1、- ITU-T RECMN*Q*b98 93 4862591 0591718 095 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU INTERWORKING OF SIGNALLING SYSTEMS Q.698 (03/93) INTERWORKING OF SIGNALLING SYSTEM No. 7 ISUP, TUP AND SIGNALLING SYSTEM No. 6 USING ARROW DIAGRAMS ITU-T Recommendat
2、ion Q.698 (Previously “CCITT Recommendation”) FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecom- munication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them wit
3、h a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. ITU-T Recommendati
4、on Q.698 was prepared by the ITU-T Study Group XI (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES I As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its place, the ITU Teleco
5、mmunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no change has been made in the text to references contain
6、ing the acronyms ?CCITT, CCIR or IFRB? or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 telecommunication administration and a recognized operating agency. In this R
7、ecommendation, the expression ?Administration? is used for conciseness to indicate both a O ITU 1994 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 writi
8、ng from the ITU. ITU-T RECMN*Q.bSB 93 m 48b2591 0591720 743 m CONTENTS 1 General . 1 .I Introduction 1.2 Scope i .3 Relationship to other Recommendations . 2 Methodology 3 Interworking arrow diagrams for successful call set-up 3.1 Signalling System No. 6 to Signalling System No. 7 ISUP 3.2 ISUP to S
9、ignalling System No. 6 3.3 Signalling System No. 7 TUP to ISUP . 3.4 Signalling System No. 7 ISUP to TUP . Signalling System No. 6 to ISUP ISUP to Signalling System No. 6 4 Interworking arrow diagrams for unsuccessful call set-up . 4.1 4.2 4.3 Signalling System No. 7 TUP to ISUP . . 4.4 Signalling S
10、ystem No. 7 ISUP to TUP . . Recommendation Q.698 (03/93) Page 1 1 1 1 1 1 1 2 2 3 10 10 11 12 13 ITU-T RECMN*Q.b98 93 4862593 059372L b8T Recommendation Q.698 INTERWORKING OF SIGNALLING SYSTEM No. 7 ISUP, TUP AND SIGNALLING SYSTEM No. 6 USING ARROW DIAGRAMS (Helsinki, 1993) 1 General 1.1 Introductio
11、n This Recommendation defines the use of arrow diagrams to provide a comprehensive view of the signalling handshake between ISDN-UP and other common channel signalling systems. The use of primitives as defined in Recommendation Q.699 is also included to gain a further level of understanding in an in
12、terworking situation. Detailed signalling interworking information still has to refer to the signalling procedures defined in respective Recommendations. 1.2 Scope This Recommendation provides arrow diagrams for basic calls in which ISDN-UP interworks with other common channel signalling systems. Na
13、tional options are not covered whereas supplementary services are for further study. Typical selective interworking cases are dealt with and references are made to relevant Recommendations. Mapping tables are used to cover interworking situations where there is no one to one correspondence between s
14、ignals of different common channel signalling systems. 1.3 Relationship to other Recommendations References to other Recommendations are made to clarify the procedures in a number of interworking cases. The following Recommendations are referred to in this Recommendation: Q. 1 18, Q.254-Q.268, Q.699
15、, Q.722-Q.725, Q.762-Q.764. 2 Methodology The interworking model used in this Recommendation is essentially the same as defined in 2.2/Q.699. The use of primitives is also consistent with that interworking model. The symbols used in this Recommendation are described in Table 1. 3 Interworking arrow
