1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMM U N CATION STANDARDIZATION SECTOR OF ITU Q.1912.2 (071200 I ) SERIES Q: SWITCHING AND SIGNALLING Specifications of signalling related to Bearer Independent Call Control (BICC) Interworking between selected signalling systems (PSTN access, DSSI, C5
2、, RI, R2, TUP) and the Bearer Independent Call Control protocol ITU-T Recommendation Q. 191 2.2 (Formerly CCITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATIO
3、NS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 43 INTERFACE DIGITAL SUBSCRIBER SIGNALLING S
4、YSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q. 1-4.3 4.4-4.59 4.60-4.99 Q.lOO-Q.119 Q.12O-Q.249 4.250-4.309 4.310-4.399 4.400-4.499 Q.500-4.599 4.
5、600-4.699 4.700-4.799 Q.SOO-Q.849 Q.850-Q.999 Q.1000-Q.1099 Q.110O-Q.1199 Q. 1200-Q. 1699 II SIGNALLING REOUIREMENTS AND PROTOCOLS FOR IMT-2000 Q. 170O-Q. 1799 BROADBAND ISDN Q.2000-Q.2999 ForfUrther details, please refer to the list of ITU-T Recommendationr. ITU-T Recommendation Q.1912.2 Interworki
6、ng between selected signalling systems (PSTN access, DSS1, C5, R1, R2, TUP) and the Bearer Independent Call Control protocol Summary This Recommendation defines the signalling interworking between the Bearer Independent Call Control (BICC) protocol and selected signalling systems (PSTN access, DSS1,
7、 C5, RI, R2 and TUP) for which the interworking is defined with the ISDN User Pari (ISUP) protocol of Signalling SystemNo. 7. Source ITU-T Recommendation 4.1912.2 was prepared by ITU-T Study Group 11 (2001-2004) and approved under the WTSA Resolution 1 procedure on 2 July 2001. ITU-T 4.1912.2 (07/20
8、01) 1 FOREWORD The International Telecommunication Union Tu) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector FU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions an
9、d issuing Recommendations on them with a view to standarhg 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 Recommendations on these t
10、opics. 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, the expressi
11、on “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 claimed Intellect
12、ual Property Right. 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 Recommendation development process. As of the date of approval of this Recommendation, ITU had not received n
13、otice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, impiementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. o ITU 2002 All rights reserved. No
14、 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 ITU. 11 ITU-T 4.1912.2 (07/2001) CONTENTS I 2 3 4 5 6 6.1 6.2 6.3 7 7.1 7.2 7.3 7.4 7.5 Scope . References . De fini
15、ions Abbreviations General considerations Interworking with access signalling systems PSTN access signalling system . ISDN access signalling system DSS1 . Multiplexed access signalling systems . Interworking with network signalling systems . General 7.1.1 Interworking specifications . 7.1.2 Return o
16、f address complete message in interworking situations . Interworking with network signalling system C5 . Interworking with network signalling system R1 . Interworking with network signalling system R2 . Interworking with network signalling system TUP ITU-T Q.1912.2 (07/2001) Page 1 2 3 3 3 . lll ITU
17、-T Recommendation 4.1912.2 Interworking between selected signalling systems (PSTN access, DSSl, C5, R1, R2, TUP) and the Bearer Independent Call Control protocol 1 Scope This Recommendation defines the signalling intenvorking between the Bearer Independent Call Control (BICC) protocol and narrow-ban
18、d signalling systems for which the interworking is defined with the ISDN User Part (ISUP) protocol of Signalling System No. 7. BICC is the protocol defmed in ITU-T 4.1902.1 to 4.1902.4 23. ISUP is the protocol defined in This Recommendation builds upon: - ITU-T 4.761 to 4.764 21. The signalling inte
19、rworking between selected signalling systems (PSTN access, DSS1, C5, R1, R2 and TUP) and the ISDN User Part (ISUP) protocol of Signalling System No. 7 as defined in various ITU-T Recommendations. The signalling intenvorking between the Bearer Independent Call Control (BICC) protocol and the ISDN Use
20、r Part (ISUP) protocol of Signalling System No. 7 as defined in ITU-T 4.1912.1 24. The intenvorking between the selected signalling systems for which the interworking is defined with ISUP and BICC takes place via ISUP. The scope of this Recommendation is thus as shown in Figure 1. - Scope of existin
