ATT DEFINITY Communications System Generic 3 Instructions Manual

							Integrated Services  Digital  Network (ISDN) — Primary 
Rate Interface
Issue  3   March 1996
3-807
On calls incoming to a DEFINITY system, the connected party’s name is 
provided if the incoming ISDN-PRI trunk g roup is administered to send the 
name to the network.
NOTE:
The connected party may or may not be the party actually called in 
the event that the call is transferred before the connected party 
answers the call.
The display fields that may be used for the ISDN-PRI are as follows:
nName — Maximum of 15 characters
nNumber — Maximum of 15 characters
nMisc ellaneous Call Identification — Maximum of eight characters
nReason for Call Redirection — Maximum of two characters
The display information varies, depending on the type of call, how the call is 
handled (for example, whether it is redirected or not), and what information is 
available on the call. The display information for basic calls (those with just a 
calling and called party) and for redirected calls is given in the following 
paragraphs.
ISDN-PRI Basic Call
A basic ISDN-PR I cal l has both a calling and a called party, and the called party 
answers the call.  When the calling party goes off-hook, a= ap p ears on the 
display. The digits then appear as they are dialed. These digits may be 
overwritten by the trunk group name if the “Outgoing Display” field of the “Trunk 
Group Ad ministration”  form is a dministered as yes. Once the call is answered by 
the called party (or b y a user with a bridged appearance for the called party), the 
displays for the calling and called parties are described below.
nIf both the name and numb er information are available, the displays are as 
follows. The “ MISCID (Miscellaneous Identification)”  field may be blank if 
that information is not provided.
— Calling Party Disp lay
a= CALLED NAME     CALLED NUMBER      MISCID
— Called Party Display
a= CALLING NAME    CALLING NUMBER     MISCID
nIf only the name information is available, the displays are as follows:
— Calling Party Disp lay
a= CALLED NAME                        MISCID
— Called Party Display
a= CALLING NAME                       MISCID 
						

							Feature Descriptions
3-808Issue  3   March 1996 
nIf only the number information is available, the displays are as follows:
— Calling Party Disp lay
a= ANSWERED BY     CALLED NUMBER      MISCID
— Called Party Display
a= CALL FROM       CALLING NUMBER    MISCID
nIf neither the name nor the number information is available, the displays 
are as follows:
— Calling Party Display (shows one of the following, depending on 
administration)
a= DIALED NUMBER                     MISCID
a= TRUNK NAME                        MISCID
— Called Party Display
a= TRUNK NAME                        MISCID
Redirected ISDN-PRI Call
A redirected ISDN-PRI call is a call that has been redirected from the called 
party’s extension by a feature such as Call Coverage, Call Forwarding All Calls, 
Brid g ed Call Ap pearance, or Call Pickup. Once the call is connected, the 
displays for the calling, called, and connected parties are as follows.
— Calling Party Disp lay
a= CONNECTE D  N A M E   C O NNECTE D NU M     M IS CID
— Called Party Display
The following information appears on the display if the called party 
bridges onto the redirected call after it has been answered. In this 
situation, the connected party’s display (given later) shows the same 
information. The calling party’s display is also u pdated if the calling and 
called parties are on the same switch.
a= CONFERENCE   2 
— Connected Party Display
The connected p arty is the party who answers the redirected call. The ‘‘R’’ 
indicates the reason for redirection.
a= CALLING ID    to    CALLED ID          R
The CALLING ID and the CALLED ID may be the name or the number, 
depending on what has b een received from the far end.
CPN/BN to Host Call Identification
The CPN/BN to Host feature enables CPN/BN information to be passed from the 
switch to the ISDN Gateway, so that the ISDN Gateway can forward the 
information to a host for data screen delivery to agents in an ACD split. 
						

