https://techcrunch.com/2017/09/27/this-35-add-on-will-let-amazon-echos-place-phone-calls/

The Amazon Echo Connect will connect Echo devices to landline phones. Yes, a landline because safety.

The thought is with this add-on Echo owners will be able to dial telephone numbers, like 911 or Pizza Hut or Mom, by just using their voice. To do this, the device connects to a home phone system through RJ-11 jacks. It uses the line’s existing phone service to handle the dialing.