Nortel DMS-250 User manual

MWC14 (CSP14) Standard 23.01 March 2001
297-2521-106
Digital Switching Systems
DMS-250
ISDN Reference Manual

Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Digital Switching Systems
DMS-250
ISDN Reference Manual
1997–2001 Northern Telecom
All rights reserved
Printed in the United States of America
NORTHERN TELECOM CONFIDENTIAL: The information contained in this document is the property of Northern
Telecom. Except as specifically authorized in writing by Northern Telecom, the holder of this document shall keep the
information contained herein confidential and shall protect same in whole or in part from disclosure and dissemination to third
parties and use same for evaluation, operation, and maintenance purposes only.
Information is subject to change without notice. Nortel Networks reserves the right to make changes in design or components
as progress in engineering and manufacturing may warrant.
This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC
Rules, and the radio interference regulations of Industry Canada. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at the user’s own expense.
The SL-100 system is certified by the Canadian Standards Association (CSA) with the Nationally Recognized Testing Laborato-
ry (NRTL).
This equipment is capable of providing users with access to interstate providers of operator services through the use of equal
access codes. Modifications by aggregators to alter these capabilities is a violation of the Telephone Operator Consumer
Service Improvement Act of 1990 and Part 68 of the FCC Rules.
DMS
, MAP, NORTEL, NORTEL NETWORKS, NORTHERN TELECOM, NT, and SUPERNODE are trademarks of Nortel
Networks Corporation.
Publication number: 297-2521-106
Product release: MWC14 (CSP14)
Document release: Standard 23.01
Date: March 2001

Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
iii
Publication history
March 2001 Standard 23.01 for software release MWC14 (CSP14). MCI has been
globally replaced with MWC (MCIWorldcom).
The following information has been added:
•RLT/ATP (A60008836)
•Fraud Call Interrrupt (A60008839)
February 2000Standard 22.01 for software release MCI18 (CSP12).
The following information has been added:
•PRI Progress Indicator Transport (A60007169)
April 1999 Standard Release 21.01 for release MCI16 (CSP10).
The following information has been added:
•MAUUI Over Release Message for NCAUUI (AX1408)
•PRI Connected Number Transport (AX1414)
•MAUUI In First Call Clearing Message Before Connect (A60006311)

Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
v
Contents
About this document xv
When to use this document xv
Intended audience xv
How this book is organized xv
Intended audience xvii
Applicability of this document xvii
How to check the version and issue of this document xvii
References in this document xviii
What precautionary messages mean xviii
How commands, parameters, and responses are represented xix
Input prompt (>) xx
Commands and fixed parameters xx
Variables xx
Responses xx
Introduction 1-1
Primary rate interface 1-1
Q.931 signaling protocol 1-2
Protocol overview 1-2
OSI protocol layers 1-2
ISDN protocol layers 1-4
Layer 1 (physical) protocol 1-5
Layer 2 (link) protocols 1-5
Layer 3 (network) protocols 1-6
Layer 4 (application) protocols 1-6
DS-1 configuration 2-1
Introduction 2-1
Hardware configuration 2-1
Commissioning 2-3
Frame formats 2-3
Channel ordering sequence 2-5
Line coding 2-6
Network customer terminating equipment and cross-connect point 2-7
Test equipment requirements 2-9
Performance and maintenance 2-10
Performance group alarms 2-10
Carrier group alarms 2-10
Alarms 2-10
Display fields 2-11

