Keeps an active call session alive.

Before you call

• Your organization needs a calling licence or add-on, and the API key's user needs permission to receive calls for the call.
• Pass the callId of a call that is ringing or in progress.

How it works

• Call it periodically while the call is open so its media session is not closed; the response body is empty.
• Only the user currently on the call can keep it alive.
• Returns 422 if the call is not found, already closed, or held by a different user.

Rate limit

• 15 requests per minute.