When I started my current job 6 years ago I was given a desk phone with a 100mb port. Speed didn't matter at the time as everyone was given laptops for our desks. I changed positions in the company where I'm going to be provisioning servers and whatnot over the network. Started using a desktop that didn't have a Wi-Fi adapter. I requested a new phone with a Gig switch port, if possible, so doing file transfers on the network wouldn't be limited. IT had a couple of questions...

IT-Have you noticed slowness when downloading/uploading?
Me-No, but its a 100mb port...so.
IT-Well I just did a speed test and we're getting 60up/5down. Your phone is over that.
(Working from home? Our fiber was way faster than that I thought.)
Me-That's fine, but this will be for internal network transfers. Not going out to the internet. We have gigabit switches on campus correct?
It-Yes but you shouldn't notice a speed difference.
Me, now lost-If you can't change out the phone that's fine. I'll figure our something.
IT-Now now, lets troubleshoot your issue. Can you plug your phone in?
Me-Yes I have it, but I'm remote today. There is no way for it to reach the call manager.
IT-Let's give it a try.

40 min of provisioning later he gave up and said maybe it is broke. Got a "working" one the next week.

PS first post, and writing on phone. Yay insomnia!