							Integrated Services  Digital  Network (ISDN) — Primary 
Rate Interface
Issue  3   March 1996
3-809
By delivering call identification information such as CPN/BN and switch 
information such as the answering agent’s extension to an adjunct network (ISDN 
Gateway), the adjunct can automatically deliver data screens to agents for new 
call arrivals and call transfers.
Figure 3-22 shows a simplified diagram of a CPN/BN to host arrangement. The 
ISDN Gateway is a 3B2 or 6386 computer connected to the switch on one side 
and to a host computer on the other side. The connection to the switch is over a 
synchronous interface with BX.25 protocol.
Figure 3-22. CPN/BN to Host Configuration
Private Network Services
In a ddition to providing access to switched public networks, the ISDN-PRI can 
provide private network services by connecting DEFINITY Generic 1, 2.1, 3, 
System 85 R2V4, or G2.2 systems in an Electronic Tandem Network (ETN) or 
Distributed Communications System (DCS) configuration. This gives customers 
more efficient private networks that support new integrated voice and data 
services. ETN and DCS services are provided as follows:
nETN Se rv i c e s
DEFI NI TY Com munications Systems that function as tandem nodes in an 
ETN can b e interconnected using DS1 trunking facilities and an ISDN-PRI.  
All signaling between the tandem switches is done with the ISDN-PRI 
D-channel and normal ISDN procedures. The ISDN-PRI can also be used 
to connect ETN tandem and main switches. In this case, the main switch 
ISDN-PRI
SID/ANIG1
SWITCHBX.253B2 OR 6386
ISDN
GATEWAYEXISTING
INTERFACEHOST
VOICE
TERMINALDATA
TERMINAL
ACD AGENT POSITION 
						

							Feature Descriptions
3-810Issue  3   March 1996 
collects all of the a d dress digits from local users as well as users at other 
satellite and tributary switches, and originates a call over the ISDN-PRI to 
the tandem switch.
Automatic Alternate Routing (AAR) and Automatic Route Selection (ARS) 
are used with the ISDN-PRI and D S1 trunking facilities to access ETN 
facilities. The AAR and ARS features are used to collect the  dialing 
information for the call that is originated from the main switch.
nDCS Services
ISDN-PRI facilities can be used in a DCS arrangement whenever tie trunks 
are used to connect the DCS nodes.
Most DCS features are not affected by the ISDN-PRI.  Howeve r, the 
ISDN-PRI does have a minor impact on a few of the DCS features, as far 
as the functions that the local and remote switches must perform. Even 
though a DCS feature may be slightly affected in this manner, the use of 
the feature is still the same. If there is a conflict between a DCS message 
and an ISDN-PR I message on a call (for example, the calling extension 
number in the DCS message and the calling party’s number in the 
ISDN-PRI message) the DCS message is used.
Wideband Switching
The primary function of the Wi deband Switc h ing feature is to provide support for 
services that require large bandwidth, such as high speed video conferencing. 
These services have traditionally been handled by dedicated facilities. With  the 
Wideband Switching feature, d e dicated facilities are no longer a requirement for 
these large bandwidth services.
The Wideband Switching feature supports end-to-end connectivity b etween 
customer endpoints at data rates ranging from 128 to 1536 k bps over T1 facilities 
and 128 to 1984 kb ps over E1 facilities. Standard data services for use by 
Wideband Switching are HO (384 k bps), H11 (1536 k b ps), H12 (1920 k b ps), and 
NxDS0. See 
DEFI NI TY Com munications System Generic 3 Wideband Technical 
Reference,
 555-230-230, for more d etail.
Call-by-Call Service Selection
Call-by-Call Service Selection allows the same ISDN-PRI trunk group to carry 
calls to a variety of services or facilities (such as a SDN, MEGACOM 
telecommunications service, MEGACOM 800 service, and so on) and/or carry 
calls using different inter-exchange carriers. This feature is described in detail 
under the Call-by-Call Service Selection feature d escription elsewhere in this 
manual. 
						