16、diagrams for successful call Set-up 3.1 Signalling System No. 6 to Signalling System No. 7 ISUP 3.1.1 Normal call with calling party disconnect Figure 1 shows normal call Set-up. When the calling party sends a CLF, the call is cleared. An REL message (Cause 16) is sent to the succeeding exchange ind
17、icating normal clearing. 3.1.2 Normal call with called party disconnect Figure 2 shows normal call Set-up. When the called party hangs up, a CLB1 signal is sent to the preceding exchange indicating normal call clearing. Recommendation Q.698 (03/93) 1 O X - I I ITU-T RECMN*d.b98 93 m 4862593 0593722
18、536 m TABLE UQ.698 Symbols used Reservation of an incomingbutgoing circuit without through connection Disconnection of path through the exchange Through connection of path in both directions Release of circuit Indicates I/C and O/G primitives are unconditionally related Continuity check tranxeiver L
19、oop for continuitycheck Continuity check required in nature of connection indicators Network initiated in suspend/resurne indicators T114166092/60 3.2 ISUP to Signalling System No. 6 3.2.1 Normal call with calling party disconnect Figure 3 shows normal call Set-up. When an REL message (Cause 16) is
20、received from the preceding exchange, a CLF signal is sent to the succeeding exchange to indicate normal call clearing. 3.2.2 Normal call with called party disconnect Figure 4 shows normal call Set-up. When the called party hangs up, a CLB1 signal is received from the succeeding exchange. An SUS mes
21、sage is then sent to the preceding exchange to indicate normal call clearing. 3.3 Signalling System No. 7 TUP to ISUP 3.3.1 Normal call with calling party disconnect Figure 5 shows normal call Set-up. When the calling party sends a CLF, the call is cleared. An REL message (Cause 16) is sent to the s
22、ucceeding exchange indicating normal clearing. 3.3.2 Normal call with called party disconnect Figure 6 shows normal call Set-up. When the called party hangs up, a CLB signal is sent to the preceding exchange indicating normal call clearing. 2 Recommendation Q.698 (03/93) ITU-T RECMN*Q=b98 93 4862593
23、 0593723 452 W 3.4 Signalling System No. 7 ISUP to TUP 3.4.1 Normal call with calling party disconnect Figure 7 shows normal call Set-up. When the calling party sends a Release Message (REL), the call is cleared. A CLF message is sent to the succeeding exchange indicating normal clearing, 3.4.2 Norm
24、al call with called party disconnect Figure 8 shows normal call Set-up. When the called party hangs up, an SUS signai is sent to the preceding exchange indicating normal call clearing. P recei ing exchange Outgoing SS No. 6 IAM I ncornin g SS No. 6 T Interwork ng exchange control -E I I Outgoing 7 S
25、ucceeding exch ange Incoming Setup Ti 14167C-921dO2 NOTE - Cause 16 = Normal clearing. FIGURE 1/Q.698 Normal call with calling party disconnect SS NO. 6 to ISDN-UP Recommendation Q.698 (03/93) 3 Preceding exchange Interworking exchange Outgoing SS No. 6 I 4 Incoming 1 SS No. 6 7- Setup 11.111 ; 1111
26、111 4 CCH Tone 4 Call control O E e $) t Outgoing 7 Succeeding exchange Incoming ISU P Setup I- I- Ti 141680-92/d3 NOTE - Cause 16 = Normal clearing. FIGURE 2/Q.698 Normal call with called party disconnect SS NO. 6 to ISDN-UP Recommendation Q.698 (03/93) Preceding exchange Outgoing El ITU-T RECMNUQ.
