Adapting RJ-45 to RJ-11?
They plug right in
If you wire the blue pair (4,5) for phone service (or the blue and green (3,6) pairs for fancy two-line phones.)
No adapter is needed.
I do it at work all the time (my employer's employer's employer uses 24 port Cat5e patch panels as voice patch with a 25 pair cat3 run to them. One pair to each jack and one spare pair. I don't know why they do it that way, but they do. Anyway, an RJ11 or RJ12 plugs right in, no fuss, no muss, connects fine if the pairs are connected - which might be one reason you are not finding an adapter &quot;that stands out.&quot; Any such adapter is a scam, unless it's doing something like breaking out 4 single line or two double line RJ11's (RJ14, technically) from one RJ45.