ClassViewController+Call.swift

import VoxeetSDK
import VoxeetUXKit

extension ClassViewController {
    func startCall() {
        let options = VTConferenceOptions()
        options.alias = "history_class_id"
        VoxeetSDK.shared.conference.create(options: options, success: { conf in
            VoxeetSDK.shared.conference.join(conference: conf)
        }, fail: { error in
            print(error)
        })
    }
}