Can I make an immediate call without scheduling a meeting?

You can have an instant meeting without a booking a meeting.
 
This can be done by:

1. Go to My Profile

2. Click on Meeting Rooms

3. Type in a room name (ie quick meeting, introduction..etc, be aware that no spaces, uppercase, or special characters are allowed.)

4. Click on Add a room

5. Share the link with your client
6. Join the call