Plans to deploy VoIP are soaring, but enterprises still have a hard time justifying costs to upper management. According to a survey by BT INS, 62% of respondents either have deployed or are in the process of deploying VoIP across their networks—up from 44% in 2005. Another 18% are designing or testing VoIP deployments for limited network segments. At the same time, however, cost is becoming a more significant barrier to adopting VoIP, the survey found.

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