) : CallEvent() {
    override fun closes(event: CallEvent): Boolean = event is ConnectionAcquired && call == event.call && connection == event.connection
  }

  data class CallStart(
    override val timestampNs: Long,
    override val call: Call,
  ) : CallEvent()

  data class CallEnd(
    override val timestampNs: Long,
    override val call: Call,
  ) : CallEvent() {