If you encounter Teams error "We couldn't connect the call, The call could not be placed, try sending them a message first", see this post.

Audio and video calls to others who are using MS Teams are available using the MS Teams Call app. Webex does not have Instant Messaging (IM) or chat room services. If you have a Jabber chat room you ...

Microsoft will soon add new fraud protection features to Teams calls, warning users about external callers who attempt to impersonate trusted organizations in social engineering attacks. Named "Brand ...

Microsoft plans to introduce a call reporting feature in Teams by mid-March, allowing users to flag suspicious or unwanted calls as potential scams or phishing attempts. The new "Report a Call" ...