this post was submitted on 24 Oct 2023
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You are going to have issues when it comes to power over ethernet, which pretty much all modern IP phones kind of expect to have as a default these days. Yeah you can use power adaptors, but that's an even messier solution.
Besides most modern IP phones that are designed to be wall mounted account for the RJ45 jack in some way as they know it can't and never will fit flush. What phone models are you using?
Yealink T31's
The wall mount will just about accommodate a cat 6 patch cable without a boot and with an extreme bend.
In a couple of places where we used the supplied cat5e cable that came with the phones we had to cut the moulded boot off the cable.
I'm also looking at some different mounts for some areas that have a flat back plate rather then the hooks to hang on screws as we aren't allowed to drill into the walls.
With regards to POE I know we have at least one phone working with POW using a set of splitters to get a phone on our LAN with a POS system on the POS providers broadband, so wasn't sure if using a short ~6" length of reterminated phone cable to go from the socket to the phone would be workable. Thought Id ask the hive mind before getting the crimping tool out
Your absolutely best off using some of the flat/thin ethernet cord types that have been posted by others in this thread if space really does become an issue. You don't want to be repurposing cabling that is not intended for PoE, especially if your a business. I note your in the UK as well, so you will fail PAT testing too using non certified cable for PoE.
Having done pat testing (albeit a long time ago) wouldn't POE be outside of the regs as its considered low voltage?
Experience tells me that most PAT testers who don't have an IT background will Just sticker stuff and move on. From the contractors that used to PAT test out building I have seen a power cable that had been shut in a floor hatch under a desk with copper showing pass, presumably as the bit they could see was ok.
A printer or a work bench being repaired fail because the the rear cover was off and the fuser unit removed. A tester come out form under a desk start walking away then spot the laptop sitting on the desk, drop a sticker on its lid without even looking at it and then walk away. They were form a large, possibly national company that just did PAT & electrical testing & I'm not sorry to say they don't have the contract any more
You are probably right, most testers can't be arsed and will stick a sticker on a toaster sitting in a full bathtub if it means they get home quicker.
POE is a weird one when it comes to PAT testing. Because the phones can be powered by a plug in power adaptor they qualify for PAT testing and the devices that supply the power for the POE qualify for PAT testing so it often comes down to how your PAT tester wants to interpret it. Some take the whole chain from power socket to ethernet cabling while others just consider the devices themselves. If you get the former though, they will fail 2 pair (If it can even carry PoE).