The Voice track concentrates on voice solutions for the enterprise and includes subjects such as Quality of Service, MGCP, Call Manager (Cisco’s VoIP PBX), Cisco Unity (Cisco’s Unified Messaging platform), Unity Express and IP Contact Center Express.Most candidates pass the CCIE Voice certification after three or four lab attempts, but there have been cases in which candidates pass after more than six attempts. The low passing rate is attributed to the difficulty of the exam questions as well as
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