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A few months ago, we ran a cat5e ethernet cable across the room, from where the modem-router is on one side to all the electronics on the other. Now I'm wondering if I can use a pair of RJ11-RJ45 adapters to run the phone line across that same cable run and have the modem with all the rest of the electronics.

Has anyone else tried something like this? Any idea how well it would work?

Question answered. Sounds like it should be fine. Thanks!

Update on the plan to move the modem. It's now in its new home and that cat5e cable is now happily carrying the DSL line (which it's ridiculously overspecced for). All working perfectly.

Bonuses for this relocation: I've been able to free up two network cables and an entire gigabit switch.

@Querral Are you talking about using the cable for the phone line instead of the internet connection, or in addition to it?

The former will definitely work without problems, the latter will also probably work without problems but with caveats (mostly, make sure the phone line uses an unused pair in the cat5e. if it's gigabit ethernet, there are no unused pairs, though.)
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@Hearth I mean to use the cat5e cable as a physical extension of the phone line, presumably leaving two pairs unconnected. It would no longer be carrying ethernet.

Because we've got VDSL, the modem sits between the phone line and the internal network, providing the Internet connection. I'm simply proposing to change which end of the physical cable the modem is on.

@Querral In that case, yes, that should work without issue. Plus you'll have two free pairs to do whatever you want with! Not that it's all that likely you'll have anything to use them for.
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@Hearth I don't mind having some dead copper in the walls. Having it is less trouble than replacing the cable run. That thing was annoying to install.

@Querral Of course. The difficulty of replacing in-wall and especially underground cables is why a lot of construction these days installs extra cables that don't get used, for future expansion.
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