Vertical Communications, Inc. is a corporation that specializes in premises-based private branch exchanges, i.e., business telephone systems. Vertical Communications changed its name on January 1, 2005 from Artisoft, Inc. after acquiring Vertical Networks in September 2004. In September 2005, Vertical Communications acquired Comdial. On December 1, 2006, Vodavi Technology was acquired by Vertical Communications. Vertical offers new telecommunications products, as well as products from legacy product lines including: Vertical sells almost exclusively through a value-added reseller (VAR) channel. Partners must meet certain minimum requirements to become a VAR, including purchasing a demo system and qualifying technical personnel by having them attend online training.