Don`t know how to give voice Priority

If somebody can subscribe me step by step how to do queues , trafic mark and all this stuff it will be such a great help .

i have a network with a real Ip Add-dres a Mikrotiki Router Conected to a Cisco router but don`t know how to give Voice Priority (because i have an IVR on my network) .

So i need to know how to mark SIP and give it Priority on mikrotiki .