". If the languages don't match the custom greeting will be ignored.