Internet phone systems route calls to a particular computer on the Internet, not to a specific physical location.

FORBES: Cost Of Net Phone Calls May Rise

Internet phone systems route calls to a particular address on the internet, not to a specific physical location, so it can be tough to provide emergency services with information about where a caller is located.

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Last year, Citadel, Merrill Lynch, UBS, Credit Suisse Group, Citigroup and Morgan Stanley collectively bought up more than 80% of the Philadelphia Stock Exchange and are plowing resources into its electronic trading systems with a goal to route more stock order flow through it.

FORBES: Magazine Article