Hi bro, currently I'm using BSNL isp in that voip config is not Registering. While disscus with bsnl technical team, they said it might be a firmware issue. So pls share me a latest firmware to...

I had recently purchased Tp-link xc220-G3v model router that I'm currently using Bsnl isp which i asked Bsnl technical team to config voip but unfortunately its not worked and bsnl technical team...