ModemServe is only designed for Dialout usage. It is possible to configure some modem based applications such as pcAnywhere to allow Dialin access on a modem (If ModemServe Server is not configured to block client Dialin). However when a particular client application holds a COM port open on the Server as it waits for an incoming call, it prevents other clients from being able to access that COM port (until the COM port is closed).

By installing Microsoft Remote Access Server (RAS) on the ModemServe Server computer, you can allow the same modem pool to be used for both Dialout (handled by ModemServe), and Dialin access to your network (handled by RAS) without any conflicts.

For more information on Microsoft RAS, visit our:
Microsoft Remote Access Server Support Page