Calls remove some of the context available in face-to-face conversation. On the phone, listeners cannot see your expression or know when you are reading a document. On video, delay and unstable audio can interrupt normal turn-taking. Clear verbal signposts replace the missing cues.
A practical call has a visible structure even though it is spoken: identify the people, check whether the time still works, state the purpose, handle the discussion in short sections, confirm key details, and close with actions. Names, numbers, links, and deadlines deserve slower pronunciation and explicit confirmation.