Metric: 435M SIP phone users by 2012

According to a recent report from Informa Telecoms & Media, there will be 435 million users of SIP-enabled phones by 2012. Sales of handsets with active SIP functionality will reach 275 million units this year, but the inflection point for sales will land sometime in either 2010 or 2011, the report predicts. The figures take into account both IETF SIP and IMS SIP. Informa's Malik Saadi said that "growth will be mainly driven by the strong will of device vendors to get involved in the content space but also by the increasing number of new entrants among VoIP and Internet content providers who are determined to challenge the mobile operator walled-garden service offering."

For more on the SIP report:
- read this article from TMC

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