s 1itu workshop on ip telephony geneva june 2000 helmut schink icn siemens de 49 89 722 44523 ag m cs 21 81359 münchen hofmannstr 51 2itu content 1 drivers 2 principles 3 application 4 challenges 5 standards 6 current product 7 closing 3itu driver for tomorrow communication bitrate growth in data networks is higher the internet becomes a second universal network besides voice source cm itu isoc total average year 1985 gbit 1990 1995 2005 2010 2015 2020 telephone 106 103 10 4itu stays main revenue generator service lucrative and providers 0 1998 2003 over market share voip global call minutes as percentage of votdm impact telco services revenues ovum ltd 29 20 25 50 100 150 200 250 300 350 400 1993 &