							Integrated Services  Digital  Network (ISDN) — Primary 
Rate Interface
Issue  3   March 1996
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Access to Software Defined Data Network 
(SDDN)
With ISDN-PRI, the Software Defined Data Network (SDDN) service may be 
accessed. SDDN provides virtual private line connectivity via the AT&T switched 
network (4ESS switch). The services provided b y SDDN include voice, d ata, and 
video applications. SDDN services complement the Software Defined Network 
(SDN) voice services.
 Access to Switched Digital International (SDI)
SDI provides 64 kbps unrestricted connectivity to international locations via the 
AT&T switched  network. It is also the backbone for the AT&T International ISDN 
network. SDI complements the ACCUNET d igital service already available to 
United States locations. This service can be accessed using the Call-by-Call 
Service Selection feature. SDI can provide economical high sp eed data transfer 
to international locations.
ISDN-PRI Interworking
ISDN-PRI Interworking is the combination of b oth ISDN-PRI trunking facilities and 
non-ISDN-PRI trunking facilities on a call. A non-ISDN-PRI trunking facility is any 
trunk facility supported by the system that does not use the ITU-T recommended 
Q.931 message set for signaling. Non-ISDN-PRI trunking facilities include 
facilities such as Analog trunks, AVD DS1 trunks, and DS1 trunks with 
bit-oriente d signaling (rob b ed-bit or common channel).
The system supports the conversion of ISDN-PRI signaling to non-ISDN-PRI 
in-band signaling and the conversion of non-ISDN-PR I in-band signaling to 
ISDN-PRI signaling for Interworking purposes.
A mixture of ISDN-PRI and non-ISDN-PRI signaling is required in ord er to provide 
end-to-end signaling when different types of trunk facilities are used on a call. 
See Figure 3-23 for an example of Interworking. In this example, a call for 
someone at Switch B comes into Switch A. Interworking allows the ISDN-PRI 
signaling of the call to be converted at Switch A to non-ISDN-PRI in-band 
signaling before the call forwards to Switch B. Even though the call comes into 
Switch A on an ISDN-PRI trunk, Switch  A can send the call to Switch B over a 
non-ISDN-PRI trunk by converting the signaling information.
The system provides accurate CDR billing information on calls that are not 
Interworked. Accuracy of CDR billing information on Interworked calls is 
equivalent to the accuracy provided by the public network.
The system does not support the conversion of DCS feature transparency 
me ss a g i n g  in to ISDN-PR I messaging. Therefore, DCS-provided feature 
transparency is lost when the call leaves the DCS network. The basic call, 
however, still g oes through. 
						

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3-812Issue  3   March 1996 
Figure 3-23. Interworking Example
National ISDN-2 Services
G3V3 and later releases support National ISDN-2 (NI-2), which is desc ribed in 
the TR1268 and TR1270 ISDN-PRI pro t o col sta n dards defined by Bell 
Communications Research (Bellcore). Bellcore TR1268 and TR1270 are a 
superset of the NIU-302 standard and are p art of the National ISDN-2 plan 
defined by the North American ISDN Users Forum.
NI-2 offers many of the same services as the AT&T 4ESS protocol, which was the 
default in G1, G3i, and G3r, and was the protocol for Country 1 (USA) in 
G3i-g lobal and G3V2 and later releases. G3V3 a n d later releases support both 
the 4ESS and the NI-2 protocols and allows you to a dminister which one you wish 
to use. You must administer the p rotocol on the “ DS1 Circuit Pack” form. Refer  to 
the “DS1 Circuit Pack” form in the 
DEFINITY Communications System Generic 3 
Version 4 Imp lementation
, 555-230-655, or DEFINITY Communications System 
Generic 3 V2/V3 Implementation
, 555-230-653, for more information on 
administering ISDN-PRI protocols.
NI-2 provides users with the following services:
nCalling Line Identification
nNon-Facility Associated Signaling
nD-Channel Backup
nWideband Switching
nCall-by-Call Service Selection
Calling Line Identification
Calling Line Identification for NI-2 is essentially Calling Party Number (CPN) 
Identification, as previously described in this section.
CALL FROM
NETWORK TO
SWITCH BISDN-PRI
TRUNKNON-ISDN-PRI
TRUNK
SWITCH B  SWITCH A 
						

