FOREWORD
ITU
(International Telecommunication Union) is the United Nations Specialized
Agency in the field of telecommunications. The ITU Telecommunication
Standardization Sector (ITU-T) is a permanent organ of the ITU. The 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 their turn, produce Recommendations on these topics.
The
approval of Recommendations by the Members of the ITU-T is covered by the
procedure laid down in WTSC Resolution No. 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 term recognized operating agency (ROA) includes any individual, company,
corporation or governmental organization that operates a public correspondence
service. The terms Administration, ROA and
public correspondence are defined in
the Constitution of the ITU (Geneva,
1992).
INTELLECTUAL
PROPERTY RIGHTS
The
ITU draws attention to the possibility that the practice or implementation of
this Recommendation may involve the use of a claimed Intellectual Property
Right. The 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, the ITU had/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.
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ITU-T RECOMMENDATION
Q.764
signalling system no.
7 – isdn user part signalling procedures
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Summary
This Recommendation describes the ISDN User Part
signalling procedures of the set-up and clear down of national and
international ISDN connections used for "ISUP'2000". Actions
common for all types of exchanges are described only once. Different or
additional actions required in an exchange are specified in a separate
subclause applicable to that type of exchange. The procedures specified
in clause 2 relate to basic call (i.e. calls not involving supplementary
services and IN).
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CONTENTS
Page
1
General.....................................................................................................................................
1
1.1
Scope.......................................................................................................................................
1
1.2
References................................................................................................................................
1
1.3
Definitions.................................................................................................................................
2
1.4
Abbreviations............................................................................................................................
2
2
Basic call control and signalling procedures................................................................................
3
2.1
Successful call set-up................................................................................................................
4
2.2
Unsuccessful call set-up...........................................................................................................
26
2.3
Normal call release..................................................................................................................
28
2.4
Suspend, resume.....................................................................................................................
30
2.5
Signalling procedures for connection type allowing fallback.......................................................
31
2.6
Propagation delay determination procedure..............................................................................
34
2.7
Echo control signalling procedures...........................................................................................
37
2.8
Network features....................................................................................................................
47
2.9
Abnormal conditions...............................................................................................................
53
2.10
ISDN User Part signalling congestion control...........................................................................
72
2.11
Automatic congestion control...................................................................................................
72
2.12
Unequipped circuit identification code message (national use)...................................................
73
2.13
ISDN User Part availability control..........................................................................................
74
2.14
MTP Pause/Resume................................................................................................................
74
2.15
Overlength messages...............................................................................................................
75
2.16
Support for Temporary Alternative Routeing (TAR).................................................................
75
2.17
Hop counter procedure...........................................................................................................
75
2.18
Call collect request procedure.................................................................................................
76
2.19
Support for Hard To Reach Network Management functions
2.20 Geodetic
location procedure
Annex A..............................................................................................................................................
77
Annex B –
Figures on basic call control signalling procedures................................................................
81
Annex C –
Examples of echo control signalling procedures....................................................................
85
Annex D –
Examples of signalling procedures for connection type allowing fallback................................
95
Annex E –
Test calls.............................................................................................................................
98
Annex
F – Cause values.......................................................................................................................
98
Annex G –
Start up procedures............................................................................................................
98
Recommendation Q.764
signalling system no.
7 – isdn user part signalling procedures
(revised in 2000)
This Recommendation describes the ISDN User Part
signalling procedures for the set-up and clear down of national and
international ISDN connections. Actions common for all types of exchanges are
described only once. Different or additional actions required in an exchange
are specified in a separate subclause applicable to that type of exchange.
The procedures specified in clause 2 relate to basic call
(i.e. calls not involving supplementary services).
Recommendation Q.761 [18] provides an overview of the
signalling capabilities of the complete ISDN User Part (both basic and
supplementary services).
NOTE – In international operation the use of en bloc or overlap signalling is based on bilateral agreements.
The following ITU-T Recommendations and other references
contain provisions which, through reference in this text, constitute
provisions of this Recommendation. At the time of publication, the editions
indicated were valid. All Recommendations and other references are subject to
revisions; all users of this Recommendation are therefore encouraged to
investigate the possibility of applying the most recent edition of the
Recommendations and other references listed below. A list of the currently
valid ITU-T Recommendations is regularly published.
[1]
CCITT Recommendation D.390 R (1988), Accounting
system in the international automatic telephone service.
[2]
CCITT Recommendation E.172 (1992), ISDN
routeing plan.
[3]
CCITT Recommendation G.131 (1988), Stability
and echo.
[4]
CCITT Recommendation G.711 (1988), Pulse
Code Modulation (PCM) of voice frequencies.
