ITU-T Q 733 5-1999 Stage 3 description for call completion supplementary services using Signalling System No 7 Completion of Calls on No Reply (Study Group 11 42 pp)《使用7号信令系统的呼叫提供补.pdf

1、- STD-ITU-T RECMN Q.733.5-ENGL 3977 4862573 Oh718b7 718 SBI INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECT0 R OF ITU Q.733.5 SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 - ISDN su p p le me n ta ry services (I 2/99) Stage 3 descript

2、ion for call completion supplementary services using Signalling System No. 7: Completion of Calls on No Reply ITU -T Recommendation Q. 733.5 (Previously CCITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATI

3、C AND SEMI-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIG ITAL EXCHANGES INTERWORKING OF SIGNAL

4、LING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS General Message transfer part (MTP) Signalling connection control part (SCCP) TeleDhone user part (TUP) Q.1-Q.3 Q.4-Q.59 Q .60-Q.99 Q.100-Q.119 Q. 1 20-Q .249 Q.250-Q.309 Q.310-Q.399 Q.400-Q.499 Q.500

5、-Q.599 Q .600-Q . 699 Q.700-Q.849 Q.700 Q.701-Q.709 Q.711-Q.719 Q .720-Q.729 Data user part Signalling System No. 7 management ISDN user part Transaction capabilities application part Test specification Q3 interface DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING W

6、ITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 BROADBAND ISDN Q .740-Q . 749 Q. 750-Q. 759 Q .760-Q . 769 Q. 770-Q. 779 Q.780-Q.799 Q.800-Q.849 Q .850-Q . 999 Q. 1000-Q.l O99 Q.1100-Q.l I99 Q. 1200-Q. 1699 Q. 1700-Q. 1799 Q.2000-Q.2999 For further

7、 deiads, please refr io ITU-TList of Recommendations. STD-ITU-T RECMN Q.733.5-ENGL $999 H Y862591 ObiLBb9 590 BW ITU-T RECOMMENDATION 4.733.5 STAGE 3 DESCRIPTION FOR CALL COMPLETION SUPPLEMENTARY SERVICES USING SIGNALLING SYSTEM No. 7: COMPLETION OF CALLS ON NO REPLY Summary The Completion of Calls

8、on No Reply supplementary service (CCNR) enables a calling user A, upon encountering a destination B which does not answer the call (No Reply), to be notified when the destination B becomes not busy all users of this Recommendation are therefore encouraged to investigate the possibility of applying

9、the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. CCITT Recommendation E. 164 (1 991), Numberingplan for the ISDN era. ITU-T Recommendation 1.1 12 (1993), Vocabulary of termsfor ISDNs. CCITT R

10、ecommendation I. 130 (1988), Method for the characterization of telecornmunication services supported by an ISDN and network capabilities of an ISDN. ITU-T Recommendation 1.21 O (1993), Principles of telecommunication services supported by an ISDN and the means to describe them. CCITT Recommendation

11、 1.22 1 (1988), Common speciJic characteristics of services. ITU-T Recornendations X.680-X.683 (1994) I ISO/IEC 8824 (parts 1 to 3):1995, Specification of Abstract Syntax Notation One (ASN. I). ITU-T Recommendations 4.71 1-4.714, Speczjkations of Signalling System No. 7 - Signalling connection contr

12、ol part. ITU-T Recommendations 4.771 -4.775, Specijkations of Signalling System No. 7 - Transaction capabilities application part. CCITT Recommendation 4.767 (1991), Application of the ISDN user part of CCITT Signalling System No. 7 for international ISDN interconnections. ITU-T Recommendations 4.76

13、1-4.764 (1999), Signalling System No. 7 - ISDN userpart. ITU-T Recommendation Q.730 (i 999), ISDN user part supplementary services. STD*ITU-T RECMN Q.733.5-EMGL Lqqq 98625L Ob71875 894 lW ITU-T Recommendation 1.253.4 (1 996), Cull completion supplementary services: Completion of calls on no reply. I

14、TU-T Recommendation Q.733.3 (1997), Stage 3 description for call completion supplementary services using Signalling System No. 7: Completion of calls to busy subscriber (CCBS). ITU-T Recommendation 4.953.5 (1999), Stage 3 description for call completion supplementa y sewices using DSSl: Completion o

15、f Calls on No Reply (CCNR). CCITT Recommendation 1.230 (1 988), DeJinition of bearer service categories. CCITT Recommendation 1.240 (1 988), Definition of teleservice. CCITT Recommendation F.72 1 (1 992), Videotelephony teleservice for ISDN. ITU-T Recommendation 4.71 5 (1996), Signalling connection

16、control part user guide. ITU-T Recommendation X.690 (1997) I ISO/IEC 8825-1 :1998, Information technology - ASN. 1 encoding rules: SpeciJcation of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER). Definitions The following terms i.e. a) through m) are

