1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.850 (05/98) SERIES Q: SWITCHING AND SIGNALLING Digital subscriber Signalling System No. 1 - General Usage of cause and location in the Digital Subscriber Signalling System No. I and the Signalling System No
2、. 7 ISDN User Part ITU -T Recommend at ion (Previously CCIlT Recommendation) Q.850 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORK1 N G FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN CLAU
3、SES APPLICABLE TO ITU-T STANDARD SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI Q.1-Q.3 Q.4-Q. 59 Q .60-Q .99 Q.100-Q.119 Q.120-Q.249 Q.250-Q.309 Q.310-Q.399 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SY
4、STEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q. 500-Q. 599 Q.600-Q.699 Q.700-Q.849 II DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q. 850-Q. 999 II General Q.850-Q.919 II PUBLIC LAND MOBILE NETWORK Q. 1000-Q.l O99 INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN Q.1 I O
5、O-Q. 1 199 Q.1200-Q.1999 Q.2000-Q.2999 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION Q.850 USAGE OF CAUSE AND LOCATION IN THE DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 AND THE SIGNALLING SYSTEM No. 7 ISDN USER PART Summary This Recommendation defines the f
6、ormat, encoding and semantics of cause information elementdparameters and the usage of the location field, in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN User Part. Many cause values are applicable to both DSS 1 and SS No. 7 ISUP and this Recommendation specif
7、ies the use of each cause value in other Recommendations. Source ITU-T Recommendation Q.850 was revised by ITU-T Study Group 11 (1997-2000) and was approved under the WTSC ResolutionNo. 1 procedure on the 15th of May 1998. FOREWORD IT (International Telecommunication Union) is the United Nations Spe
8、cialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITTJ-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunic
9、ations 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 IT
10、U-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conci
11、seness to indicate both a telecommunication administration and a recognized operating agency. mTELLECTUAL 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
12、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 not received notice of intellectual prop
13、erty, 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. O ITU 1998 All rights reserved. No part of this publication
14、may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation Q.850 (05198) - CONTENTS 1 Scope Cause 2 2.1 Format . 2.2 Codes used in the sub-field of the “Cause“ 2.2.1 2.2.2 2.
15、2.3 2.2.4 2.2.5 2.2.6 2.2.7 Extension indicator (ext.) Coding standard . Location . Recommendation . Cause value (only applicable in the context of Recommendations 4.763 and Q.931) . Diagnostics (only applicable in the context of Recommendations 4.763 and Q.93 i) . Cause definitions . General rules
16、for the handling of the location field Handling of cause and location at the international interface . Procedures for the handling of location values reserved for national use (national option) . Recommendation Q.850 (05198) Page 1 1 1 1 1 2 2 2 3 11 15 22 24 25 . 111 - STD-ITU-T RECMN Q-85U-ENGL 17
17、78 a 48b2571 b53778 477 = ext. Coding standard Spare Location O/ 1 O ext. 1 ext. Cause value 1 Recommendation (Notes 1 and 2) Diagnostic(s) (if any) Recommendation Q.850 3 1 3 a* 4 2 5* 3* USAGE OF CAUSE AND LOCATION IN THE DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 AND THE SIGNALLING SYSTEM No. 7 I
18、SDN USER PART (revised in 1998) 1 Scope This Recommendation defines the format, encoding and semantics of cause information elements/parameters and the usage of the location field, in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN User Part. Many cause values are
19、 applicable to both DSS 1 and SS No. 7 ISUP and this Recommendation specifies the use of each cause value in other Recommendations. 2 Cause 2.1 Format Format of 4.93 1 Cause information element or Q.763/Q.730 Cause indicators parameters contents is shown in Figure 1. 2.2 Codes used in the sub-field
20、of the “Cause“ 2.2.1 Extension indicator (ext.) Bit 8 O 1 last octet - octet continues through the next octet (e.g. octet 1 to la) Recommendation Q.850 (05/98) 1 STD*ITU-T RECMN Q.850-ENGL 1918 E 48L2591 0b53799 325 2.2.2 Coding standard Bits 76 O0 o1 ISO/IEC standard (see Note) - ITU-T standardized
