Frnd call the number on router box or email tp link support they will provide you with firmware thats the only official way

@Confeder8 if you reflash the firmware with the one that is provided by tp link do all the settings config step by step without repeating any step then only voice works. Firmware will be provided by...

@mikeharing72 u need to call tplink provide them your details and they will email you... that firmware will have name as datecode latest date

@mahat frnds without downgrading the firmware this router is not usable for any isp where you want to use both voip and internet hence dont buy this and if u have done then u can contact me regarding...

@mahat To all the people who are thinking of purchasing this model router. If you are willing to use voip/ telephone service regardless of which isp bsnl or airtel or any local who gives ftth...