End-Point-Manager over Internet

Hi everybody,
I'm running FreePBX on a vServer because i want to use Phones from different locations with my PBX.
I have Cisco 7940, 7940G and 7960 Phones for all Users.
Is it possible to use the endpoint-manager over Internet as well? I tried it with configurating the TFTP on the Phones manually and creating a configuration in the endpoint-manager, but it doesn't work, the phone doesn't get a config.
Can somebody help me?
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tftp does not require a
tftp does not require a password and exposes information over the Internet that presents a security risk.
You also have to open tftp for this to work.
I do not recommend using these phones without a VPN.