1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.1902.3 (07/2001) SERIES Q: SWITCHING AND SIGNALLING Specifications of signalling related to Bearer Independent Call Control (BICC) Bearer independent call control protocol (Capability Set 2) and Signalling
2、System No. 7 ISDN user part: Formats and codes ITU-T Recommendation Q. 1902.3 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.1902.3 (07/2001) SERIES Q: SWITCHING AND SIGNALLING Specifications of signalling related to Bearer Independent Call Control (BIC
3、C) Bearer independent call control protocol (Capability Set 2) and Signalling System No. 7 ISDN user part: Formats and codes ITU-T Recommendation Q.1902.3 ITU-T Q-SEMES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q. 1-4.3 INTERNATIONAL AUTOMATIC AND SEMI-A
4、UTOMATIC WORKING 4.4-4.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN 4.604.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.1 Oo-Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 Q. 1204.249 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 4.2504.309 SPECIFICATIONS OF SIGNALLING SYS
5、TEM RI 4.3 104.399 SPECIFICATIONS OF SIGNALLING SYSTEM R2 4.4004.499 DIGITAL EXCHANGES Q.500-Q.599 INTERWORKING OF SIGNALLING SYSTEMS 4.6004.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 4.700-4.799 Q3 INTERFACE Q.SOO-Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.SSO-Q.999 PUBLIC LAND MOBILE NE
6、TWORK Q. 1 OOO-Q. 1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1 iOO-Q.1199 INTELLIGENT NETWORK Q.120O-Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.17OO-Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL Q.190-Q.1999 CONTROL (BICC) BROADBAND ISDN -Q.2004.2999
7、For further details, please refer to the list of ITU-TRecommendations. ITU-T Recommendation 4.1902.3 Bearer independent call control protocol (Capability Set 2) and Signalling System No. 7 ISDN user part: Formats and codes Summary This Recommendation specifies the formats and codes of the Bearer Ind
8、ependent Call Control (BICC) protocol for the support of narrow-band ISDN services independent of the bearer technology and signalling message transport technology used. It also specifies ISDN user part messages and parameters required to support basic bearer services and supplementary services acco
9、rding to ITU-T 4.76 1. Source ITU-T Recommendation Q.1902.3 was prepared by ITU-T Study Group 11 (2001-2004) and approved under the WTSA Resolution 1 procedure on 2 July 2001. The modifications indicated in Corrigendum 1 (04/02) have already been included in this Recommendation. ITU-T Rec. 4.1902.3
10、(07/2001) 1 FOREWORD The International Telecommunication Union (IT) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff que
11、stions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendatio
12、ns on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 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,
13、 the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a clai
14、med Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by IT members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had re
15、ceived 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. the mandatory fixed part;
16、d) the mandatory variable part; e a CIC; the optional part, which may contain fixed length and variable length parameter fields. I Message tme code I Mandatory fixed part Mandatory variable part Optional part Figure UQ.1902.3 - BICC message (BICC PDU) A description of the various parts is given in t
17、he following subclauses. 5.2 ISDN user part messages are carried on the signalling link by means of message signal units the format of which is described in 2.2/Q.703. The signalling information field of each message signal unit containing an ISDN user part message consists of the following parts (s
18、ee Figure 2): a routing label; b) CIC; c message type code; d) the mandatory fixed part; e the mandatory variable part; f) the optional part, which may contain fixed length and variable length parameter fields. NOTE 1 - The service information octet, the routing label and circuit identification code
19、 are not included in the SCCP user data parameter transferred between the ISDN user part and signalling connection control part. Format of ISDN user part messages I Mandaton, fixed art I I Mandatory variable part I Optional part Figure 2/Q.1902.3 - ISDN user part message ITU-T Rec. 4.1902.3 (07/2001
20、) 3 The format and codes used for the routing label are described in 2.2/Q.704. For each individual circuit connection, the same routing label must be used for each message that is transmitted for that connection. NOTE 2 - The SLS bits are set to the four least significant bits of the CIC. CIC CIC 5
21、.3 CIC 2 3 The format and meaning of the CIC field is different in two protocols covered by this Recommendation. Its length, structu Extension indicator (ext.): as 6.46 a) b) Application context identifier (AC0 (Octet I and Octet la) bl) If the extension bit is set to 1 in Octet 1, Octet la is absen
22、t. The value contained in 0000000 0000001 PSS1 ASE (VPN) 0000010 spare 000001 1 charging ASE The preceding values are used by APM98-user applications. 0000100 GAT ASE 0000101 BAT ASE 0000110 Enhanced Unidentified Context and Error Handling ASE 00001 11 Octet 1 Bits 1-7 shall be interpreted as follow
