Make a Phone Call with Alexa
You can make a phone call with Alexa if you have the right home phone service. With Ooma, you can make calls using the Ooma Telo or with the free Ooma service that includes 300 minutes a month.
In the Alexa app, search for Ooma, add the skill and then link your Ooma account. Once you set this up and link it you can say, "Alexa use Ooma to call Adam." Or use a specific number.
This will not turn your Echo into a speakerphone, though. Instead, your cell phone or home phone will ring and then the call will dial in the recipient.