21、 coding, as described below 10 11 national standard (see Note) standard specific to identified location (see Note) NOTE - These other coding standards should be used only when the desired cause value cannot be represented with the IT-T-standardized coding. 2.2.3 Location Bits 4321 O000 user (U) 0001
22、 O010 001 1 transit network (TN) O100 O101 o111 international network (INTL) 1010 1100 reserved for national use 1101 reserved for national use 1110 reserved for national use 1111 reserved for national use All other values are spare. private network serving the local user (LPN) public network servin
23、g the local user (LN) public network serving the remote user (RLN) private network serving the remote user (RPN) network beyond interworking point (BI) 2.2.4 Recommendation Bits 7654321 0000000 Q.93 1 000001 1 x.21 0000100 X.25 0000101 All other values are reserved. public land mobile networks, 4.10
24、3 UQ.105 1 NOTE - If octet including this field is omitted, Recommendation Q.93 1 is assumed. 2 Recommendation Q.850 (05/98) STD-ITU-T RECMN d.85-ENGL 1998 111 LIh2591 Ob53800 977 m 2.2.5 Cause value (only applicable in the context of Recommendations Q.763 and Q.93 1) The cause value is divided into
25、 two fields, a class (bits 5 through 7) and a value within the class (bits 1 through4). 1) The class indicates the general nature of the event. Class (000): normal event Class (001): normal event Class (O1 O): resource unavailable Class (O1 1): service or option not available Class (1 00): service o
26、r option not implemented Class (101): invalid message (e.g. parameter out of range) Class (1 10): protocol error (e.g. unknown message) Class (1 1 1): intenvorking 2) The cause values are listed in Table 1. Recommendation Q.850 (0998) _ 3 3 A 2 3 Y a, EI U .- E 4 u 2 .e o a, O u a, + 1 3 El z b 3 3
27、d O O - O O O 3 O O O - - O O - 3 O O O O O O O O O O O - O O O - O O O - 3 O O m 3 CI 3 3 3 v3 v3 a 4 3 2 - n 3 m N 3 N 3 3 O - M O O O 3 3 3 $: O M O O 3 O O O O 3 3 2 O 2 O 3 - STD-ITU-T RECMN Q.850-ENGL 1778 I m W T J? Y d Y O c x U o .+ * . (u CI 2 m o 8 m d - - 3 E: I O vi Co vl C.l m W W 3 4
28、O 3 vl 9 0 O O c: c: - 3 3 O O d - + O O O I3 i=: IO O d d O - 3 2- 3 c: 3 2 /8 3 3 O - Z -1 Z -1 5 Z 11 5 + 3 r) ? Y 3 5 Y 3 m h Y ? J! Y N E .I On ci- IO a .- os 5. e 2 3 vi v) n 8 Y 2 8 E O O O w 3 J o 3 00 o O O 3 - 2 4 - 2 3 O 3 2 O O o O O O O O 2 3 2 w STD-ITU-T RECMN Q.850-ENGL 1970 II 48b25
29、9L Ob53807 221 I C O E .- Y .L1 E n v) m i O 8 3 3 3 M - 3 3 r- i! - 3 3 3 - 3 3 O d STD*ITU-T RECMN Q* e. or on time-out after the last received digit. 2.2.7.1.22 Cause No. 29 - Facility rejected This cause is returned when a supplementary service requested by the user cannot be provided by the net
30、work. 1.Zb3A.23 CauseNo.30-response to STATUS ENQUIRY This cause is included in the STATUS message when the reason for generating the STATUS message was the prior receipt of a STATUS ENQUIRY message. 2.2.7.1.24 Cause No. 31 - Normal, unspecified This cause is used to report a normal event only when
31、no other cause in the normal class applies. Recommendation Q.850 (05/98) 17 STD-ITU-T RECMN Q-850-ENGL 1998 M Lib257L Ob53815 3TB m 2.2.7.2 Resource unavailable class 2.2.7.2.1 This cause indicates that there is no appropriate circuitkhanne1 presently available to handle the call. Cause No. 34 - No
32、circuitkhannel available 2.2.7.2.2 This cause indicates that the network is not functioning correctly and that the condition is likely to last a relatively long period of time; e.g. immediately re-attempting the call is not likely to be successful. Cause No. 38 - Network out of order 2.2.7.2.3 This
33、cause is included in a STATUS message to indicate that a permanently established frame mode connection is out of service (e.g. due to equipment or section failure) (see Annex NQ.933). Cause No. 39 - Permanent frame mode connection out of service 2.2.7.2.4 This cause is included in a STATUS message t
34、o indicate that a permanently established frame mode connection is operational and capable of carrying user information (see Annex AIQ.933). Cause No. 40 - Permanent frame mode connection operational 2.2.7.2.5 This cause indicates that the network is not functioning correctly and that the condition
35、is not likely to last a long period of time; e.g. the user may wish to try another call attempt almost immediately. Cause No. 41 - Temporary failure 2.2.7.2.6 This cause indicates that the switching equipment generating this cause is experiencing a period of high traffic. Cause No. 42 - Switching eq