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297-2521-106 Standard 23.01 March 2001
TRAVER enhancements 2-13
Originations on PRA250 trunks 2-13
Datafill trace 2-14
D-channel handler 3-1
Introduction 3-1
Hardware configuration 3-1
Functionality 3-1
Installation 3-2
Loading the D-channel handler from the MAP terminal 3-3
Returning the D-channel handler to service 3-3
Checking the D-channel handler load name 3-3
Verification 3-3
Running internal continuity tests 3-3
Running the read-only memory tests 3-3
Running the external continuity test 3-3
Troubleshooting 3-4
Test equipment 3-4
PRI D-channel backup 3-5
Terminology 3-5
Background 3-5
Configuration for D-channel backup 3-5
MAP commands for D-channel maintenance 3-6
D-channel back-up interactions 3-6
Message structure and function 4-1
Message structure 4-1
Mandatory information elements 4-1
Protocol discriminator 4-1
Call Reference 4-2
Message Type 4-2
Other information elements 4-2
Bearer Capability 4-2
Call State 4-2
Called Party Number 4-2
Called Party Subaddress 4-2
Calling Party Number 4-2
Calling Party Subaddress 4-3
Cause 4-3
Change Status 4-3
Channel Identification 4-3
Congestion Level 4-4
Connected Number 4-4
Display 4-4
Facility 4-4
Generic Digits 4-4
Higher Layer Compatibility 4-4
Information Request 4-4
Lower Layer Compatibility 4-5
More Data 4-5
Network-Specific Facilities 4-5

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Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Notification Indicator 4-6
Original Called Number 4-6
Progress Indicator 4-6
Redirecting Number 4-6
Redirection Number 4-6
Restart Indicator 4-7
Transit Network Selection 4-7
User-to-User 4-7
Locking shift to codesets 4-7
Message functions 4-7
Q.931 message descriptions 4-8
Q.931 message information elements 4-14
Q.932 message descriptions 4-21
Q.932 message information elements 4-22
Congestion and Network Flow Control 4-23
User Congestion 4-23
Network Flow Control 4-23
User Congestion and Network Flow Control Interaction 4-23
Call control procedures 5-1
Introduction 5-1
DMS-250 switch functions and services 5-1
Switch network parameter 5-1
Call establishment at the originating exchange 5-3
User call request 5-3
Call types supported 5-4
Network control system 5-4
Call authorization 5-4
Call translation 5-5
Translation example 5-5
B-channel allocation and negotiation 5-8
Call proceeding and termination 5-9
Call establishment at the terminating exchange 5-10
Network call request with SETUP message 5-10
Selection of PRI B-channel for termination 5-10
Terminations and user responses 5-11
Terminating to a PRI 5-11
Termination to a PBX 5-13
Termination to a non-ISDN trunk 5-13
Termination to Enhanced Voice Services ARU 5-16
Reseller switch setup and release 5-22
Suppcode collection 5-22
Call takedown for normal call clearing 5-24
User-initiated normal call clearing 5-24
Network-initiated normal call clearing 5-25
Disconnection of an EVS call 5-26
Cause and treatment handling 5-29
Standard cause and treatment handling 5-30
Enhanced cause and treatment handling 5-31
Q.931 cause values 5-32
Location codes 5-32

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297-2521-106 Standard 23.01 March 2001
Mapping of cause values to treatment 5-33
Mapping of treatments to cause values 5-35
Exception conditions 5-37
B-channel glare 5-38
B-channel lockout 5-40
No response to SETUP message 5-42
No response after a CALL PROC message 5-43
Protocol violations 5-43
PRI interworking 6-1
Agents 6-1
Originators 6-1
Enhanced digital recorded announcements 6-2
PRI to ISUP 6-2
PRI-to-ISUP-to-PRI 6-4
Non-ISUP trunks 6-7
PRI-to-PTS 6-8
PTS to PRI 6-9
Originating Line Information (OLI) 6-9
OLI delivery on PRI termination 6-10
Feature interaction 7-1
Introduction 7-1
Integrated services access 7-1
Call types supported 7-2
Invalid call types 7-2
Identifying call type 7-2
PRI origination and call type 7-3
PTS origination and terminating PRI call type 7-5
Call type mapping 7-6
Translation and routing options 7-8
Off network dialing 7-12
On network dialing—VNET 7-14
Public speed dialing—DDD/VNET 7-15
Ten-digit routing 7-15
Test calls 7-18
IEC screening and routing 7-18
Restricted usage by date and time 7-18
Incoming exclusion 7-19
Time-of-day routing 7-19
Trunk group class-of-service screening 7-20
Retranslation 7-20
Satellite screening 7-20
Identifying voice/data and transmission rate—bearer capability 7-20
Data calls 7-21
Data call cause handling 7-22
Route advancing 7-23
Identifying call origin—calling number delivery 7-23
SETUP message 7-24
PTS-to-PRI call 7-25
SS7 network interworking 7-25

