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
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