I have a new SPA-525 that is not registering to our UC500 from a remote worker site. Currently, I have it wired to a SR520. Phone keeps saying downloading XML files and it cycles through several other downloading prompts. Here is my SR520 config. I have verified that the UC520 has the correct phone loads and also verified the tcp adjustment on my dialer interface. I have a 524 that registers just fine with the same setup. I have also verified the TFTP server setup on the 525, it just won't register. Any suggestions would be appreciated.