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Grandstram UCM6302A is an IP PBX with a telephony operating system based on Asterisk version 16, supports up to 500 users, and 75 concurrent calls. Grandstream UCM6302A also offers up to 5 layers of IVR (Interactive Voice Response) in multiple languages. It offers call center functionalities like multiple configurable call queues, automatic call distribution (ACD) based on agent skills/availability/workload, in-queue announcement.