SNOM 710 Remote IP Setup

Has anyone had success setting up a SNOM phone with Remote connection to a SIP Asterisk PBX?

I have not found any information to set this up with success. I followed this guide and still no go.

Any suggestions or links would be appreciated, Thanks!

… more of a other approach suggestion… not a fix your your specific issue…

My remote SNOM phones connect to my remote Asterisk PBX via a secure VPN tunnel. I’ve never had a lot of success with SIP and NAT… but my VPN Tunnel
sends everything so that is not an issue. Basically… I have a ‘remote’ network connected to my ‘local’ network using a pair of linux boxes that runs the tunnel. My SNOM phones don’t know that they are remote.