Airtel Xstream Fiber with Static IP Router Model: Dasan H660GM-A

[t.s]

Partially Yes, But 80, 443 and 22 are still closed

 

[Cronus]

Hey, Recenlty i got my new connection of Airtel Xstream broadband DASAN Networks(H660GM-A), I don't want to use landline telephone, wanted to use VoIP/SIP softphone, I tried several things i kenw but nothing worked out, Please help, setting up. These many details I have gathered SIP server, Proxy Server, domain from logs and router.
how to setup?