@Alexandre. Thanks Alexandre, thought that might be the case. Presumably I would disable the Telstra modem's wifi and utilise the VOIP function only. Hopefully there won't be any decline in bandwidth...

I have HFC NBN with NBN connection box and (currently) Telstra Smart Modem Gen 2. If I connect a TP-Link Deco x20 mesh system to the NBN connection box, can I also connect the Telstra modem to the...