using KAON AR2140, want to change to own router to main but need to use Voip and wifi function AR2140.

After set AR2140 to bridge mode, only wifi working but Voip not function.

connection as below

TM modem (lan2) - AR2140 (wan port)
AR2140 (lan) - New router (eth0)


Any sifu can help, also after AR2140 bride mode i cannot login in back using ip 192.168.1.254 into the router