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

vi Contents
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

Contents vii
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