3Com OfficeConnect 3C886A Release Note page 21

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Figure 11 Virtual Fax Modem Parameters Page
3 Enabled: Check this box to enable or disable the Virtual Fax Modem. By default
the Virtual Fax Modem is disabled.
4 Time Limit: This field is used to set the maximum time available for a Virtual Fax
Modem connection. Once this time limit is reached, the connection will be
automatically dropped. Note that when the Virtual Fax Modem connection is in
use, no other calls can be placed or received on that telephone line. To disable this
feature leave this field set to its default value of 0. In this case Virtual Fax Modem
calls will be dropped when the application using the connection is terminated, or
by manually disconnecting the call via the LAN Modem's Manual Call Control
page.
5 Click Submit.
This completes the LAN Modem configuration options for the Virtual Fax Modem.
The connection established by the Virtual Fax Modem cannot be shared. When in
use, no other calls can be placed or received on that telephone line until the
Virtual Fax Modem call has been disconnected.
Virtual Fax Modem (Windows 95/98 and NT 4.0) 21