Re: Every single time
And you can plug an RJ11 into an RJ45. I've used domestic telephone setups where all the sockets were RJ45 and all the plugs were RJ11. (Not in the UK.) It works fine. What doesn't work, of course, is plugging an RJ11 uttering telephony signals into an RJ45 wired for Ethernet. But the exec in question did not actually force a round peg into a square hole.