Below are some strategies for supporting the children in engaging with the humans on the other end of the screen.
One idea is to keep moving. As your chatting partner (whether that is a grandparent, a family friend, or a teacher) to move around their house as they talk to your child. This can lead to games such as 'I Spy', finding objects to tell your child about, or giving a tour of their home.
When in doubt, sing it out! Music keeps children engaged in a video call. Many songs are accompanied by hand gestures or support jumping, dancing, and moving for an added interactive component. If your chatting partner can play an instrument, that is a bonus!