							Integrated Services  Digital  Network (ISDN) — Primary 
Rate Interface
Issue  3   March 1996
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Non-Facility Associated Signaling
Non-Facility Associated Signaling (NFAS) allows an ISDN-PRI T1/E1  Interface 
D-channel (signaling channel) to convey signaling information for B-c hannels 
(voice and data channels) on ISDN-PRI T1/E1 f a cilities other than the one 
containing the D-channel. Please refer to the section on Facility and Non-Facility 
Associated Signaling elsewhere in this manual.
D-Channel Backup
D-Channel Backup is p rovided to improve reliability in the event of a signaling 
link failure.  D-Channel Backup is discussed in detail in the section on Facility 
and Non-Facility Associated Signaling elsewhere in this manual.
Wideband Switching
Wideband Switching for NI-2 is essentially the same as that of the AT&T 4ESS 
ISDN-PRI protocol, previously discussed in this section.
Call-by-Call Service Selection
Call-by-Call Service Selection for NI-2 is essentially the same as that for the AT&T 
4ESS ISDN-PRI protocol, previously discussed in this section.
Global ISDN-PRI
The DEFI NI TY s yst em  al s o  provides ISDN-PRI for the g lobal market, based on 
different countries’ requirements. For exam ple, the DEFI NI TY s yst em  G3V3 
includes two separate protocols for connecting to the ISDN-PR I network in 
Germany:
nNational ISDN-PRI Layer 3 protocol defined by FTZ 1 TR 6, based on the 
1983 version of ITU-T R e c omm e n d ations Q.930 and Q.931.
nETS I ISDN (E-DSS1), comp atible with the standards established by the 
European Telecommunications Standard s Institute (ETSI).
Ad d itionally, the DEFINITY system includes QSIG Global Networking — a 
platform that meets the requirements for the European Computer Manufacturers 
Association (ECMA) Private Network Generic Functional Procedures for 
Call-Related supp lementary services. Please refer to the QSIG Networking 
section elsewhere in this manual.
Considerations
With the ISDN-PRI, system users have access to a variety of services that are 
only available through the ISDN.
ISDN-PRI Call Identification Disp lay is provided on a call only if that call is routed 
through all ISDN-PRI facilities. Non-ISDN-PRI fa c ilities do not carry the necessary 
display information. If the called party is at a non-ISDN-PRI facility, the system  
						

							Feature Descriptions
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displays either the dialed d i gits or the trunk group name (depending on 
administration) on the calling party’s display.
ISDN-PRI facilities support equal access to inter-exchange carriers.
Interactions
The following features interact with the Integrated Services Digital Network — 
Primary Rate Interface feature.
nAttendant Display
The information provided by ISDN-PRI Call Identification Display is in 
a d dition to the display features already provided.
When an ISDN-PRI call is redirected to the attendant, and both name and 
number display information is available, the name is displayed on the 
console for the calling and called party identification.
nBrid ged Call Ap pearance
ISDN-PRI Call Id entification Display information is provided at  both the 
primary extension numb er and the extension number with the bridged call 
appearance. Both displays show the same called party information, 
whether the call is made from the primary extension number or the 
bridged call a p pearance. On a call to a primary extension number, the 
calling party’s display shows the identification of the called primary 
extension number, even if the call is answered  by the bridged call 
appearance.
nCall Forwarding All Calls
When an ISDN-PRI call is forwarded, no ISDN-PRI Call I dentification 
Display information is shown on the display of the forwarding extension.
The forward e d-to extension’s display shows information on the calling 
party, called party (if the forwarded-to station is on the same switch), and 
the reason for redirection.
nCall Pickup
When an ISDN-PRI call is answered via Call Pickup, the calling party’s 
display identifies the answering party, the called party’s display identifies 
the calling party, and the answering party’s display identifies both the 
calling and called parties.
nConference — Attendant
A conference call is identified as a conference call with ‘‘n’’ number of 
conferees.  This display information is generated locally and  does not 
change the disp lay of a user on another switch. 
						

