Register Cisco IP phone over the net, CME 8.6

I'm trying to register a phone to CME over the net and yes TFTP is open on the firewall to the CME router. CME version is 8.6 and the phone model is 7941.

I know we can do phone proxy or site to site VPN to the remote office but this just for testing. Is this possible? if yes, what other ports should I open up on the ASA Firewall.
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sip, rtp, rstp, video ports that you are using
EKITAAuthor Commented:
Do you have documentation to assist. the firewall is an Cisco ASA 5505

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