Hello

I am in Australia and recently had an FTTP NBN connection changed over from ADSL2+. I ported my number across from my old provider and my new provider (Barefoot Telecom) says it's activated. I wanted to set it up today but I can't figure out how to do it. Firstly, when I used the splitter I lost the internet altogether, but there's no way to connect the phone line without using the splitter. 

Secondly, when I looked in the settings of the modem, there's no option for Telephony under Advanced, as instructions I found said there would be. I can't see anywhere else where I would put in the settings to allow for the use of VOIP. It says online it's capable of running VOIP, and my mum has the same router and I set up VOIP on hers, but don't recall having issues finding the Telephony page.

My ISP says they do not provide any service for setting up VOIP, I attempted contacting TP-Link but cannot send a message on one browser, and the other browser won't even open the technical support page at all. 

Any help would be greatly appreciated, as I am finding this rather frustrating.

Thank you in advance.