This guide addresses Basic servers, SOHO servers, and Enterprise servers.
SOHO servers typically have a small number of serial modems, used for Remote Access (in or out), shared ISP access, FAX (in or out) and interactive voice response (IVR). The modems used are traditional serial modems, similar to those used for Workstation PCs, as defined in PC 98 System Design Guide or later. These modems are typically connected by individual PSTN phone lines or by ISDN BRI lines.
In an enterprise, the modem servers may support hundreds of modems, used primarily for inbound remote data access such as for an ISP or corporate network. The modems are typically connected to public networks on high speed digital lines (T1, ISDN, or PRI). Different servers may be used for dedicated incoming Fax reception or IVR. Note that Windows NT 5.0 Unimodem and TAPI can be used to support hundreds of modems for each server.