Vonage was founded in 2001; Riverbed rolled out its first product in 2004.
Vonage成立于2001年；而Riverbed公司则是2004年才推出了自己的第一个产品。
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Vonage, an internet based phone company, last week predicted it could raise $493m, nearly double what it predicted in February when it filed to go public.
Mr Wegleitner at Verizon thinks the threat from firms like Skype and Vonage is overstated, because they cannot offer the same range of services as a network operator.