6-12 Netopia ISDN Modem User’s Guide
Receiving analog calls
The Netopia ISDN Modem can receive incoming analog calls, such
as calls from an ordinary fax machine or pay phone. The ISDN
modem will direct the call to devices connected to the two analog
ports.
You can receive an analog call under the following scenarios:
■If you are using one B channel for a digital data call (such as a
connection to your Internet Service Provider), you can receive
an analog telephone call on the other B channel.
■If you are using one B channel for a digital data call, and
someone calls the number associated with the B channel you
are using, the incoming analog call will receive a busy signal
unless your local switch is an AT&T 5ESS switch. An AT&T 5ESS
switch will let the incoming analog call roll over to the available
B channel.
You cannot receive an analog call:
■When you are using both of the B channels for two analog calls,
an analog call and a digital data call, or for a Multilink PPP
digital data call.
Note: An option called Flexible Call Offering (FCO) or Additional
Call offering (ACO), which is included in the ISDN service from
some telephone companies, allows you to receive an incoming
call while a dual-channel Multilink PPP call is in progress.