Allied Telesis OmniConnect ISDN - Manual (Page 20)

OmniConnect / ISDN User’s Manual Page 14
Part number 613-10787-00
numbers attached to a single phone (each ringing the same phone). This helps the user
respond to incoming calls differently based on the number dialed.
3.5.2. ISDN switch types
The OmniConnect/ISDN supports the switch types described in this section. In North
America, telephone companies primarily provide BRI service with AT&T or Northern
Telecom switches
3.5.2.1. National ISDN-1
National ISDN-1 (NI-1) BRI switches comply with established National (United States) ISDN
standards. This type of line is supported by AT&T, Northern Telecom and other
manufacturers’ switches. If possible, this type of BRI line should be ordered from the
telephone company service provider since National ISDN-1 switches are guaranteed to offer
Additional Call Offering (ACO). ACO allows the ISDN user to receive an incoming call
when both B channels are in use.
3.5.2.2. AT&T 5ESS Custom
AT&T 5ESS switches can operate in custom mode, in addition to NI-1 mode (explained
above). Custom mode allows the switch to be configured to operate in either a point-to-point
or a multipoint configuration. Point-to-point configurations support one piece of terminal
equipment on the BRI line and do not require Service Profile Identifiers (SPIDs).
Note: For information on SPIDs, please see the section entitled SPIDs.
It is not possible to support two voice channels simultaneously on a Custom Point-to-Point
link. Therefore, Point-to-Point service only requires the provisioning of one telephone number
for both B channels. Multipoint configurations support multiple pieces of terminal equipment
on the same BRI line and requires SPIDs.
3.5.2.3. Northern Telecom DMS-100 Custom
Northern Telecom DMS-100 switches support a custom mode used with older terminal
equipment in addition to NI-1.
3.5.2.4. EURO-ISDN ISDN BRI switch type
The EURO-ISDN switch type, also known as NET-3, is used in Europe and parts of Asia,
including the United Kingdom, France, Germany, Singapore, and Taiwan.
Note: International ISDN BRI lines are not assigned SPIDs; they are typically assigned a
single Directory Number.
There are two basic NET-3 (EuroISDN) implementation variants, termed NET-3 Asia and
NET-3 Europe. In European variations, the Called Party information is transmitted only in the
Q.931 called party information element, whereas in Asian variants, it is permitted (and
sometimes required) to be transmitted in an optional keypad information element.
3.5.2.5. 1TR6 ISDN BRI switch type
The 1TR6 switch type is used in Germany. The 1TR6 lines can be configured for multiple
subscriber numbers, usually referred to as "extended addressing" in Germany. The line is
usually assigned a group of eight sequential directory numbers that can be used for the