I am using ftth connection.Previously used act fibernet.When using act webpage would load very fast and whatsapp calls are also clear.But when i started using bsnl web page connects slowly and whatsapp calls also lags and distorts.Using modem provided by bsnl(Huawei echolife hg850a) with TP-Link wr840n router in dynamic mode.Changed dns server to google dns in router wan page.but still problem persists.please solve issue.