I'm using Asus RT-AC68U, mostly all the Asus RT series router support Maxis fibre. I didn't change the Alcatel Lucent modem from TM, just hopefully one day Maxis will move the voip to the TM modem and can totally replace the maxis router. Now a day if I want to use the voip, I have to connect the maxis router to port no.3 on Asus router. I have few sip phones around and try to to register to maxis sip server but failed, however if i use any of the free sip softphone I'm able to register it on my phone or laptop.