17、 defined in Recommendation 1.253.4 12. Abbreviated timer names are defined in the brackets: a) User A b) Destination B c) CCNR recall d) CCNR call e) Busy o Free g) CCNR busy. In addition, a CCBS recall pending on user A is also considered as CCNR busy: h) Retention timer (CCNR-T1) i) j) CCNR recall

18、 timer (CCNR-T4) k) 1) CCNR request m) Compatible terminal This Recommendation defines the following terms: 3.1 destination B (i.e. at the entity addressed in the original call) and any user at destination B either: - - - - clears an outgoing call. 3.2 retain option: The retain option, if supported

19、in both the originating and destination network, will maintain the CCNR request in the destination B queue, if a CCNR call has failed due to destination busy condition or because the destination B does not answer the CCNR call. CCNR service duration timer (CCNR-T3) Destination B idle guard timer (CC

20、NR-T8) activity: The activity condition applies if at least one CCNR request is in the queue at initiates an outgoing call; or answers an incoming call; or clears an established call; or STDmITU-T RECMN Q.733.5-ENGL 1999 48b2591 067187b 720 3.3 long-term denial: The network cannot accept user As req

21、uest to activate the CCNR supplementary service and a later attempt to activate the CCNR supplementary service for the same destination B will also be rejected. 3.4 short-term denial: The network temporarily cannot accept user As request to activate the CCNR supplementary service. A later attempt to

22、 activate the CCNR supplementary service for the same destination B may succeed. 3.5 CCNR call indicator: Information sent in the forward direction, used in a CCNR supplementary service call Set-up to distinguish this call from an ordinary call at the destination local exchange. This indicator is ca

23、rried in the CCSS parameter in the IAM. 3.6 CCNR possible indicator: Indicator used in the CCNR Possible Indicator parameter in the ACWCPG to indicate the possibility to invoke a possible succeeding CCNR service request. 3.7 destination B does not answer the CCNR call: After ACM (subscriber fiee)/CP

24、G (alerting), either the calling user releases or a network release in forward or backward direction takes place. 4 Abbreviations This Recommendation uses the following abbreviations: ACM ANM ASE ASN. 1 ATP CCBS ccm CCSS CFB CFNR CFU CLI CON CPG DLE DSS1 GT HLC IAM IPI ISDN ISPBX ISUP Address Comple

25、te Message Answer Message Application Service Element Abstract Syntax Notation One Access Transport Parameter Completion of Calls to Busy Subscriber (CCBS) supplementary service Completion of Calls on No Reply (CCNR) supplementary service Call Completion Service Set-up Call Forwarding Busy Call Forw

26、arding No Reply Call Forwarding Unconditional Calling Line Identification Connect message Call Progress message Destination Local Exchange Digital Subscriber Signalling System No. 1 Global Title High Layer Compatibility Initial Address Message ISDN user part Preference Indicator Integrated Services

27、Digital Network Integrated Services Private Branch Exchange Integrated Services digital network User Part STD-ITU-T RECflN Q.733.5-ENGL 1999 IBL 48b2591 Ob71877 bb7 LLC Low Layer Compatibility OLE Originating Local Exchange ou Originating User PSTN Public Switched Telephone Network REL Release Messa

28、ge RLC Release Complete Message SCCP Signalling Connection Control part SDL SPC SSN SUB TC TE TU us1 5 1) 2) 6 6.1 Specification and Description Language Signalling Point Code Sub-system Number Sub-addressing Transaction Capabilities Transit Exchange Terminating User User Service Information Convent

29、ions The naming conventions for ASN.l symbols as described in 6 are applied (e.g. CcnrRequest operation, calledFartyNumber parameter, CalledPartyNumber data type). The name of each element of the following classes of terns is capitalized: ISUP indicators, ISUP parameters, ISUP messages. Examples: CC

30、NR Possible Indicator parameter, CCNR Possible indicator, Release message. Description General description The CCNR supplementary service enables user A, encountering a destination B which does not answer the call (No Reply), to have the call completed without having to make a new call attempt when

31、the destination becomes not busy after having initiated an activity. When user A encounters a destination B which does not answer the call (No Reply), user A can request the CCNR supplementary service. When user A requests the CCNR supplementary service, the network will monitor for destination B be

32、coming not busy after having initiated an activity. When destination B becomes not busy .e. access resources, e.g. at least one B-channel, are not busy) after having initiated an activity, then the network will wait a short time (as defined by the destination B idle guard timer) in order to allow th

33、e resources to be reused for originating a call. If the resources are not reused by destination B within this time, then the network will automatically recall user A. STD-ITU-T RECMN Qm733.5-ENGL 1797 B 48b2591 Ob71878 5T3 When user A accepts the CCNR recall, then the network will automatically gene

