Setting Up Phone Numbers; Using Multiple Subscriber Numbers - Zoom ISDN TA/V.34 Owner's Manual

NT1 device when you order ISDN service. The NT1 typically has from
one to eight connections through something called an S/T bus, which
provides a physical connection point to ISDN equipment such as the
TA/V.34 or TA, ISDN telephones, and so on. The TA/V.34 or TA has a
built-in S/T interface for connection to the NT1 device.
If you are connecting via a Private Branch Exchange (PBX), there is a
Network Termination 2 (NT2) device that is part of your PBX
equipment and serves the same function as the NT1 device; contact
your PBX vendor for details.

Setting Up Phone Numbers

The TA/V.34 or TA you have purchased has multiple functions. For
example, the TA has data capabilities as well as voice capabilities.
Both the ISDN line and the TA need to be configured to distinguish
between the two capabilities. This distinction is made by requiring
different phone numbers, one for each capability.
The configuration varies depending on where the ISDN product will be
installed. But regardless of where the installation will take place, there
are two basic options to choose from.
One option is to have multiple numbers, called Directory Numbers
(DNs), one for each device or capability. This is typically referred to as
Multiple Subscriber Numbers (MSNs). The other option is for various
devices on the line to share a single Directory Number, with an
extension number, or "SubAddress," for each.

Using Multiple Subscriber Numbers

If you are in North America, this is the option you should choose to set
up your ISDN product (TA or TA/V.34). We have made it very simple
for you to request this service by setting up an order package that is
designed to work with your new ISDN product. It is called the ISDN
Order Code or IOC. For more details about the IOC, please refer to the
Service Installation flyer included with your package.
If you are installing an ISDN line outside of North America, we
recommend that you take advantage of the multiple subscriber numbers
by simply ordering your ISDN line with the MSN option, if it is
available. If you are asked "How many numbers do you need?" and the
TA or the TA/V.34 is the only product you will connect to the line, then
ask for MSN with two DNs. Otherwise, you will need three or more
DNs depending on your installation.
Chapter 1 Introduction 9