How should sip NAT setting be , when a pbx has more trunks in NAT and no NAT connections ?
i.e. three trunks , one with a same LAN pbx, one with a pbx over vpn, and one with ISP being behind a natted router, and maybe , some ip phones registering from internet to this pbx behind nat (just examples)
What about sip settings > general sip settings > nat settings > external address field when a dynamic ip from ISP is used ?? Does that field update automatically when a different ip is obtained ?
Same nat section: should I declare as local networks also subnets reachable via VPN ?