36、uipment congestion 2.2.7.2.7 This cause indicates that the network could not deliver access information to the remote user as requested, i.e. user-to-user information, low layer compatibility, high layer compatibility, or sub- address, as indicated in the diagnostic. It is noted that the particular
37、type of access information discarded is optionally included in the diagnostic. Cause No. 43 - Access information discarded 2.2.7.2.8 This cause is returned when the circuit or channel indicated by the requesting entity cannot be provided by the other side of the interface. Cause No. 44 - Requested c
38、ircuitkhannel not available 2.2.7.2.9 This cause indicates that there are no preemptable circuits or that the called user is busy with a call of equal or higher preemptable level. Cause No. 46 - Precedence call blocked 2.2.7.2.10 Cause No. 47 - Resource unavailable, unspecified This cause is used to
39、 report a resource unavailable event only when no other cause in the resource unavailable class applies. 18 Recommendation Q.850 (0998) STD-ITU-T RECMN Q.BCU-ENGL 1798 I LiAb2591 Ob5382b 234 .P 2.2.7.3 Service or option unavailable class 2.2.7.3.1 This cause is used to report that the requested Qual
40、ity of Service, as defined in Recommendation X.213, cannot be provided (e.g. throughput or transit delay cannot be supported). Cause No. 49 - Quality of Service not available 2.2.7.3.2 This cause indicates that the user has requested a supplementary service which is implemented by the equipment whic
41、h generated this cause, but which the user is not authorized to use. Cause No. 50 - Requested facility not subscribed 2.2.7.3.3 Cause No. 53 - Outgoing calls barred within CUG This cause indicates that although the calling party is a member of the CUG for the outgoing CUG call, outgoing calls are no
42、t allowed for this member of the CUG. 2.2.7.3.4 This cause indicates that although the called party is a member of the CUG for the incoming CUG call, incoming calls are not allowed to this member of the CUG. Cause No. 55 - Incoming calls barred within CUG 2.2.7.3.5 Cause No. 57 - Bearer capability n
43、ot authorized This cause indicates that the user has requested a bearer capability which is implemented by the equipment which generated this cause but the user is not authorized to use. 2.2.7.3.6 This cause indicates that the user has requested a bearer capability which is implemented by the equipm
44、ent which generated this cause but which is not available at this time. Cause No. 58 - Bearer capability not presently available 2.2.7.3.7 Cause No. 62 - Inconsistency in designated outgoing access information and subscriber class This cause indicates that there is an inconsistency in the designated
45、 outgoing access information and subscriber class. 2.2.7.3.8 This cause is used to report a service or option not available event only when no other cause in the service or option not available class applies. Cause No. 63 - Service or option not available, unspecified 2.2.7.4 Service or option not i
46、mplemented class 2.2.7.4.1 This cause indicates that the equipment sending this cause does not support the bearer capability requested. Cause No. 65 - Bearer capability not implemented 2.2.7.4.2 This cause indicates that the equipment sending this cause does not support the channel type requested. C
47、ause No. 66 - Channel type not implemented 2.2.7.4.3 This cause indicates that the equipment sending this cause does not support the requested supplementary service. Cause No. 69 - Requested facility not implemented Recommendation Q.850 (05/98) 19 STD.ITU-T RECMN Q.850-ENGL 1998 81 48b2591 Ob53817 1
48、70 a 2.2.7.4.4 Cause No. 70 - Only restricted digital information bearer capability is available (national use) This cause indicates that the calling party has requested an unrestricted bearer service but that the equipment sending this cause only supports the restricted version of the requested bea
49、rer capability. 2.2.7.4.5 This cause is used to report a service or option not implemented event only when no other cause in the service or option not implemented class applies. Cause No. 79 - Service or option not implemented, unspecified 2.2.7.5 Invalid message (e.g. parameter out of range) class 2.2.7.5.1 This cause indicates that the equipment sending this cause has received a message with a call reference which is not currently in use on the user-network interface. Cause No. 81 - Invalid call reference value 2.2.7.5.2 This cause indicates that t
