Instruct: Classify Amazon reviews into positive or negative sentiment
Query: two things left off the details

These phones so far work very well. There are two points to heed if you are doing wiring for them.The phone takes in telco lines two at a time. One connecting cable/wire carries lines 1 and 2, and the second carries 3 and 4. DO NOT FEED a dedicated fax line nor a DSL line to line one (first cable, inner pair of wires in a 4-wire jack/plug). Leave that as plain as you can since it seems to be the administrative line for the system.If you're feeding a line with DSL into this puppy, it REQUIRES a DSL filter on the line. Feed DSL in on line 3 (the inner pair of the second cable) as a telco DSL filter will filter the inner pair of line 3 and pass through on line four (the outer pair). That will make this phone's setup easy.