Esteemed Brethren o' this hallowed trade!
Methinks too much gets said betwixt us upon VOIP, alas without detail regarding which ports our most honourable ISPs truly must deem proper leaving for us at liberty to use.
If I, as it were, had a Lingo contraptioun, which ones, named by their very own numbers, would the aforesaid ports have to be?
And, of those, which ought to be open to inflowing parcels, and which to outbound?
Grateful, in confident expectation of your beaming wisdom, I remain.
(P.S.: If I use Lingo for VOIP, what f****ng incoming and outgoing ports should be left open by my ISP?)