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Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
PRISM service 7-27
Call processing 7-27
Translation and routing 7-27
VNET services 7-29
Operation overview 7-29
Features 7-29
Dialing plans 7-30
Call processing 7-31
Translation and routing 7-32
SAC service 7-33
800 and 900 service 7-33
Call authorization 7-33
Authorization codes 7-34
Filed hotline numbers 7-35
Security codes 7-35
Calling line identification 7-35
Supplementary/account codes 7-36
Data call suppcode/account code collection 7-36
Overflow call control 7-41
Direct termination overflow 7-41
Enhanced overflow 7-41
Enhanced reorigination 7-42
Originating agencies 7-42
Datafill in TRKGRP 7-42
Network call transfer 7-43
User-to-user service 7-43
Call-associated UUI signaling 7-44
Message-associated UUI signaling 7-46
Datafill 7-48
Call tracing and billing—NCID 7-48
NCID generation 7-49
NCID acceptance and delivery on PRI 7-49
EVS PRI 7-49
Passing the NCID 7-50
NCID screening 7-50
Enhanced voice system audio response unit 7-50
Virtual trunk elimination 7-52
RLT/ATP 7-52
Fraud Call Interrupt 7-54
Interactions 7-56
Datafill 7-57
Dialable Wideband Service 8-1
Introduction 8-1
Hardware requirements 8-1
Trunk types 8-2
Translating and routing 8-3
Route selectors 8-3
Constraints 8-4
Protocol datafill 8-4
Signaling 8-5

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297-2521-106 Standard 23.01 March 2001
ISDN SETUP message 8-5
Selecting a route 8-7
Channel selection grouping 8-7
Channel selection sequence 8-8
Channel availability selection 8-9
Datafill for channel selection 8-10
Datafill values 8-11
Potential routing problems 8-11
Fragmentation 8-12
Glare 8-12
Datafill and subscription parameters 9-1
Parameter groups 9-1
Parameter relationships 9-1
Facility-related interface parameters 9-2
Service-related interface parameters 9-3
Database correlation 9-3
Configuration data correlation 9-3
Layer 1 data correlation 9-3
Layer 2 data correlation 9-4
Layer 3 facility data correlation 9-5
Layer 3 service data correlation 9-6
Datafill tables 9-6
Table CLLI 9-7
Table MCLLICDR 9-10
Table LTCINV 9-11
Table LTCPSINV 9-11
Table CARRMTC 9-12
PRI facility-related tables 9-13
Table TRKGRP 9-14
Table TRKSGRP 9-15
Table TRKMEM 9-16
ITA configuration 9-16
PRI service-related tables 9-16
Table PRIPROF 9-17
Table LTDEF 9-17
Table LTCALLS 9-18
Table LTMAP 9-18
CI command—DISPDCH 9-19
Service verification 10-1
Call setup service over PRI 10-1
Putting PRI-related facilities into service 10-1
TL100 tests over PRI trunks 10-1
T100 test 10-2
TL102 tests over PRI 10-3
Call over a PRI 10-4
Verify data connectivity 10-4
Customer questionnaires 10-4
PBX telecom manager trouble report form 10-4
PBX end-user trouble report form 10-7

