[singpolyma3]

Are you doing calls to/from other sip URIs that are also behind NAT, or just using your trunk and internal extensions?

[deno]

Trunk and internal, and I usually put all the phones in their own VLAN w/o direct Internet access. I don’t really see a use for dialing arbitrary SIP URIs. If I need to add a remote phone I’ll just connect it directly with a network tunnel.