I have the kenable ones. (0.5m, various lengths avail)
I have bought the tandy ones in the past, I was not aware there was a difference.
I’m assuming that there's no point in having a SSFP filtering faceplate since there's no LF to filter as no PSTN and no filter means no possibility of inline attenuation caused by it.
@dray - re: "cca" - not ideal of course, but mine are only 0.5m long, so the resistance is hopefully low anyway (esp compared to my 4+ miles of copper). out of interest, how did you discover the composition of the two cable types?