21、g interworking Recommendation Scope of this Recommendation Scopeof IT-T Q.1912.1 BICC network using separate network cd and bearer signalling Ti 11 1191-l SCN I Figure UQ.1912.2 - Scope of this Recommendation ITU-T 4.1912.2 (07/2001) 1 2 References The following ITU-T Recommendations and other refer
22、ences contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revisions; users of this Recommendation are therefore encouraged to inv
23、estigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T G.964 (1994), V-Interfaces at the digital local exchange (LE) - V5.1 -interface (based on 2048 kbit
24、/s) for the support of access network (AN). ITU-T G.965 (2001), V-Interfaces at the digital local exchange (LE) - V5.2 Interface (based on 2048 kbit/s) for the support of access network (AN). ITU-T G.995.1 (2001), Overview of digital subscriber line (DSL) Recommendations. ITU-T 4. 1 18 (1997), Abnor
25、mal conditions - Special release arrangements. ITU-T 4. 140 to 4. 164 (1 988), Specijcations of Signalling System No. 5. ITU-T 4.3 10 to 4.332 (1988), SpeciJcations of Signalling System RI. ITU-T 4.400 to 4.490 (1 988), Specijkations of Signalling System R2. ITU-T 4.543 (1 993), Digital exchange per
26、formance design objectives. ITU-T 4.6 17 (1 993), Logic procedures for incoming Signalling System No. 7 (ISUP). ITU-T 4.627 (1993), Logic procedures for outgoing Signalling System No. 7 (ISUP). ITU-T 4.646 (1993), Logic procedures for interworking of Signalling System No. 5 to Signalling System No.
27、7 (ISUP). ITU-T 4.667 (1993), Logic procedures for interworking of Signalling System No. 7 (TUP) to Signalling System No. 7 (ISUP). ITU-T 4.675 (1 993), Logic procedures for interworking of Signalling System RI to No. 7 ITU-T 4.686 (1993), Logic procedures for interworking of Signalling System R2 to
28、 Signalling System No. 7 (ISUP). ITU-T 4.690 (1993), Logic procedures for interworking of Signalling System No. 7 (ISUP) to No. 5. ITU-T 4.692 (1993), Logic procedures for interworking of Signalling System No. 7 (ISUP) to No. 7 (TUP). ITU-T 4.694 (1993), Logic procedures for interworking of Signalli
29、ng System No. 7 (ISUP) to RI. ITU-T 4.695 (1993), Logic procedures for interworking of Signalling System No. 7 (ISUP) to R2. ITU-T 4.699 (1997), Interworking between ISDN access and Non-ISDN access over ISDN user part of Signalling System No. 7. ITU-T 4.721 to 4.725 (1988), Specijcations of the Sign
30、alling System No. 7 - Telephone user part (TUP). ITU-T 4.76 1 to 4.764 (1 999), SpeciJications of Signalling System No. 7 - ISDN user part. ITU-T 4.931 (1998), ISDN user-network interface layer 3 specijkation for basic call control. (ISUP). ITU-T 4.1912.2 (07/2001) 23 24 ITU-T Q. 1902.1 to Q. 1902.4
31、 (200 i), SpeciJications of the Bearer Independent Call Control protocol (BICC). ITU-T 4.1912.1 (2001), Interworking between Signalling System No. 7 ISDN user part (ISUP) and the Bearer Independent Call Control protocol. 3 Definitions For BICC specific terminology, the reader is referred to ITU-T Q.
32、 1902.1 23. ACM BCF-N BICC BIWF c5 CSF-N DSL DSS 1 ISDN ISN ISUP PSTN R1 R2 SCN SDL TMR TUP v5 4 Abbreviations This Recommendation uses the following abbreviations: Address Complete Message Bearer Control Nodal Function Bearer Independent Call Control Bearer Interworking Function Signalling System N
33、o. 5 Call Service Nodal Function Digital Subscriber Line Digital Subscriber Signalling System No. 1 Integrated Services Digital Network Interface Serving Node ISDN User Part Public Switched Telephone Network Signalling System R1 Signalling System R2 Switched Circuit Network Specification and Descrip
34、tion Language Transmission Medium Requirement Telephone User Part Family of V-interfaces for connection of ANS to the LE, e.g. V5.1 and V5.2 5 General considerations This Recommendation specifies interworking principles between BICC and signalling systems for which the interworking is defined with I
35、SUP. This refers to the signalling systems that are available in the SCN at the access or within the networks. This interworking takes place at the ISN. Figure 2 shows the signalling systems covered. ITU-T 4.1912.2 (07/2001) 3 Half call Half call 4 *? 4 b +-+ i CSF-N I i - Q.646and 4.690 c5 .cl I 4.
