They are smart for non BT wiring and a good price too. If you do choose to buy one/some, can you post some before and after line stats, see what kind of bleedthru there is onto a quiet phone (just press one digit to get rid of dial tone when adsl is active on the line) and also a mini review would be cool, all if you have the time obviously!
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Happily bonding ADSL lines with
Xifos at 23Mbps
Speedtest
Xifos Review -
Here
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