INTERNATIONAL TELECOMMUNICATION UNION
Q.763
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(12/1999)
SERIES Q: SWITCHING AND SIGNALLING
Specifications of Signalling System No. 7 – ISDN user part
Signalling System No. 7 – ISDN user part
formats and codes
ITU-T Recommendation Q.763
(Formerly CCITT Recommendation)
ITU-T Q-SERIES RECOMMENDATIONS
SWITCHING AND SIGNALLING
SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1–Q.3
INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4–Q.59
FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60–Q.99
CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100–Q.119
SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 Q.120–Q.249
SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250–Q.309
SPECIFICATIONS OF SIGNALLING SYSTEM R1 Q.310–Q.399
SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400–Q.499
DIGITAL EXCHANGES Q.500–Q.599
INTERWORKING OF SIGNALLING SYSTEMS Q.600–Q.699
SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700–Q.849
General Q.700
Message transfer part (MTP) Q.701–Q.709
Signalling connection control part (SCCP) Q.711–Q.719
Telephone user part (TUP) Q.720–Q.729
ISDN supplementary services Q.730–Q.739
Data user part Q.740–Q.749
Signalling System No. 7 management Q.750–Q.759
ISDN user part Q.760–Q.769
Transaction capabilities application part Q.770–Q.779
Test specification Q.780–Q.799
Q3 interface Q.800–Q.849
DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850–Q.999
PUBLIC LAND MOBILE NETWORK Q.1000–Q.1099
INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100–Q.1199
INTELLIGENT NETWORK Q.1200–Q.1699
SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700–Q.1799
BROADBAND ISDN Q.2000–Q.2999
For further details, please refer to the list of ITU-T Recommendations.
ITU-T Q.763 (12/1999) i
ITU-T Recommendation Q.763
Signalling System No. 7 −
−−
− ISDN user part formats and codes
Summary
This Recommendation specifies the formats and codes of the ISDN user part messages and
parameters required to support basic bearer services and supplementary services.
Source
ITU-T Recommendation Q.763 was revised by ITU-T Study Group 11 (1997-2000) and approved
under the WTSC Resolution 1 procedure on 3 December 1999.
ii ITU-T Q.763 (12/1999)
FOREWORD
The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of
ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations
on them with a view to standardizing telecommunications on a worldwide basis.
The World Telecommunication Standardization Conference (WTSC), which meets every four years,
establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these
topics.
The approval of ITU-T Recommendations is covered by the procedure laid down in WTSC Resolution 1.
In some areas of information technology which fall within ITU-T’s purview, the necessary standards are
prepared on a collaborative basis with ISO and IEC.
NOTE
In this Recommendation, the expression "Administration" is used for conciseness to indicate both a
telecommunication administration and a recognized operating agency.
INTELLECTUAL PROPERTY RIGHTS
ITU draws attention to the possibility that the practice or implementation of this Recommendation may
involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence,
validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others
outside of the Recommendation development process.
As of the date of approval of this Recommendation, ITU had not received notice of intellectual property,
protected by patents, which may be required to implement this Recommendation. However, implementors are
cautioned that this may not represent the latest information and are therefore strongly urged to consult the
TSB patent database.
ã ITU 2001
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from ITU.
ITU-T Q.763 (12/1999) iii
CONTENTS
Page
0 Scope, references, definitions, abbreviations.............................................................. 1
0.1 Scope........................................................................................................................... 1
0.2 References................................................................................................................... 1
0.3 Terms and definitions ................................................................................................. 1
0.4 Abbreviations.............................................................................................................. 2
1 General coding principles ........................................................................................... 3
1.1 Routing label............................................................................................................... 4
1.2 Circuit identification code .......................................................................................... 4
1.3 Message type code ...................................................................................................... 11
1.4 Formatting principles.................................................................................................. 12
1.5 Mandatory fixed part................................................................................................... 12
1.6 Mandatory variable part .............................................................................................. 13
1.7 Optional part ............................................................................................................... 13
1.8 End of optional parameters octet ................................................................................ 13
1.9 Order of transmission.................................................................................................. 13
1.10 Coding of spare bits .................................................................................................... 14
1.11 National message types and parameters...................................................................... 14
1.12 Rules for the allocation of message types codes and parameter name codes ............. 15
1.13 Meaning of "spare" codes and "reserved" codes......................................................... 15
2 Parameter codes .......................................................................................................... 15
2.1 Message type codes..................................................................................................... 15
2.2 Coding of the length indicator .................................................................................... 15
2.3 Coding of the pointers................................................................................................. 15
3 ISDN user part parameters.......................................................................................... 16
3.1 Parameter names ......................................................................................................... 16
3.2 Access delivery information ....................................................................................... 18
3.3 Access transport .......................................................................................................... 19
3.4 Automatic congestion level......................................................................................... 19
3.5 Backward call indicators............................................................................................. 19
3.6 Call diversion information .......................................................................................... 21
3.7 Call history information.............................................................................................. 22
3.8 Call reference (national use) ....................................................................................... 22
3.9 Called party number.................................................................................................... 22
3.10 Calling party number .................................................................................................. 24
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