So for remote extensions that are connected through VPN to the main site the only thing that is need to define the network as local in Asterisk SIP settings ?
In the following setup nat shoulb be set to yes or not for phone2 ?
nat should be left unset in this case. nat should never be set to yes, but rather to the individual settings actually needed.
Setting it to yes may be relatively harmless, as it doesn’t actually change the addresses used. It’s equivalent to setting force_rport and comedia, I believe.