Hello, i´m trying to install Proxy Manger in a remote office with SPA921. And the extension doesn´t register. I attach captures of the configuration. I did put in outbound proxy the liseting ip of the proxy tunnel, but don´t register. I did all combitanions as posible, with public and privite IP´s. Only register with the public IP without the proxy manager. I put all the parameters that are in the wiki --> 3CX Sip Proxy Manager, but don´t work. Any idea ?