Under "Network" -> "WAN" does your IP address look like "192.168....."

So your connection is ethernet cable from your ISP, which goes directly into your router ?

Try to change the port, for example 8080 and see if that helps.

TBH, there shouldn't be any relation between what ADSL modem (new one or the old one) is connected and the phone operation. Only the internet should be affected when you swapping the ADSL routers. Do...

@Aeron I believe that your query will be better answered in the DECO section of the forum. As browsing through tech specifications of Deco M4, buying an Archer C7 would appear redundant. Looking that...

@Arson_NY12 Check up the manual or this guide to set up A6 as an access point (AP) - this involves Ethernet cable between your routers. The other way is to use WDS over the 2.4GHz band which is over...