So i found solution to this of one way voice. The problem isnt NAT ALG setting not even NAT itself under VLAN interface for VoIP. The problem is that Host Name is empty. As soon i entered host name in my case "Archer_VR2100v" voice was perfect and crystal clear even better then ISP modem routers. So you should fill you Host Name under VoIP VLAN interface and that should do it. You can even change region even(if you want your dial tone) if its locked in GUI. The thing is you must go back to QuickSetup and guess what country is supported for VoIP Locale in my case its Serbia that i need. Here is list of all VoIP locale that you can change to via Quick Setup. https://i.imgur.com/tWRBoHC.png