Save a packet with internet telephony

摘要

The leafy ivy league campus at dartmouth college in new Hampshire may not have the look and feel of a technology testbed. But looks can be deceptive. Almost 20 years ago, Dartmouth was one of the first places to wholeheartedly embrace electronic mail, rolling out a simple system called BlitzMail across a primitive university-wide network. Then in 2001, Dartmouth unveiled a campus-wide wireless network that allowed students and staff to surf the net and to access email without the hassle of wires and plugs. Once again, Dartmouth was ahead of the game: similar Wi-Fi hotspots have now sprung up in coffee shops, restaurants and airports allover the world.