Good Afternoon

Maybe a bit of an odd question but as I’ve alluded to in other posts I’m in the process of swapping out phones form our legacy PBX to voip handsets on a hosted could solution.

We have some phones that are wall mounted and I’ve found with some that getting a standard cat 5/6 cable into the back of the phone and getting it flush on the wall is not easy.

Would cutting an old phone cable and putting RJ45’s on it in a 10/100 pin out work?
Probably 30cm/12" or less just to get form a socket in the wall out to the handset?

Thanks

Grant