Remote Polycom phone update/configuration without a VPN

Question; has anyone done a setup that will automatically provision a remote 
Polycom phone with all the correct settings using FTP/TFTP?
Here’s my concept:

> Punch a hole in our firewall to allow tftp to the sipx server
> When setting up a new phone at a remote location, interrupt the boot-up and 
> add my firewall outside IP along with and change to tftp instead of using ftp.
> Setup tftp on sipx.
> Create a group on sipx for all my remote phone along with the remote phone 
> properties

I’m just wondering if this is possible because I did an “nmap –sT localhost” on 
sipx and I don’t see a port 66/69 open for tftp but I do see ftp port open.

Would the firmware be upgraded remotely to match the firmware internally?

I do think about security concerns like MAC Spoofing but I have a work around 
for that  

Any thoughts,  “Tony”?

Best Regards
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