36、675 and 4.695 4.692 3 T111119x)-01 Figure 21Q.1912.2 - Coverage of signalling interworking cases 6 Interworking with access signalling systems 6.1 PSTN access signalling system PSTN access signalling systems are implemented based on national regulations or operator specifications. The interworking b
37、etween a specific PSTN access signalling protocol and BICC shall act according to the interworking between the PSTN access signalling protocol and ISUP with the guidance provided in ITU-T 4.699 i91 and the additional interworking considerations in ISUP 21, concatenated with the interworking between
38、ISUP and BICC in IT-T Q. 1912.1 24. The details of the PSTN access signalling protocols are outside the scope of the IT-T Recommendations. If an incoming BICC call indicates the TMR value 64 kbitls preferred, the procedures for fallback (6.3.1.3.1.2Q.1912.1 24) shall be initiated because the PSTN ac
39、cess signalling system does not support this TMR value. 4 ITU-T Q.1912.2 (07/2001) 6.2 The ISDN access signalling DSSl is specified in ITU-T 4.931 22. The intenvorking between DSSl and BICC shall act according to the interworking between ISUP and DSSl in IT-T 4.699 191 and the additional interworkin
40、g considerations in ISUP 21, concatenated with the intenvorking between ISUP and BICC in IT-T 4.1912.1 24. ISDN access signalling system DSS1 6.3 Multiplexed access signalling systems The same interworking considerations as in 6.2 apply when the signalling of multiple access lines is multiplexed (e.
41、g. over a V5 transmission system as defined in ITU-T G.964 i and G.965 2 or an DSL type of transmission system as defined in G.995.1 3). In these situations, the non-ISDN access signalling system or the ISDN access signalling system is extracted by the transmission system. From a signalling perspect
42、ive the access line is terminated as indicated in Figure 2 for a single access line. 7 Interworking with network signalling systems 7.1 General 7.1.1 Interworking specifications 4.692 16, 4.694 17 and 4.695 18 provide interworking specifications for ISUP using Specification and Description Language
43、(SDL) diagrams. ITU-T 4.617 9, 4.627 lo, 4.646 il, 4.667 12, 4.675 13, 4.686 14, 4.690 15, 7.1.2 An address complete message will not be sent until the cross-office check is made, if applicable (see ITU-T 4.543 SI). If the succeeding network does not provide electrical called-partys-line- condition
44、indications the CSF at the ISN shall originate and send an address complete message when the end of address signalling has been determined: a) b) 4 d) e) Return of address complete message in interworking situations by receipt of an end-of-pulsing (ST) signal; or by receipt of the maximum number of
45、digits used in the national numbering plan; or by analysis of the national (signifcant) number to indicate that a sufficient number of digits has been received to route the call to the called party; or by receipt of an end-of-selection signal from the succeeding network (e.g. number received signal
46、in Signalling System No. 5); or exceptionally, if the succeeding network uses overlap signalling and number analysis is not possible, by observing that timer (timer T10 in ITU-T 4.764 21) has elapsed since the last digit was received, and that no fiesh information has been received; in such circumst
47、ances, transmission to the national network of the last digit received must be prevented until the end of the waiting period which causes an address complete message to be sent backward. In this way, it is ensured that no national answer signal can arrive before an address complete message has been
48、sent. If in normal operation, a delay in the receipt of an address complete signal from the succeeding network is expected, the CSF at the ISN will originate and send an address complete message 15 to 20 seconds (timer T11 in ITU-T 4.764 21) after receiving the latest address message. The time-out c
49、ondition is an upper limit considering the subclauses of 2.9.8.3/Q.764 21 (20 to 30 seconds waiting for address complete message timer (T7). ITU-T 4.1912.2 (07/2001) 5 When timer T11 expires, an ACM is sent to the preceding CSF. CSFs that run timer T11 do not run timer T7. In addition, the wait for answer timer (4.3.UQ.118 4) shall be started at the sending of ACM. 7.2 The network signalling system C5 is defined in ITU-T 4.140 to 4.164 5. The interworking between C5 and BICC shall act according to the interworki
