Question

What are the uses of callback events?

Applies To

• Vonage Video API 
• Session monitoring
• Use Cases

Answer

The callbacks can be used to drive business logic on the customer’s application server. In particular, it can be used to track the end-users that enter and exit a session. The event timestamps are present in the body of the message. There are 3 primary use cases:

1. Session moderating: checking who is in a session, removing users, knowing if someone didn’t join.
2. Tracking end-user usage: we have seen some customers use this for end-user billing - generating billing based on how long a user was in sessions or implementing pay-as-you-go services. 
3. Analytics

Additional Information

we do not recommend using the callback events for tracking end-users usage since we cannot guarantee the delivery of the events.