1、INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.767 APPLICATION OF THE ISDN USER PART OF CCITT SIGNALLING SYSTEM No. 7 FOR INTERNATIONAL ISDN INTERCONNECTIONS Recommendation Q.767 T Geneva, 1991
2、INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.767 APPLICATION OF THE ISDN USER PART OF CCITT SIGNALLING SYSTEM No. 7 FOR INTERNATIONAL ISDN INTERCONNECTIONS Recommendation Q.767 Geneva, 1991 FO
3、REWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing te
4、lecommunications on a worldwide basis. The Plenary Assembly of CCIIIT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between Plenary Assemblies is covered by the procedu
5、re laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation 4.767 was prepared by Study Group XI and was approved under the Resolution No. 2 procedure on the 15th of February 1991. _” ” CCIIIT NOTE In this Recommendation, the expression “Administration” is used for conciseness to indica
6、te both a telecommunication Administration and a recognized private operating agency. O ITU 1991 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
7、rom the ITU. used for conciseness to indicate both a Recommendation Q.767 1 APPLICATION OF THE ISDN USER PART OF CCITT SIGNALLING SYSTEM No. 7 FOR INTERNATIONAL ISDN INTERCONNECTIONS 1 Introduction ISDN international interconnections have to be realized between non homogeneous ISDNs that differ in t
8、erms of services supported, national network signalling system and national access protocol. In order to perform such international ISDN interconnections, it is required to specify unambiguously and without options: - the service capabilities of the international signalling system; - the internation
9、al signalling interface, i.e., the signalling information elements and messages sent and received on the international signalling section and the related procedures; - all additional information, which is not specifically signalling system related, but which is needed to absorb the potential differe
10、nces between the national networks. Section 2 of this Recommendation describes the list of services supported by the ISUP intemational interface. Section 3 contains the definition of the international ISUP signalling specification, in terms of exceptions/clarifications to the existing Blue Book ISUP
11、 text. Section 4 contains additional information to ease international ISDN interconnections. This “Guidelines” section should be understood as a “users guide” for international ISDN interconnection. One of the objectives is to highlight possible areas of difficulty and propose standard solutions, t
12、hat should be applied as far as possible by international operators. The Annexes A to E contain the complete revised Blue Book text. Sections 1 to 4 have precedence over the content of Annexes A to E. Blue Book SDLs have not been revised and are therefore not applicable to Recommendation Q.767. Reco
13、mmendation Q.767 1 2 Services supported The following services are supported by the first version of the ISUP international interface, specified-in Recommendation 4.767. The services supported by the international interface have not to be fully supported in a national network. The relevant CCIIT Rec
14、ommendations are indicated per service, with the possible modifcations/simplifications applied for international operation of the service. 2.1 Bearer services The following bearer services are supported by the international interface: - 64 kbits/s unrestricted (Recommendation 1.23 l. 1); - Smh (Reco
15、mmendation 1,231.2); - 3.1 kHz audio (Recommendation 1.231.3). Semi permanent switched connections are considered as non ISUP controlled, and are, therefore, outside the scope of this document. 2.2 Teleservices The following teleservices are supported - Telephony (Recommendation 1.24 1.1); - Teletex
16、 (Recommendation 1.241.2); - Telefax Gr 4 (Recommendation 1.24 1.3); - Mixed mode (Recommendation 1.241.4); - Videotex (Recommendation 1.241.5); - Telefax Gr 2/3. 2.3 Supplementary services The following supplementary services are supported - CLIP/CLIR as described in Recommendation 1.25 1.3/4; - CO
17、LP/COLR as described in Recommendation 1.25 1.5/6; - CUG as described in Recommendation 1.255.1; - UUS 1 implicit as described in Recommendation 1.257.1. 2 Recommendation Q.767 - - - - - . - Direct Dialling In and Multiple Subscriber Number are without significance to the international interface. Su
18、baddressing and terminal portability are implicitly supported, as part of the basic 4.767 procedures. 2.4 Interworking between ISDN and PSTNIIDN Interworking between ISDN and PSTN/IDN is supported for the following services: - telephony; - voice band data; - digital connectivity. 3 Exceptions and cl