[5]
CCITT Recommendation Q.12 (1988), Overflow
– alternative routeing – rerouteing – automatic repeat attempt.
[6]
CCITT Recommendation Q.33 (1988), Protection
against the effects of faulty transmission on groups of circuits.
[7]
CCITT Recommendation Q.101 (1988), Facilities
provided in international semi-automatic working.
[8]
CCITT Recommendation Q.107 (1988), Standard
sending sequence of forward address information.
[9]
ITU-T Recommendation Q.115 (1997), Logic
for the control of echo control devices. (ISUP'97).
[10]
ITU-T Recommendation Q.118 (1997), Abnormal
conditions special release arrangements.
[11]
ITU-T Recommendation Q.542 (1993), Digital
exchange design objectives – Operations and maintenance.
[12]
ITU-T Recommendation Q.543 (1993), Digital
exchange performance design objectives.
[13]
ITU-T Recommendation Q.704 (1996), Signalling
network functions and messages.
[14]
ITU-T Recommendation Q.706 (1993), Message
transfer part signalling performance.
[15]
CCITT Recommendation Q.724 (1988), Telephone
user part signalling procedures.
[16]
ITU-T Recommendation Q.730 (1997), ISDN
User Part supplementary services.
[17]
Q.730-Series Recommendations,
Stage 3 description for ISDN supplementary services.
[18]
ITU-T Recommendation Q.761 (1997), Signalling
System No. 7 – ISDN User Part, functional description.
[19]
ITU-T Recommendation Q.763 (1997), Signalling
System No. 7 – ISDN User Part formats and codes.
[20]
ITU-T Recommendation Q.766 (1993), Performance
objectives in the integrated services digital network application.
[21]
CCITT Recommendation Q.767 (1991), Application
of the ISDN User Part of CCITT Signalling System No. 7 for international ISDN
interconnections.
[22]
ITU-T Recommendation Q.850 (1993), Use
of the cause and location in digital subscriber Signalling System No. 1 and
Signalling System No. 7 ISDN user part.
[23]
CCITT Recommendation E.412 (1992), Network
management controls.
[24]
ITU-T Recommendation G.704 (1995), Synchronous
frame structures used at 1544, 6312, 2048, 8488 and 44 736 kbit/s
hierarchical levels.
[25]
ITU-T Recommendation E.141 (1993), Instructions
for operators on the operator-assisted international telephone service.
[26]
ITU-T Recommendation Q.733.4 (1993), Stage
3 description for call completion supplementary services using Signalling
System No. 7 – Terminal Portability (TP).
[27] ITU-T Recommendation Q.731.7
(1997), Stage 3 description for number identification supplementary services
using Signalling System No. 7 – Malicious Call Identification (MCID).
Editors note The TSB
secretariat must update the dates in the references above
For the purposes of this Recommendation, the following
definition applies:
See Recommendation Q.761 [18].
This Recommendation uses the following abbreviations.
CCR
Continuity Check Request
CQM
Circuit Group Query Message
CQR
Circuit Group Query Response Message
EC
Echo Control
ECD
Echo Control Device
ECIB
Echo Control Information Backward
ECIBA
Echo Control Information Backward, Additional (ECD availability)
ECIF
Echo Control Information Forward
ECIFA
Echo Control Information Forward, Additional (ECD availability)
ECRB
Echo Control Request Backward (OECD request/IECD request)
ECRF
Echo Control Request Forward (OECD request/IECD request)
HTR
Hard to Reach
IAM
Initial Address Message
IECD
Incoming Echo Control Device
INF
Information Message
INR
Information Request Message
ISDN
Integrated Services Digital Network
i.a.
Incoming Echo Control Device not included but available
i.i.
Incoming Echo Control Device included
i.n.a.
Incoming Echo Control Device not available
i.n.i.
Incoming Echo Control Device not included and not available
i.n.r.
Incoming Echo Control Device not requested
i.r.
Incoming Echo Control Device requested
MCID
Malicious Call Identification
MTP
Message Transfer Part
OECD
Outgoing Echo Control Device
o.a.
Outgoing Echo Control Device not included but available
o.i.
Outgoing Echo Control Device included
o.n.a.
Outgoing Echo Control Device not available
o.n.i.
Outgoing Echo Control Device not included and not available
o.n.r.
Outgoing Echo Control Device not requested
o.r.
Outgoing Echo Control Device requested
PCM
Pulse Code Modulation
SAM
Subsequent Address Message
TAR
Temporary Alternative Routeing
TDMA
Time Division Multiple Access
TTB
Temporary Trunk Blocking
