hi, i am using TPlink AX50 and following the below set up with Vlan VOIP at Lan4 of TPlink router.

TM ONT -> AX50 WAN port (internet is working)
AX50 configured Voip VLAN at LAN4
AX50 LAN4 connect to Aminia AC1200 WAN port via LAN cable
RJ11 is connected to Aminia tel port.

But i keep getting engaging tone with such configuration.

Help pls.... thanks.