That setup was long gone. Anyway, with standard SIP devices, I like to use straight UDP and not try TLS or SRTP. Then I usually set the Username, password, and name of the phone all to be the extension. That eliminates any translations issues. If it comes up, then you can start using different password or username. You might need the User/password in Digest Authentication. Set the registration timeout at 3600 or more. After that, point the point to
http://IPofEdge:5060. Check that you assigned default sip phones to the edge LAN interface you are using as well.
If you don't get it registered, best to look at the PCAP on the Edge and see if you are actually seeing the registration invite and it is the correct protocol.