34、rate a CCNR call to destination B. 6.2 Specific terminology See clause 3, Definitions. 6.3 The CCNR supplementary service shall be applicable to all circuit mode bearer services defined in Recommendation 1.230 151, and all teleservices defined in Recommendation 1.240 161 with the following exception

35、s: a) b) Qualifications on the applicability to telecommunication services Call 2 of the videotelephony service (see Recommendation F.721) 171; All other circuit-switched telecommunications services requiring the use of more than one B-channel. 6.4 State definitions No specific state definitions are

36、 required. 7 Operational requirements 7.1 Provision/withdrawal The CCNR supplementary service may be provided to user A after prior arrangement with the service provider or may be generally available. The CCNR supplementary service shall be withdrawn by the service provider upon request of the subsc

37、riber or for service provider reasons. See also stage 1 description 12. 7.2 In order to operate the CCNR supplementary service, the originating local exchange shall have TC capabilities 8. The originating network shall have SCCP capability 7 for routing the TC operations. Requirements on the origina

38、ting network side 7.3 In order to operate the CCNR supplementary service, the destination local exchange shall have TC capabilities. The terminating network shall have SCCP capability for routing the TC operations. Requirements on the terminating network 7.4 The transit network shall have SCCP capab

39、ility for routing the TC operations. Requirements on the transit network 8 Coding requirements 8.1 Introduction This subclause describes the coding of information needed to support the CCNR supplementary service. The coding is specified for the following two protocols: b) ASE for CCNR. a ISUP 101; S

40、TD*ITU-T RECMN Q-733-5-ENGL 1999 4862591 Ob71879 43T .II 8.2 Coding requirements 8.2.1 ISUP protocol 8.2.1.1 For the CCNR call the PI in the Forward Call Indicators parameter in the IAM message shall be set to “ISDN User Part required all the way“. For some interaction cases, the service is possible

41、 without ISUF 1997 signalling capability. See clause 11. Signalling aspects impacting the routing 8.2.1.2 An indication about the possibility of invocation of CCNR in the destination local exchange is given in the CCNR Possible Indicator parameter in the ACM (subscriber fiee)/CPG (alerting). As the

42、first call is a basic call and as other signalling systems than “ISUP supporting CCNR“ may be used, the CCNR Possible Indicator parameter is not always conveyed. The format and the code of the CCNR Possible Indicator parameter is specified in Recommendation 4.763 1 O. CCNR Possible indicator in ACWC

43、PG 8.2.1.3 CCNR call indicator The CCNR call indicator is carried in the CCSS parmeter in the IAM. The format and the code of the CCSS parameter is specified in Recommendation 4.763 101. 8.2.2 ASE for CCNR 8.2.2.1 General All ASN. 1 symbols defined in the ASN. 1 module of the stage 3 description of

44、CCBS 131 except the CcbsRequest operation and the data types CalledPartyNumber, CallingPartyNumber are reused for CCNR purposes. 8.2.2.1.1 Subsystem number The subsystem number (SSN) value 0000 1011 has been allocated to the ISDN supplementary services ASES. 8.2.2.1.2 List of operations From origina

45、ting local exchange to destination local exchange: a) CCNR REQUEST (invoke) class 1 b) CCBS SUSPEND class 4 c) CCBS RESUME class 4 d) CCBS CANCEL class 4 From destination local exchange to originating local exchange: a) CCNR REQUEST (return result, error) class 1 b) REMOTE USER FREE class 4 cl CCBS

46、CANCEL class 4 8.2.2.1.3 List of parameter types Addressing and identification parameters: a) calling party number; b) called party number; UD-ITU-T REC“ Q.733.C-ENGL W 4b259L Ob7LB80 153 c) additional called number. NOTE 1 - If presentation of the calling party number is allowed, the country code s

47、hall be included in the calling party number in the originating local exchange, in case of an international outgoing call. Service management parameters: a) retain supported; b) cancel cause. Subscriber management parameters: a) user service information; b) c) access transport. NOTE 2 - The user ser

48、vice information prime parameter is used in the case of signalling procedures for connection type with fallback capability. user service infomation prime (see Note 2); 8.2.2.1.4 List of application errors a) short-tem denial; b) long-term denial. 8.2.3 Abstract syntax, general Subclause 8.3 specifie

49、s the abstract syntax for the CCNR ASE protocol using the Abstract Syntax Notation One (ASN.l) 6. The set of values each of which is a value of the ASN.l type “TCAPMessages.MessageType“ as defined in Recommendations 4.771-4.775 8 with the ANY DEFINED BY definitions resolved by the operations and errors definitions included in 8.3 form the abstract syntax for the CCNR ASE protocol. The encoding shall use the Basic Encoding Rules (see Recommendation X.690 191). The mapping of the OPERATION and ERROR MACROS to TC components is described in Recommen