							Integrated Services  Digital  Network (ISDN) — Primary 
Rate Interface
Issue  3   March 1996
3-815
nConference — Terminal
A conference call is identified as a conference call with ‘‘n’’ number of 
conferees.  This display information is generated locally and  does not 
change the d isplay of a user on another switch.
nDCS 
If both DCS and ISDN-PRI features are provided over the same facility with 
a DEFINITY system Generic 3, the ISDN-PRI d isplay information is 
displayed in DCS format.
nFRL and TCM
The TCM used to pass on the originating facility’s FRL is sent by ISDN 
facilities in the SETUP  message.
nHold
When an ISDN-PRI call is  placed on Hold, the display of the party who 
activates Hold goes blank and then identifies the newly calling or 
connected party if there is one.  The held party’s display remains 
unchanged.  When the held party is reconnected to the holding party, the 
holding party’s display is updated to indicate the current status of the call.
nHunting
On ISDN-PRI c alls to a hunt group extension, the calling party’s display 
identifies either the group or the group member who answers the call, 
depending on administration.
nTEG  
On I SDN-PR I calls to a TEG, the calling party’s display identifies either the 
group or the group member who answers the call, depending on 
administration.
nTransfer
When an ISDN call is transferred, the display of the party who transfers the 
call goes blank.  The transferred party’s display does not change. The 
display of the transferred-to party identifies the party who transferred the 
call.
When an ISDN call is transferred to a party on the same switch as the 
party who transfers the c all, the information on the display of the party who 
transfers the call is shown on the transferred-to p arty’s display.
Administration
ISDN-PRI is administered on a per-system basis by the System Manager. The 
following items require administration.
nCommunication — Interface Link (G3vs/G3s, G3i, and G3i-global)
nCommunication — Interface Processor (G3vs/G3s, G3i, and G3i-global) 
						

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3-816Issue  3   March 1996 
nDS1 Circuit Pack (for DS1 and E1)
nDS1 Synchronization Plan (for DS1 and E1)
nProcessor Interface Circuit Pack (G3vsV1/G3sV1, and G3iV1)
nISDN-PRI Trunk Group
nGRS Routing Patterns
nSignaling Group (see the Facility and Non-Facility Associated Signaling 
feature d esc ription elsewhere in this document).
The following administration items are required for ISDN-PRI Call Identification 
Display:
nA Direct Distance Dialing CPN Prefix Table which includes the following 
items:
— Extension Length — From 1 through 5
— Extension Code — Defines a set of extensions with the same 
leading digits as the extension code
— CPN Prefix — Used to create a 10 (for G3vsV1/G3sV1, G3iV1, and 
G3rV1) or 0 to 15 (for G3i-Global, G3V2, and later releases) digit 
DDD number for an ISDN-PRI CPN. The CPN prefix can be 10 (for 
G3vsV1/G3sV1, G3iV1, and G3rV1) or 0 to 15 (for G3i-Global and 
G3V2) digits in length.
For G3vsV1/G3sV1, G3iV1, and G3rV1, the sum of the number of 
DDD prefix digits and extension d i gits must be g reater than or 
equal to 10. If the sum is g reater than 10, then the p refix d igits takes 
precedence over the extension digits. The system does not send 
call identification information on calls from extensions that have an 
extension code with the DDD prefix left blank or that have no CPN 
prefix administered.
For G3i-Global, G3V2, and later releases, the sum must be greater 
than or e qual to the administered number of digits to send out.
— Whether to send the calling/connected party number and/or name 
“ (Send Calling Numb er?” , “Send Connected Number?”, and “Send 
Name?”  fields of the “ ISDN-PRI Trunk Group”  form). Setting these 
fields to y (yes), enables the sending of number and/or name, 
respectively, to the other side of the interface for display purposes.
nWhether the group name or member name is displayed on the calling 
party’s display (per Hunt Group and TEG).
The following administration is required for CPN/BN to Host Call Identification:
nSome administration may be required so that the switch receives CPN/BN 
from the originating interface to pass to the ISDN Gateway. If the 
originating switch is another DEFINITY system, the trunk group 
administration on that switch needs to be administered (Send 
Calling/Connected Number? is y) so that CPN info is sent. If the originating