I am looking for websites/URLs where I can find market
statistics/information on telecommunications / networking.  I am
looking for statistics on information like:
*  Voice vs. data telecom traffic
*  Analog vs. Digital traffic
*  Circuit switched vs. non-switched traffic
*  Wireline vs. wireless traffic and what percent of each is Voice vs. Data
*  % of Wifi/SIP enabled cell phones as a percent of all cell phones sold.
*  % of data/voice transmitted over the airways vs. IP (and for those
over IP what is percent transmitted over wireline vs. wireless)

I am trying to understand how the type of information being sent over
networks is shifting over time.  You don't need to answer the specific
questions above, I just need URLs.  I am looking for global data, but
if that is too difficult, U.S. based data will suffice.