Per Dictionary.com
phone comes from the Greek language and means voice.
So I get what your husband is saying but I still disagree with him.
Language is a living evolving thing. Millions of people have decided that video phone means uh, well, what it means.
We've always cobbled together new words from words we already have. 100 years or so ago we use to use Greek and Latin to cobble together new words because people still studied those languages in the public schools. So the inventors came up with words like television and telephone. Television and telephone borrowed the Greek words tele (far) and phone (voice).
If Sean Berdy was giving a public performance at Madison Square Garden* to mostly hearing people and someone announced that there would be a slight delay because Berdy had an emergency video phone call, I think everyone would understand the announcement. No one would have to reach for dictionaries or ask their friends what the announcement meant.
Compare that to someone announcing that there would be a slight delay because he had an emergency teleikon call? No one would know what the announcer was talking about even though i
n 1930 the first videophone was invented and called the ikonophon. (Ikon was borrowed from the Greek language and means "image", so ikonophon means image+voice. )
And people like your husband might still have a problem with using the word "call" in that context -- but really what other word should we use?
And now, years later, people don't think of the word phone meaning "voice" but of a personal device that you use to communicate one on one (unless you're using the conference call or speaker phone feature).
Anyone that has a problem with that will need to bring back Greek and Latin back into the public school curriculum again.
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* I know that's a far-fetched example -- but it does make the point.
