Microsoft Teams (formerly Skype for Business) is an online service provided on a monthly basis:
60 Skype minutes available to call colleagues, business partners, friends or family on a mobile or landline, whether they have a Skype account or not. You will be able to use them from any device on which you have the Skype application installed (mobile, tablet, TV or any other device).
The ability to schedule unlimited virtual meetings or start them at any time, with up to 250 participants who can join from any smartphone, tablet, PC, etc. These meetings include audio, HD video and desktop and/or application sharing.