Network monitor is in KB or Kb?

On the FreePBX Server Status page it shows eth0 transmit and receive stats. It shows them all as KB/s which would be Kilobytes a second. Each call makes it go anywhere from 50-57KB/s however that’s 400 to 456 Kilobytes a second which doesn’t make any sense. There’s no way that each call uses half a meg of bandwidth. Is this just a typo and should be Kb/s? Even so I thought calls were 64Kb/s but mine run 45-57 on average all the time…