Contents xi
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Verification of PRI facility on the DMS-250 switch 10-8
PRI datafill verification 10-8
Interpreting PRI trunk states on the DMS-250 switch 10-8
Interpreting carrier states on the DMS-250 switch 10-10
Interpreting PRI DTCI states 10-12
Interpreting DCH states 10-13
Engineering recommendations 11-1
PRI configurations 11-1
Single DS-1 per PRI 11-1
Single PRI per DS-1 11-1
Usage of non-PRI channels on DS-1 11-1
D-channel handler to DS-1 mapping 11-1
Recommended D-channel handler to DS-1 mapping on DMS-250 DTCI 11-1
Optimal DS-1/D-channel handler card assignments on DMS-250 DTCI 11-2
Signaling terminals 11-2
DTCI port allocation 11-2
DS-1 card locations 11-2
Reliability considerations 11-3
Backup trunk group 11-3
Non-PRI trunks as backup 11-3
Multiple PRI links 11-3
DMS-250 switch loss and level datafill 11-3
DS-1 to DS-30 channel mapping 12-1
ETSI PRI 13-1
Introduction 13-1
Protocol—network mode 13-1
Protocol—user mode 13-2
Messages 13-3
Parameters 13-3
Message formats 13-4
Protocol timers 13-4
Hardware configuration 13-4
DTCOi+ overview 13-4
D-channel handler 13-5
Interworking 13-5
Call processing for ETSI PRI originations 13-5
Identifying call type 13-6
Pretranslation name determination 13-6
OTG and OSID 13-6
B-channel negotiation 13-8
Charge Number/Calling Party Number Delivery 13-8
ANSI PRI 13-11
Standard cause and treatment handling 13-13
VNET services 13-15
Access to NCS/DAP 13-15
Remote access 13-17
Supplementary/account codes 13-17
In-band digit collection—answer supervision 13-18

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297-2521-106 Standard 23.01 March 2001
Variable length private dialing 13-18
Direct termination overflow 13-18
Enhanced overflow 13-19
Registered access calls 13-20
Global flexible SAC 13-20
PRISM services 13-21
Universal translation 13-21
Long call disconnect 13-22
Non-standard routing 13-22
Class of service screening 13-22
Test calls/automatic trunk routing 13-22
Trunk group class-of-service screening 13-22
Data calls 13-22
In-switch account code collection 13-23
User-to-user information services 13-23
NCID 13-23
Dialable Wideband Service 13-23
EIR on ETSI PRI 13-23
Flexcard on ETSI PRI 13-23
Flexcard call processing 13-24
Flexible Card Type 13-25
Pretranslator Per Access Number 13-25
Flexible Dialing Stage 13-26
Selectable Prompts 13-26
Variable Number of Card Digits 13-27
Reorigination 13-28
Routing 13-29
Card service response 13-29
Routing and failure Responses 13-29
Enhanced overflow 13-30
ETSI PRI Terminations by way of Table OPRTEID 13-31
Table OPRTEID Datafill 13-31
NCAUUI 14-1
NCAUUI (Non Call Associated User-to-User Information) 14-1
Non Call Associated User to User Signaling Invocation 14-2
NCAUUI Invocation Acknowledgement 14-2
NCAUUI Invocation Rejection 14-4
Network Rejection 14-5
NCAUUI Congestion and Flow Controls 14-7
Network Flow Control 14-8
User Congestion and Network Flow Control Interaction 14-9
User Congestion and Network Flow Control Interaction 14-10
NCAUUI TSC Clearing 14-11
Data Access Point (DAP) 14-12
NCAUUI (Two switch scenario) 15-1
Overview 15-1
Feature Description 15-1
Connect Timers 15-5
NCAUUI Invocation Negative Acknowledgment 15-7

