For your case, it's better to send email consultation to tp-link support with the port forwarding settings.

as far as i know, the router get the ip address from the ISP. so if that ip address isn't the same as whati's my ip website showing, which means there is NAT in the ISP side. you need to go to isp to...

i can't find codec in the menu, either. but you can try disable SIP-ALG under forwarding--ALG settings also enable voip qos under QOS--put voip on the high priority list.

i can't find codec in the menu, either. but you can try disable SIP-ALG under forwarding--ALG settings also enable voip qos under QOS--put voip on the high priority list.

you need to make sure that D7-2b is getting internet from ISP router. troubleshoot like this. first test the cable from isp router. put that cable to a laptop to test internet. if no, then it is...

do you have a Vr900 v1 as well? and the connection is not stable? have you tried contacted ISP about this issue? virtue67 wrote I had similitude issue mine was deemed faulty got swapped