Default [Q] Internet calling CSipSimple/stock app

Hi, i have recently created account at ostel.co, iptel.org and getonsip.com and on all three i have same latency with csipsimple, ~1second what makes it unusabe. i readed at csipsimple bugtracker that there are some tweaks in settings but no one help. so i think that the problem is in phone's audio routing, maybe with kernel.. if i use stock android internet calling, latency is much better, but it don't have encryption. on PC latency is near perfect. have somebody same problem? or solution?