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Go into the router and find the devices MAC address, it'll be in the format XX:XX:XX:XX:XX:XX Then go to https://www.wireshark.org/tools/oui-lookup.html and put them in there. That will tell you the device vendor (you only need the first half really) Also, after reboting everything, turn off...

Have you got dial tone on the landline ? If the line has a disconnection on one leg, BB will still work at a much reduced speed but you'll not get dial tone as there isn't a DC path.