International calling minutes is increasing. But the growth of traffic over conventional carriers is slowing down while VoIP, especially Skype is picking up. Here is the volume of traffic handled by Skype in the past few years

2007 : 21.9 billion minutes
2008 : 33.1 billion minutes (51% growth)
2009 : 54 billion minutes (63% growth)

In 2009, the volume of traffic on Skype was 13% of total international traffic (409 billion minutes)

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