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Connect the WAN port of the Telstra Smart modem to a LAN port of the TP-Link modem, turn off WiFi on Telstra Smart modem and connect your phone to the phone port on the Telstra modem.
What is the model of the Tp-link modem?
Has the Telstra Smart modem Gen 2 modem been used at any time as main modem? The Telstra Smart modem must first be connected directly to NBN so that the VOIP configuration can be downloaded from the server to the modem.
If there are any SiP ALG settings in TP-link modem disable them.
If the LAN IP address of TP-link modem is 192.168.0.1 then change either the LAN IP address and DHCP address range of TP-link modem or Gen 2 modem. Example change to 192.168.178.1, 192.178.2-254
Previously worked with a Telstra Partner however I am not a Telstra Employee, just a fellow customer helping when I can.