The Avaya IP Office 406 V2 control unit is a stackable unit with an optional 19" rack mounting kit. The IP Office 406 includes:
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 dialled in on separate lines. IP extensions do not use data channels.
Optional internal upgrades allow for the support of up 12 x V.90 modem calls and a 4, 8, 16, 24 or 30-channel Voice Compression Module (VCM). The VCM module supports 4, 8, 16, 24 or 30 simultaneous Voice over IP sessions. 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.
Through support of up to six external Expansion Modules, the Avaya IP Office 406 can be enhanced to support a mixture of analogue, digital or IP phones to maximum of 190 phones.