With a more powerful call processing engine and greater internal data transfer capability the IP412 is the most suitable of the IP Office range for meeting the needs of the small contact center or businesses with a CRM focus. The IP412 differs from the IP406 Office by providing a greater trunk expansion capability of up to four PRI trunks. The IP412 is a stackable unit with an optional 19" rack mounting kit. The Avaya IP Office 412 base unit includes: • Two 10/100 switched Ethernet ports (Layer 3). • DTE Port. • X.21/V35 WAN interface. • Support for 12 Expansion Modules (360 extensions maximum). • External output port containing two switches for door entry systems. • Audio port for external music on hold source. • 100 Data channels (Maximum 30 useable for Voicemail Pro). Note: A data channel is used whenever a call is made from the IP network to an exchange line (Central Office). For example, four people surfing the Internet will use a single data channel since they all share the same line to the ISP. Two people remotely accessing the Office LAN from home will use two data channels since they have dialed in on separate lines. IP extensions do not use data channels. Optional internal upgrades allow for the support of up to 12 x V.90 modem calls and two 4, 8, 16, 24 or 30 channel Voice Compression Modules (VCM). Fitted with two 30 channel voice compression modules, 60 simultaneous voice over IP sessions can be supported. These can be used for either providing networking between sites over a wide area network or supporting IP Telephones and Soft phones. Typically an IP extension only uses a compression module channel when starting a call and while on a call to a non-IP extension/line. It is possible to configure more IP extensions than the capacity of the installed VCM. The IP412 can be expanded by 12 Expansion Modules, however this is restricted to a maximum capacity of 360 analog, digital or IP phones. Requires Power Lead Part #700213390 Sold Separetly.