19、arification to the Blue Book ISUP Recommendations 3.1 General The objective of this section is to specify the exceptions to CCIIT Recommendations: - 4.761 (Functional description of the ISDN User Part of CCITT Signalling System No, 7); - 4.762 (General functions of CCITT Signalling System No. 7 ISDN
20、 User Part Messages and parameters); - 4.763 (Formats and codes of CCIIT Signalling System No. 7 ISDN User Part Messages and parameters); - 4.764 (Signalling procedures for CCIIT Signalling System No. 7 ISDN User Part); - 4.730 (ISDN supplementary services), with deletions, clarifications etc., for
21、international application. The following information is presented as an exceptions document which should be read in conjunction with Recommendations Q.761 to 4.764 and 4.730. Annexes A to E . contain the complete revised text. Those parts of the CCITT Recommendation which have not been listed as exc
22、eptions and are not relevant to international interconnection should only be used as additional information to aid understanding. Although this Recommendation applies only to the international signalling section, the specification of funcfions, formats and codes of messages and signals, and actions
23、performed at originating and destination local exchanges is retained. Recommendation Q.767 3 Q.761 Section 1 2 3.2.4 4 An international gateway mainly performs functions like a normal transit exchange in all cases where the national ISDN User Part implementation is the same as the implementation of
24、the ISDN User Part for the international signalling section. In the case where a national signalling system behaves differently, the internationd gateway exchange has to support both the concerned national and the international network and the services and equipments supported by both the concernedn
25、ational and the international network. 3.2 Exceptions and clarifications to Recornmendation Q.761 Table UQ.767 contains three columns as follows: - the first column marked “Section” identifies the relevant section of Recommendation Q.761; - the second column marked “Title” identifies the relevant su
26、bject of Recommendation Q.761; - the third column marked “Remarks” identifies the deviations from Recommendation 4.761 as appropriate for the international signalling section. No remark is made against national options. It is assumed that they will not occur on an international All subsections are t
27、he same as in Recommendation 4.761 unless indicated otherwise in Table UQ.767 Title TABLE 1/Q.767 Remarks General Services supported by the ISDN User Part Status End-to-end signalling 4th paragraph SCCP is not used The list of services and supplementary services is contained in Rec. Q.767, 2. a) Del
28、ete in the 1st paragraph, 1st sentence: “or the ISDN User part at the destination is unavailable” b) The note to Table UQ.761 reads: “The cause parameter can assume one value: -signalling network congested.“ Not applicable Recommendation Q.767 3.3 Exceptions and clarifications to Recommendation 12.7
29、62 Table 2/Q.767 contains three columns as follows: - the first column marked “Section” identifies the relevant section of 4.762; - the second column marked “Title” identifies the relevant subject of 4.762; - the third column marked “Remarks” identifies the deviations from 4.762 as appropriate for t
30、he international signalling section. All subsections are the same as in Recommendation 4.762 unless indicated otherwise in Table 2/Q.767 below. The remark “Not used” in the table means that a message, parameter or indicator should not be generated at an outgoing or incoming gateway exchange towards
31、the intemational signalling network and if such a message, parameter or indicator is received by an international exchange the procedures defined in Recommendation 4.764, Q 2.10.5 in combination with the remarks listed in the Q 3.5 of Recommendation 4.767 against 2.10.5 of Recommendation 4.764 are i
32、nvoked. The remark “Default value is used” in the table means that an indicator is seen on the international interface, but only one value is allowed to be sent. The remark “Default coding is used“ in the table means that a parameter is seen on the international interface, but only one coding is all
33、owed to be sent. No remark is made against messages and parameters marked “For national use”. It is assumed that they will not appear on an international relation. Paragraph 3.3.1 contains definitions for additional messages, parameters and indicators. Recommendation Q.767 5 TABLE 214.767 (sheet 1 o
34、f 4) Q.762 Title Remarks section 1.5 Call modification completed message (CMC) Not used 1.6 Call modification reject message (CMRJ) Not used 1.7 Call modification request message (CMR) Not used 1.16 Circuit group query message (CQM) Not used 1.17 Circuit group query response message (CQR) Not used 1
