Cisco 7941 registration issues with VOIP.MS

[wyattpacli]

Recently, I've been attempting to register my 7941 with VOIP.MS. The phone receives the config files fine, and all the configuration loads. But the phone seems to get stuck in a loop of "registering" and "restarting".  Attached are all 3 config files I'm using. Can anybody tell me what the issue is and how to fix it? There's no errors with the config files that I am aware of. Please let me know if there is any more information that I need to provide.

[Leo Laohoo]

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@wyattpacli wrote:
<natEnabled>true</natEnabled>
<natAddress></natAddress>
<proxyServerURL>proxy:3128</proxyServerURL>

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What are these lines for?  

Is NAT enabled in the network? 

Is ALG enabled?

[wyattpacli]

I got this config file from another website, so I couldn't tell you what those lines are for. NAT and ALG is enabled in the network, but SIP ALG is disabled.

[wyattpacli]

Here are the status messages as well.

[Leo Laohoo · Accepted solution]

Disable SIP ALG on the network.
Disable NAT on the network and phone settings. 
Remove the option about proxy.