Comdial 7270C Corporate Office DX Hard Drive Voice Mail (Refurbished)Combining the DX 80 platform with Comdial's industry recognized Corporate Office Voice Messaging software makes for a complete small business telephone solution. With a digital voice processing card installed directly inside the telephone system, the DX 80 provides fully integrated voice messaging without requiring the dedication of any telephone system extension ports. That means all 56 extension ports are available for digital and analog expansion.