ForwardSlashTech,
There is nothing special about the UC 360 programming versus any other generic SIP Device except you need to make sure it has 4 call paths. Other than that it just needs a good secure username and password.
What you could try is setting the username and password to be the extension in the system and the UC 360 and see if that works. If it does then you just need to go in and change the password to something more secure.
Also, you may want to make sure the UC 360 is at the latest firmware version. I seem to remember there was a version that didn't like long complicated passwords, but I can't remember what version it was.
Thanks,
TE