CrystalVoice Communications, provider of enterprise voice communications software solutions, announced it has incorporated Session Initiation Protocol (SIP) support into its family of business-class Voice over Internet (VoI) solutions. The addition of SIP expands the number of platform providers able to take advantage of CrystalVoice’s solutions to deliver high-quality voice over the Internet, including IP phone systems, conference bridges, ACDs, and voice gateways.