The main hub of an IP Office Server Edition network is the mandatory primary server. That is a Linux-based IP Office server supporting both IP telephony and a range of supporting application services for the telephony users.

The network is then expanded using the optional secondary server and expansion servers. These provide additional features and direct support for IP telephony services is different physical locations.

In addition, in some scenarios an IP Office Application server can be used to support the primary and/or secondary server. For details of the server roles, see Server Types and Roles. For details of capacity support, see Avaya IP Office™ Platform Guidelines: Capacity.