Welcome to the community.
I pulled up your account using your community details.
We do not have reference for your new TP Link modem/router but here are the settings that you may need to configure your VOIP.
a. Interface: ppoe_8_35_1
b. SIP Transport Protocol: UDP
c. VoIP Service Provider: TPG or Others
d. SIP Registrar Address: tpgvoip.tpg.com.au
e. SIP Outbound Proxy: tpgvoip.tpg.com.au
f. SIP Proxy Server Address: tpgvoip.tpg.com.au
g. PORT: 5060 (universal port for VoIP)
Let me know should you require further assistance.