23、s: Unidentified Context and Error Handling (UCEH) ASE (EUCEH ASE) spare for international use 0111111 to 1000000 reserved for non-standardized APM98-user applications 1111111 14 ITU-T Rec. 4.1902.3 (07/2001) b2) If the extension bit is set to O in Octet 1, Octet la is present. In that case, the AC1
24、is a 14-bit field: Octet 1 a 7654321 0000001 0000001 0000010 to to 1111111 Octet 1 7654321 0000000 1111111 0000000 reserved for non-standardized APM2000-user applications spare for national use i 11 11 11 1 NOTE 1 - The compatibility mechanism as defined in ITU-T 4.764, in case of ISUP, and in ITU-T
25、 Q.1902.4, in case of BICC, is not applicable to this field. c) Application transport instruction indicators bit I Release call indicator (RCI) O do not release call 1 release call bit 2 Send notification indicator (SNI) O do not send notification 1 send notification d) APM segmentation indicator 00
26、0000 final segment 000001 indicates the number of following segments 001001 to i 001010 to spare 111111 NOTE 2 - The compatibility mechanism as defined in ITU-T 4.764, in case of ISUP, and in ITU-T 4.1902.4, in case of BICC, is not applicable to this field. e) Sequence indicator (SI) O 1 new sequenc
27、e 0 Segmentation local reference (SLR) g) APM-user information$eld subsequent segment to first segment The format and coding of this field depends on the Application Context Identifier. gl) If the AC1 corresponds to an APM98-user application, then the format of the APM-user information field is show
28、n in Figure 9. ITU-T Rec. Q.1902.3 (07/2001) 15 Encapsulated application information - - - - - Figure 9/Q.1902.3 - Content of the APM-user information field for APM98-user applications 4 4a 4n 5 5a 5n 6 The content of this field is described in g2.D). 82) If the AC1 corresponds to an APM2000-user ap
29、plication, then the format of the APM-user information field is shown in Figure 1 O: OE Nature of address indicator INN Ind. Numbering plan Ind. Spare 2nd address simal I 1 st address cimal Originating Address length 1 2 3 Originating Address Filler (if necessarv l nth address signal Destination Add
30、ress length m Destination Address I Encapsulated Application Information n Figure 10/Q.1902.3 - Content of the APM-user information field for APM2000-user applications The coding of the APM-user information field is as follows: g2.A) Originating address length g2.B) Destination address length g2.C)
31、Originating addressiDestination address The values are O, 3-20. The values are O, 3-20. The originating address (destination address) field is not present if the originating address length (destination address length) is set to zero. The format of the Originating and Destination address fields is sh
32、own in Figure 1 1. I- Figure 1 uQ.1902.3 - Content of the Originating address (Destination address) field 16 ITU-T Rec. 4.1902.3 (07/2001) The following codes are used in the Originating address and the Destination address fields: 1) 2) Nature of address indicator Oddeven indicator (O/E): as 6.17a)
33、0000000 spare 0000001 reserved for subscriber number 0000010 unknown (national use) 000001 1 national (significant) number 0000100 international number 0000101 network-specific number (national use) 0000110 network routing number in national (significant) number format (national use) network routing
34、 number in network specific number format (national use) reserved for network routing number concatenated with directory number 00001 11 0001000 0001001 to spare 1101111 1110000 reserved for national use 1111110 1111111 spare Internal network number indicator (INN ind.) O 1 3) routing to internal ne
35、twork number allowed routing to internal network number not allowed 4) Numbering plan indicator O00 spare O01 O10 spare 011 100 101 reserved for national use 110 reserved for national use 111 spare numbering plan according to ITU-T E. 164 reserved for numbering plan according to ITU-T X. 12 1 reserv
36、ed for numbering plan according to ITU-T F.69 5) Address signal O000 digit O O001 digit 1 O010 digit 2 ITU-T Rec. 4.1902.3 (07/2001) 17 O011 digit 3 0100 digit 4 0101 digit 5 0110 digit 6 o111 digit 7 1000 digit 8 1001 digit 9 1010 spare 1011 code 11 1100 code 12 1101 spare 1110 spare 1111 spare The
37、 most significant address signal is sent first. Subsequent address signals are sent in successive 4- bit fields. 6) Filler: as 6.17 f) g2.D) Encapsulated application information Contains the application specific information. The format and coding of this field is dependent upon the APM-user applicat
38、ion and defined in the appropriate Recommendation. For APM-user applications that wish to provide a service of transparent transport of information (e.g. the case where existing information elements are defined for the transport of certain information) as well as having the ability of passing additi
39、onal network related information within the public network, then the following guideline is provided: It is suggested that this field be structured such that the first octet (i.e. first octet of first segment for long APM-user information) is a pointer to information to be transported transparently.