Contents xiii
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
NCAUUI Congestion and Flow Controls 15-15
PRI Connected Number Transport 16-1
PRI Connected Number Transport 16-1
PRI Progress Indicator Transport 17-1
PRI Progress Indicator Transport 17-1
Processing scenarios for backward call indicators 17-4
Scenario 1: PRI-to-ISUP-to-PRI 17-4
Scenario 2: PRI to ISUP to PTS 17-5
Scenario 3: PTS to ISUP to PRI 17-5
Scenario 4: PRI-to-ISUP-to-PRI 17-6
Scenario 5: PRI-to-ISUP-to-PRI 17-7
Scenario 6: PRI-to-ISUP-to-ISUP 17-8
Migration strategy 17-9
Feature impact 17-9
MAUUI Over Release Message for NCAUUI 18-1
Feature Description 18-1
MAUUI TSC clearing for NCAUUI 18-1
Single Switch Scenario 18-1
Two Switch Scenario 18-5
MAUUI in First Call Clearing Message Before Connect 19-1
Feature synopsis 19-1
Functional overview 19-1
Feature description 19-2
PRI–PRI scenarios 19-3
ISUP-ISUP Scenarios 19-7
PRI-ISUP/ISUP-PRI Interworking Scenarios 19-9
Network Scenarios 19-15
Special Cases 19-17
ETSI PRI 19-21
Billing 19-22
List of terms 20-1

Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
xv
About this document
This document serves as the primary rate interface (PRI) applications hand-
book for DMS-250 switch telecommunications managers and coordinators.
It describes the applications engineered for the PRI connection between a
DMS-250 switch and a private branch exchange (PBX).
When to use this document
This document provides references, procedures, and detailed information
about the following features:
•ISDN hardware
•ISDN messaging
•customer-deliverables
Intended audience
This document provides references, procedures, and detailed information
about ISDN hardware, messaging, PRI applications, and
customer-deliverable features. This document describes the DMS-250
switch hardware configuration and available software features; it is a
reference manual for operating company personnel using the ISUP
DMS-250 switch.
How this book is organized
This document contains the following chapters, followed by a list of terms.
•Chapter 1, “Introduction,” describes channels supported by PRI, defines
PRI applications, and gives an overview of the protocol for open systems
interconnection (OSI) and ISDN layers.
•Chapter 2, “DS-1 configurations,” provides an overview of how a
DMS-250 switch connects a DS-1 trunk to a single-line PBX; describes
the hardware configuration for the DS-1, commissioning details, and
performance and maintenance details. Included is an overview of digital
trunk controller versions and integrated trunk access.
•Chapter 3, “D-channel handler,” describes hardware configuration,
installation, and verification procedures. Also included information
about troubleshooting, test equipment, and PRI D-channel backup
facility.

xvi About this document
297-2521-106 Standard 23.01 March 2001
•Chapter 4, “Message structure and functions,” defines the purpose of
each of the mandatory information elements and other information
elements of messages; describes messages supported for PRI call
processing and their role in call processing. Included are detailed
definitions of Q.931 and Q.932 messages’ information elements
•Chapter 5, “Call control procedures,” describes the call control
procedures used to set up and take down PRI calls, including user or
network parameters.
•Chapter 6, “PRI interworking,” lists the interworking of PRI to various
agents, and describes enhanced digital recorded announcements and PRI
to ISUP interworking.
•Chapter 7, “Feature interaction,” describes the services and features
supported on the PRI interface, including RLP/ATP and Fraud Call
Interrupt.
•Chapter 8, “Dialable Wideband Service,” describes how Dialable
Wideband Service works, including hardware, translation and routing,
and datafilling.
•Chapter 9, “Datafill and subscription parameters,” provides information
on database correlation and describes interdependencies of tables and
datafill order; describes subscription parameter relationships, including
facility, service, and integrated access parameters.
•Chapter 10, “Service verification,” outlines the verification of the
various services and describes steps that guarantee services function
properly and steps to isolate problems.
•Chapter 11, “Engineering recommendations,” provides recommendations
to simplify the configuration and engineering of the ISDN digital trunk
controller PRI.
•Chapter 12, “DS-1 to DS-30 channel mapping,” provides tables that
show mapping of the DS-1 channel to the DS-30.
•Chapter 13, “ETSI PRI,” describes the differences between North
American PRI and European PRI functionality.
•Chapter 14, “NCAUUI” (Non Call Associated User to User
Information), describes the service that provides PRI users at the same
switch with user–to–user communication.
•Chapter 15, “NCAUUI (Two switch scenario),” provides a two switch
scenario of the activated NCAUUI feature.
•Chapter 16, “PRI Connected Number Transport,” describes the flow of
PRI Connected Number Transport across the network.
•Chapter 17, “PRI Progress Indicator Transport,” outlines the purpose of
the progress indicator and maps its location in relation to the originating
switch.