35、.18 Confusion message (CFN) Not used 1.23 Facility accepted message (FAA) Not used 1.24 Facility rejected message (FRJ) Not used 1.25 Facility request message (FAR) Not used 1.27 Information message (INF) Not used . 1.28 Information request message (INR) Not used 1.32 Pass-along message (PAM) Not us
36、ed I 1.33 Release message (ML) Delete last sentence “In case the call .“ 1.42 User to user information message (USR) Not used 2.2 Address presentation restricted indicator Last sentence changed It is also used to indicate the non-availability of the address 2.5 Call forwardmg may occur indicator Def
37、ault value is used I 2.6 I Call identity Not used 2.7 Call reference Not used 6 Recommendation Q.767 4.762 section 2.12 2.13 2.14 2.16 2.17 2.18 item a) item b) item c) item d) item e) item f) 2.24 2.27 2.29 2.32 2.33 2.35 2.36 2.38 TABLE 214.767 (sheet 2 of 4) Title Calling party address request in
38、dicator Calling party address response indicator Calling party number incomplete indicator Calling partys category request indicator Calling partys category response indicator Cause value Normal class Resource unavailable class Service or option not available class Service or option not implemented
39、class Invalid message (e.g. Parameter out of range) class Protocol error (e.g. unknown message) class Circuit state indicator Coding standard Connection request Credit Diagnostic End-to-end information indicator End-to-end method indicator Event presentation restriction indicator Remarks Not used No
40、t used Default value is used Not used Not used Cause 2 not used Cause 22: delete 2nd and 3rd sentences Additional definition for cause 44 (see J 3.3.1 of Rec. 4.767) Cause 50 not used Causes 69 and 70 not used. Cause 87 redefined (see J 3.3.1 of Rec. 4.767); cause 91 not used Cause 102 is added (see
41、 5 3.3.1 of Rec. 4.767); Causes 97,99,103 not used. Not used Default value is used Not used Not used Not used Default value is used Default value is used Default value is used Recommendation Q.767 7 TABLE 214,767 (sheet 3 of 4) 4.762 section Title Remarks 2.40 Facility indicator Not used 2.49 I Loca
42、l reference Not used Modification indicator Numbering plan indicator Not used Default value is used Not used 2.58 I Original redirection reason Not used 2.59 Point code 2.60 Protocol class Not used Not used Whether a bit or a bit combination contained in the PC1 has history or control characteristic
43、 is specified in the definitions of the individual bits or bit combinations. 2.61 Protocol control indicator 2.63 Recommendation indicator 2.64 Redirecting indicator Not used Not used 2.65 I Redirecting number Not used Not used 2.66 I Redirecting reason 2.67 I Redirecting counter Not used Not used D
44、efault value is used 2.68 Redirection number 2.7 1 SCCP method indicator 2.74 Solicited information indicator 2.8 1 User to user indicators Not used Default value is used 2.AA I Connected line identity request indicator See 3.3.1 of Rec. 4.767 See 0 3.3.1 of Rec. 4.767 2.BB Network discard indicator
45、 8 Recommendation Q.767 4.7 62 section Table 1/Q.762 TABLE 2/Q.767 (sheet 4 of 4) Title Remarks Table 1/Q.762 is replaced by the following Table 3/Q.767. The following remarks apply: - Messages and parameters not used are not included. - Subfields included in used parameters and optional parameters
46、included in used messages that are marked as “default value is used“ are marked with bold type characters. - Subfields included in used parameters and optional parameters included in used messages that are marked as “default coding is used“ are marked with underlined bold type characters. Recommenda
47、tion Q.767 9 O O O E E E B a .S 10 Recommendation Q.767 CCITT RECMN*Q-767 71 i- O R S O a a .B Recommendation Q.767 11 CCITT RECMN*Q-767 73 4862573 05b2556 T 9 + “c O O O -3 26 b 8 12 Recommendation Q.767 E E - I 2 ka 2 32 PP a t-“ O O F 8 gg S vl U S z O P 2 Recommendation Q.767 13 CCITT RECMN*Q=76
48、7 41 m 4862593 0562558 3 m 14 Recommendation Q.767 3.3.1 Additional definitions 3.3.1.1 connected line identity request indicator Information sent in the forward direction indicating a request for the connected party number to be returned. 3.3.1.2 network discard indicator This indicator indicates t
49、hat user to user information included in the call control message has been discarded by the network. 3.3.1.3 cause 44 “Requested circuit/channel not available” This cause is returned when the circuit or channel indicated by the requesting entity cannot be provided by the other side of the interface. 3.3.1.4 cause S7 “Called user not member of CUG” This cause indicates that the called user for the incoming CUG call is not member of the specified CUG or that the calling user is an ordinary subscriber calling a CUG subscriber, respectively.