40、 The pointer value (in binary) gives the number of octets between the pointer itself (included) and the first octet (not included) of transparent data. The pointer value all zeros is used to indicate that no transparent data is present. The range of octets between the pointer octet and the first oct
41、et of transparent data (to which the pointer octet points) contains the network related information to be passed between the applications residing within the public network. The format and coding of both the transparent information and the network related information is application specific and defi
42、ned in the appropriate Recommendation. 6.5 Automatic congestion level The format of the automatic congestion level parameter field is shown in Figure 12. 8 7 6 5 4 3 2 1 Automatic congestion level Figure 12/Q.1902.3 - Automatic congestion level parameter field 18 ITU-T Rec. 4.1902.3 (07/2001) The fo
43、llowing codes are used in the automatic congestion level parameter field: H G F E D C B Al P O N M L K J I 00000000 spare 00000001 congestion level 1 exceeded 00000010 congestion level. 2 exceeded 0000001 1 to 11111111 2 6.6 Backward call indicators The format of the backward call indicators paramet
44、er field is shown in Figure 13. II 7 l 5 4 3 2 1 Figure 13/Q.1902.3 - Backward call indicators parameter field The following codes are used in the backward call indicators parameter field: bits BA Charge indicator (Note 1) O O no indication O 1 no charge 1 O charge 11 spare NOTE 1 - The interpretati
45、on of these bits depends only on the charging exchange. bits DC Calledparty s status indicator O O no indication O 1 subscriber free 1 O 11 spare connect when free (national use) bits FE Calledpartys category indicator O O no indication O 1 ordinary subscriber 1 O Payphone 11 spare ITU-T Rec. 4.1902
46、.3 (072001) 19 bits HG O0 o1 10 10 bit I O 1 bit J O 1 bit K O 1 bit L O 1 bit M O 1 bit N O 1 bits p0 O0 o1 10 11 End-to-end method indicator (Note 2) no end-to-end method available (only link-by-link method available) pass-along method available (national use) (1SUP)reserved (BICC) SCCP method ava
47、ilable (ISUP)/reserved (BICC) pass-along and SCCP methods available (national use) (1SUP)lreserved (BICC) Interworking indicator (Note 2) no intenvorking encountered (Signalling System No. 7/BICC all the way) intenvorking encountered End-to-end information indicator (national use) (Note 2) no end-to
48、-end information available end-to-end information available (ISUP)/reserved (BICC) ISDN user part/BICC indicator (Note 2) ISDN user part/BICC not used all the way ISDN user part/I3ICC used all the way Holding indicator (national use) holding not requested holding requested ISDN access indicator term
49、inating access non-ISDN terminating access ISDN Echo control device indicator incoming echo control device not included incoming echo control device included SCCP method indicator (Note 2) no indication connectionless method available (national use) (ISUP)/reserved (BICC) connection oriented method available (ISUP)/reserved (BICC) connectionless and connection oriented methods available (national use) (ISUP)/reserved (BICC) NOTE 2 - Bits G-K and O-P constitute the protocol control indicator (ITU-T 4.730 and 4.1902.6). 20 ITU-T Rec. Q.1902.3 (07/2001)
