ITU-T Q 2959-1996 Digital Subscriber Signalling System No 2 - Call Priority《NO 2数字用户信令系统 呼叫优先》.pdf
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1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2959 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access si g na I I i n g (07196) Digital subscriber signalling system No. 2 - Call priority ITU-T Recommendation Q.2
2、959 (Previously CCITT Recommendation) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORK
3、ING Q. 1-Q.3 Q.4-Q . 59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI Q.60-(2.99 Q. 1 OO-Q. 1 1 9 Q.250-4.309 Q.310-Q.399 SPECIFICATION OF SIGNALLING SYSTEMS No. 4
4、 AND No. 5 Q.120-Q.249 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIG I TAL EXCHANGES Q.400-Q.499 Q. 50O-Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600-Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700-Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850-Q.999 PUBLIC LAND MOBILE NETWORK Q. 1 OOO-Q
5、. 1 O99 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100-Q.1199 INTELLIGENT NETWORK Q.12004.1999 BROADBAND ISDN Q.2000-(2.2999 General aspects Q.2000-Q.2099 ATM adaptation layer Q.2100-Q.2199 Signalling network protocols Q .2200-Q.2599 Common aspects of B-ISDN application protocols for access signa
6、lling and Q.2600-Q.2699 network signalling and interworking B-ISDN application protocols of the network Q.2700-Q.2899 N application prot For further details, please refir to ITU-T List of Recommendations. COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information
7、Handling ServicesITU-T RECOMMENDATION 4.2959 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - CALL PRIORITY Summary This Recommendation defines the operation of the Digital Subscriber Signalling System No. 2 (DSS 2) for the handling of Call priority that may be provided, as a service provider option, fo
8、r Basic call and connection control at the TB or at the coincident SB and TB reference point of the User- Network Interface of the Broadband-Integrated Services Digital Network (B-ISDN). The call priority capability defined in this Recommendation allows for preferential treatment of high priority ca
9、lls during network congestions, based on the priority level allocated to the call. Source ITU-T Recommendation 4.2959 was prepared by ITU-T Study Group 11 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 9th of July 1996. COPYRIGHT International Telecommunications Union/
10、ITU TelecommunicationsLicensed by Information Handling ServicesFOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The IT Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ZTU. The ITLJ-T is resp
11、onsible 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 th
12、e ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITLJ-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fali within ITU-Ts purview, the necessav stan
13、dards are prepared on a collaborative basis with IS0 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 The ITU draws attention to the possib
14、ility 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 ITLJ members or others outside of t
15、he Recommendation development process. As of the date of approval of this Recommendation, the ITU hadhad 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 lat
16、est information and are therefore strongly urged to consult the TSB patent database. O ITLJ 1997 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 f
17、rom the IT. 11 Recommendation 4.2959 (07/96) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services STD-ITU-T RECMN Q.2959-ENGL B99b 48b259L Ob29707 Ol m 1 2 3 4 5 5.1 5.2 5.3 6 6.1 6.2 6.3 7 7.1 7.2 8 8.1 8.2 9 9.1 9.2 10 11 11.1 11.2 11.3 1
18、2 13 14 CONTENTS Scope References Definitions Abbreviations . Description . Application to interface structure . Capabilities supported by this Recommendation . General overview Operational requirements . Provision and withdrawal . Requirements on the originating network side . Requirements on the d
19、estination network side . Primitive definitions and state definitions Primitive definitions . State definitions Coding requirements Messages . 8.1.1 Modification of messages in Recommendation Q.293 1 . Information elements 8.2.1 Priority information element . Signalling procedures at the coincident
20、SB and TB reference points . Procedure at originating UNI . Procedure at destination UNI . Procedures at the TB reference point for intenvorking with private B-ISDNs . Intenvorking with other networks Intenvorking with CS-1 networks Interworking with DSS 1 Intenvorking with networks that do not supp
21、ort Call Priority Handling Interaction with supplementary services Parameter values . Dynamic description (SDLs) Page 1 1 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 4 5 5 5 5 6 6 6 6 6 6 7 STD-ITU-T RECMN Q.2957-ENGL L99b 4Bb2591 Ob27708 T2b W COPYRIGHT International Telecommunications Union/ITU Telecommunic
22、ationsLicensed by Information Handling ServicesSTD-ITU-T RECMN Q=2959-ENGL L99b D 48bZ.591 Ob29708 T2b . . ?“a“ v COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesRecommendation Q.2959 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - CALL PR
23、IORITY (Geneva, 1996) 1 Scope This Recommendation specifies the messages, information elements and procedures needed to support priority treatment of calls on the User-Network Interface (UNI). Specifically, the following optional capabilities are provided: - The originating user may provide priority
24、 information for each call setup request. If not provided, the network shall include the priority information for the lowest priority. The originating side of the network shall provide for screening of the priority to ensure that the user does not exceed the highest assigned priority level. The netw
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