Yes Thorsdad, that is exactly how mine is set up & working fine:

Internet=>Modem=>Router=>HT-502

My only concern was that a voipo tech cautioned against such a configuration because it is not the prescribed "right" way per their instructions. I am happy now, but being a network challenged person, just because something is working OK now for 1 day doesn't mean. . .! Since my initial post, I was able to talk live to another tech & he pretty much agreed that until I encounter any dropped calls or hangups, just be happy. So I'll be happy . Thanks.