Is it possible they'll overtake the US' lead anytime soon?

While consumer VoIP in Europe is has good growth potential and history, enterprise VoIP hasn't done so well. In fact, though GB is just barely behind the US in business VoIP adoption, the 2nd European country in line, Italy, is FAR behind.

Hall said, "The UK is a leader when it comes to enterprise VoIP, although many companies now aren't just adopting the technology to cut call costs."

VoIP can be used by companies to get free or cheaper calls by using IP networks to bypass the public switched telephone network (PSTN), but Hall said other factors were now coming into play.

Hall said strategic investment, employee mobility, and increased productivity now eclipsed reducing call charges as a reason for adopting VoIP.

VoIP is now a driver for companies buying in managed IP VPNs (virtual private networks) from third parties, as part of their strategy to replace traditional private branch exchanges (PBXs)