VoIP and QoS is already a challenge. I have been struggling with this for months now.
Perhaps you know answers to my questions about Option 2 QoS from this topic?
http://forum.mikrotik.com/t/using-routeros-to-qos-your-network-2020-edition/66683/88
http://forum.mikrotik.com/t/using-routeros-to-qos-your-network-2020-edition/66683/89