About this document xvii
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
•Chapter 18, “MAUUI Over Release Message for NCAUUI,” describes a
single switch scenario for MAUUI TSC clearing for NCAUUI.
•Chapter 19, “MAUUI in First Call Clearing Message Before Connect,”
provides details on transporting the UUI information element from the
terminating to the originating agent.
Intended audience
This document provides references, procedures, and detailed information
about ISDN, and customer-deliverable features. Specifically, this document
describes how to apply PRI to a network—the DMS-250 switch hardware
configuration and available software features. This document is a reference
manual for operating company personnel using the ISUP DMS-250 switch.
Applicability of this document
This document is written for a DMS-250 office with software release
MWC18. More than one version of this document may exist. To determine
whether you have the latest version of this document, check the release
information in DMS-250 Master Index of Publications.
How to check the version and issue of this document
The version and issue of the document are indicated by numbers, for
example, 01.01.
The first two digits indicate the version. The version number increments
each time the document is updated to support a new software release. For
example, the first release of a document is 01.01. In the next software release
cycle, the first release of the same document is 02.01.
The second two digits indicate the issue. The issue number increments each
time the document is revised, but rereleased in the same software release
cycle. For example, the second release of a document in the same software
release cycle is 01.02.
To determine which version of this document applies to the software in your
office and how documentation for your product is organized, check the
release information in DMS-100 Family Guide to Nortel Publications,
297-1001-001.
This document is written for all DMS-250 Family offices. More than one
version of this document may exist. To determine whether you have the
latest version of this document and how documentation for your product is
organized, check the release information in DMS-100 Family Guide to
Nortel Publications, 297-1001-001.

xviii About this document
297-2521-106 Standard 23.01 March 2001
References in this document
DMS-250 Master Index of Publications is referred to in this document.
•DMS-250 Network Control System Reference Manual, NTP
297-2521-138
•DMS-100 Trunks Maintenance Guide, NTP 297-1001-595
•Integrated Services Digital Network Product Guide, NTP 297-2401-010
•Integrated Services Digital Network Basic Rate Interface Maintenance
Guide, NTP 297-2401-501
•DMS-250 Billing Records Reference Manual, NTP 297-2521-119
•DMS-250 Common Channel Signaling 7 Reference Manual, NTP
297-2521-137
•DMS-250 Operational Measurements Reference Manual, NTP
297-2521-814
•DMS-250 Commands Reference Manual, NTP 297-2521-819
•DMS-250 Logs Reference Manual, NTP 297-2521-840
•DMS-250 Data Schema Reference Manual, NTP 297-2521-851
•DMS-100 Network Management System Reference Manual, NTP
297-1001-453
•DMS-100 Bit Error Rate Performance Testing, NTP 297-1001-533
•DMS-250 Master Index of Publications, NTP 297-2521-001
What precautionary messages mean
The types of precautionary messages used in NT documents include
attention boxes and danger, warning, and caution messages.
An attention box identifies information that is necessary for the proper
performance of a procedure or task or the correct interpretation of
information or data. Danger, warning, and caution messages indicate
possible risks.
Examples of the precautionary messages follow.
ATTENTION Information needed to perform a task