What should the User ID be for Video-Call?

Should the User ID be the id of the person in my Users Table (for example the first user in my app will have an id of 1, the second id of 2, etc.)? Or can I make it the user’s name in the Users Table for example “Ryan Sacks”? Or should I create a random ‘sendbird_token’ column in my Users Table, when a User first Registers and use that token? What’s the easiest and most common way that other developers usually do this?