Voicent Flex PBX - Version 1.0 Voicent Flex PBX is an easy-to-use software-based PBX system for small and large business alike. It supports both analog phone services and VOIP services. Besides the basic PBX features like auto attendant, unlimited call queues, configurable extensions, call forwarding, etc, it is readily extensible through Voicent IVR Studio for more advanced features like database access and email processing.Voicent Flex PBX offers point-and-click configuration, easy installation, and lower cost of ownership.