Can I measure my internet speed?
Yes, you can. There are websites that allow you to perform rudimentary tests to see how fast your internet connection is and they provide a good guide to show you what you are dealing with. I’ve mentioned some interesting website tools below, but this seems to be the best that I’ve seen: http://www.speedtest.net/ They use technology from ookla.com and you might find the results quite interesting.
Here is an interesting calculator and by the looks of it, its probably focussed more towards nerdy type people: http://www.bandcalc.com/ Just make sure that IP is the selected parameter and it shows you that the average bandwidth is 80kbps.
There’s also this guide that shows you the different codecs and how they effect the bandwidth used: http://www.ozvoip.com/codecs.php