[masraum]

Or a related note, years ago (probably 12) we had an audio engineer (PhD) visit from a vendor to talk about a product that went hand in hand with VoIP phones. He was saying that "they" had a tough time because the old style handsets (like you have pictured) were good for audio, noise, quality, etc..., but that the way cell phones were (are) built, flat and shorter than the distance between the ear and mouth made it very difficult for audio engineers to enable good audio. I'm assuming the growing size of cell phones since then has helped since the speaker and mic are now closer to the ear and mouth vs when cell phones were smaller.
So potentially, that handset above should actually enable (assuming it's quality components) better audio performance for calls.