Please check “Teams/Skype Consumer chat and calling interop” on the public roadmap at microsoft.com/microsoft-365/roadmap?filters.. for updates.Steen Kirkby commented
It looks like the integration with consumer Skype is coming very soon.
From the Office 365 roadmap under "in development" features:
Microsoft Teams - Calling Support between Teams and Skype Consumer
This is one of the SfB calling capabilities coming to Teams. Support for 1:1 Skype Consumer Calls. This feature is targeted for availability by Q2 CY 2018.
Estimated Release: June CY2018
Feature ID: 24209
Added to Roadmap: 10/24/2017
Last modified : 05/01/2018