Finding a voice modem has become a struggle.
Finding voice drivers for windows 10 a hassle.
Here's a page of reference conexant drivers you can force windows 10 to use. You'll have to use the Browse my computer, then Let me Pick, then Have Disk, or it will claim the voiceless microsoft driver is newer and therefore better.
Century Control Systems, Inc. www.centurycontrolsystems-inc.com