PRI Cause Vaule文档格式.docx

1、Q.120Q.249SPECIFICATIONS OF SIGNALLING SYSTEM No. 6Q.250Q.309SPECIFICATIONS OF SIGNALLING SYSTEM R1Q.310Q.399SPECIFICATIONS OF SIGNALLING SYSTEM R2Q.400Q.499DIGITAL EXCHANGESQ.500Q.599INTERWORKING OF SIGNALLING SYSTEMSQ.600Q.699SPECIFICATIONS OF SIGNALLING SYSTEM No. 7Q.700Q.849DIGITAL SUBSCRIBER SI

2、GNALLING SYSTEM No. 1Q.850Q.999GeneralQ.850Q.919PUBLIC LAND MOBILE NETWORKQ.1000Q.1099INTERWORKING WITH SATELLITE MOBILE SYSTEMSQ.1100Q.1199INTELLIGENT NETWORKQ.1200Q.1999BROADBAND ISDNQ.2000Q.2999For further details, please refer to ITU-T List of Recommendations.ITU-T RECOMMENDATION Q.850USAGE OF C

3、AUSE AND LOCATION IN THE DIGITAl SUBSCRIBER SIGNALLING SYSTEM No. 1 AND THE SIGNALLINGSYSTEM No. 7 ISDN USER PARTSummaryThis Recommendation defines the format, encoding and semantics of cause information elements/parameters and the usage of the location field, in the Digital Subscriber Signalling Sy

4、stem 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 specifies the use of each cause value in other Recommendations.SourceITU-T Recommendation Q.850 was revised by ITU-T Study Group 11 （1997-2000） and was

5、approved under the WTSC Resolution No. 1 procedure on the 15th of May 1998.FOREWORDITU （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 IT

6、U-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 s

7、tudy by the ITUT Study Groups which, in their turn, produce Recommendations on these topics.The approval of Recommendations by the Members of the ITUT is covered by the procedure laid down in WTSC ResolutionNo.1.In some areas of information technology which fall within ITU-Ts purview, the necessary

8、standards are prepared on a collaborative basis with ISO and IEC.NOTEIn this Recommendation, the expression Administration is used for conciseness to indicate both a telecommunication administration and a recognized operating agency.INTELLECTUAL PROPERTY RIGHTSThe ITU draws attention to the possibil

9、ity 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

10、Recommendation development process.As of the date of approval of this Recommendation, the 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 inf

11、ormation and are therefore strongly urged to consult the TSB patent database.ITU1998All 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 the ITU.C

12、ONTENTS Page1 Scope 12 Cause 12.1 Format 12.2 Codes used in the sub-field of the Cause 12.2.1 Extension indicator （ext.） 12.2.2 Coding standard 22.2.3 Location 22.2.4 Recommendation 22.2.5 Cause value （only applicable in the context of Recommendations Q.763 and Q.931） 32.2.6 Diagnostics （only applic

13、able in the context of Recommendations Q.763and Q.931）. 112.2.7 Cause definitions 153 General rules for the handling of the location field 224 Handling of cause and location at the international interface 245 Procedures for the handling of location values reserved for national use （national option）

14、25Recommendation Q.850（revised in 1998）1 Scope2 Cause2.1 FormatFormat of Q.931 Cause information element or Q.763/Q.730 Cause indicators parameters contents is shown in Figure 1.Octet87654321（Note 3）Q.931 Q.763ext.0/1Coding standardSpareLocation3 1Recommendation （Notes 1 and 2） 3a*Cause value4 2Diag

15、nostic（s） （if any）5* 3*NOTE 1 If the default applies for the Recommendation field, octet including this field shall be omitted.NOTE 2 The Recommendation field is not supported by the ISUP. The default interpretation for ISUP isQ.763.NOTE 3 Optional octets are marked with asterisks （*）.Figure 1/Q.850

16、 Format of 2.2.1 Extension indicator （ext.） Bit 80 octet continues through the next octet （e.g. octet 1 to 1a）1 last octet2.2.2 Coding standard Bits 7 60 0 ITU-T standardized coding, as described below0 1 ISO/IEC standard （see Note）1 0 national standard （see Note）1 1 standard specific to identified

17、location （see Note）NOTE These other coding standards should be used only when the desired cause value cannot be represented with the ITU-T-standardized coding.2.2.3 Location 4 3 2 10 0 0 0 user （U）0 0 0 1 private network serving the local user （LPN）0 0 1 0 public network serving the local user （LN）0

18、 0 1 1 transit network （TN）0 1 0 0 public network serving the remote user （RLN）0 1 0 1 private network serving the remote user （RPN）0 1 1 1 international network （INTL）1 0 1 0 network beyond interworking point （BI）1 1 0 0 reserved for national use1 1 0 1 reserved for national use1 1 1 0 reserved for

19、 national use1 1 1 1 reserved for national use All other values are spare.2.2.4 Recommendation 7 6 5 4 3 2 1 0 0 0 0 0 0 0 Q.931 0 0 0 0 0 1 1 X.21 0 0 0 0 1 0 0 X.25 0 0 0 0 1 0 1 public land mobile networks, Q.1031/Q.1051 All other values are reserved.NOTE If octet including this field is omitted,

20、 Recommendation Q.931 is assumed.2.2.5 Cause value （only applicable in the context of Recommendations Q.763 and Q.931）The cause value is divided into two fields, a class （bits 5 through 7） and a value within the class （bits 1 through 4）. 1） The class indicates the general nature of the event. Class

21、（000）: normal event Class （001）: Class （010）: resource unavailable Class （011）: service or option not available Class （100）: service or option not implemented Class （101）: invalid message （e.g. parameter out of range） Class （110）: protocol error （e.g. unknown message） Class （111）: interworking 2） Th

22、e cause values are listed in Table 1.Table 1/Q.850 Cause information element/parameterCauseDefinitionDiagnosticsApplicationReferenceRemarksClassValueNo.（Note 1）（Note 2）0000001Unallocated （unassigned） numberConditionDSS 1, ISUPQ.931U, RPN, LNRLN, TN, INTLNo route by digit analysis0010No route to spec

23、ified transit networkTransit network identifyDSS 1, ISUP（NU）LN, TN0011No route to destination0100Send special information toneISUPClause 7/Q.350101Misdialled trunk prefixISUP（NU）0110Channel unacceptableDSS 1LN0111Call awarded and being delivered in an established channel1000PreemptionQ.735.3Q.955.3M

24、LPP10019Preemption circuit reserved for reuse001000016Normal call clearingQ.931,2.3/Q.764U, RPN17User busyCCBS indicatorQ.931, Q.732Q.733.3U, RPN, RLNBasic call and call diversion services18No user respondingRLNCall diversion services19No answer from user （user alerted）2.1.4/Q.764 2.9.8.3/Q.764 Expiry of waiting ANM timer （T9）Q.73220Subscriber absentMobile applicationTable 1/Q.850 Cause information element/parameter （continued）D