@Hawk86eye Sorry that the port forwarding settings on the C80 are slightly different from that on the C7 V2, it doesn't allow to set a port range. While as you mentioned already, the workaround is...

@W.e.S Hi, as you found out, there is no such PPP Echo setting on the C5400X. BTW, may I know where did you set this PPP Echo on the W9970? Can I have the screenshot? You may cover some credentials...

@MOXIE Hello, Below is a setup video for your reference to install your wireless router: https://www.tp-link.com/support/setup-video/ But if you still failed, please refer to the troubleshooting...

@AmnsNgh Hello, Below is a setup video for your reference to install your wireless router: https://www.tp-link.com/support/setup-video/ But if you still failed, please refer to the troubleshooting...

@kaijin Hello, if you want to use the VOIP and the Archer C5v must be the master router, it is suggested to configure the AX20 as an Access Point to avoid double NAT issue.

@jimmylam0710 Hello, thanks for reporting this issue to the community. It is suggested to clone the PC's MAC address, who can access the internet stably when connected to the ISP modem directly....