27、bS8 93 D 4862593 0593725 225 H Incoming IAM (Ci) + I ACM II t- Cause 16 I- I nterworking exchange contrd I Call I Outgoing SS No. 6 Succeeding exchange Incming SS No. 6 NOTE - Cause 16 = Normal clearing. FIGURE 3lQ.698 Normal call with calling party disconnect ISDN-UP to SS NO. 6 Recommendation Q.69
28、8 (03193) 5 ITU-T RECMN*Q.b98 93 48b259Z 059372b ZbL Preceding Interworking exchange eEhange Outgoing iJ Incoming I control L +o IAM (Ci) Setup L - I nd CC H Tone : 1111111111111111 COT Ind I L Outgoing r SS No. 6 I Succeeding exchange Incoming SS No. 6 I IAM 1 CCH Tone COT I ADC I ANC CLBl a CLF D
29、RLG 1 Ti1 41700-92/d05 NOTE - Cause 16 = Normal clearing by calling party before T6 expires 2.5.1.3 c)/Q.767. FIGURE 4/Q.698 Normal call with called party disconnect ISDN-UP to SS NO. 6 I 6 Recommendation Q.698 (03/93) Preceding exchange Outgoing SS No. 7 TUP _. Incoming SS No. 7 Interworking exchan
30、ge control Outgoing SS No. 7 Succeeding exchange Incoming SS No. 7 I NOTE - Cause 16 = Normal clearing. FIGURE YQ.698 SS No. 7 TUP to ISUP Normal call with calling party disconnect Recommendation Q.698 (03/93) 7 Precedng exchange Outgoing i, SS No. 7 I 8 ITU-T RECMM*Q-b98 93 m 4862591 0591728 T34 m
31、Incoming SS No. 7 TUP I Interworking exchange control jE COT ANC I CLB I CLF I RLG I I Setup Outgoing SS No. 7 I IAM (Ci) Succeeding exchange 1 Incoming SS No. 7 ISUP m T1141720-92WO7 NOTE - Cause i 6 = Normal clearing. FIGURE 6fQ.698 SS No. 7 TUP to ISUP Normal call with called party disconnect Rec
32、ommendation Q.698 (03/93) Prececing exchange Outgoing I Incoming Fl Interworking exchange Call control O 6 i (8 I I Outgoing SS No. 7 setup IAM Succeeding exchange Incoming SS No. 7 I NOTE - Cause I6 = Normal clearing. FIGURE 7lQ.698 Inferworking of Signalling System No. 7 ISUP to No. 7 TUP Normal c
33、all with calling party disconnect Recommendation Q.698 (03/93) 9 Preceding Outgoing I ITU-T RECMN*Q.b98 93 4862591 0591730 692 Succeeding Interworking Incoming ISUP control i *A+ - Resp Setup I I Outgoing SS No. 7 Tr 1 exchan e Incoming SS No. 7 CCH Tone NOTE - Cause 16 = Normal clearing by called p
34、arty before T6 expires (2.5.1.3. c)/Q.767. FIGURE WQ.698 Interworking of Signalling System No. 7 ISUP to No. 7 TUP Normal call with calling party disconnect 4 Interworking arrow diagrams for unsuccessful call Set-up 4.1 Signalling System No. 6 to ISUP 4.1.1 Continuity failure on an incoming No. 6 ci
35、rcuit Figure 9 shows the check-tone not being looped within its timeout period of two seconds. A BLO signal is issued by the preceding exchange. After the reception of a BLA signal, the CLF/RLG sequence is exchanged. On the outgoing side, an REL message (Cause 127) is sent to the succeeding exchange
36、. The RLC message completes the release sequence. A repeat attempt is made on another circuit by the preceding exchange. 10 Recommendation 4.698 (03/93) - ITU-T RECMN*B-b98 93 Y862591 0591731 529 4.1.2 Continuity failure on an outgoing ISDN-UP circuit Figure IO shows the failure to receive the conti
37、nuity check-tone from the succeeding exchange within its timeout period of two seconds. A COT (failure) message is sent to the succeeding exchange. A repeat attempt will be made on another circuit and it is assumed that the repeat attempt also fails. In such a case of double failure, a CFL (call fai
38、lure) signal is sent to the preceding exchange. On the incoming side, a CLF/RLG sequence completes the signalling sequence. 4.1.3 Figure 11 shows the REL message received from the succeeding exchange. The cause value in the message will determine which CCITT No. 6 signal will be sent to the precedin
39、g exchange. The mapping table in the same figure shows this information. An RLC message is sent to the succeeding exchange. On the incoming side, a CLFRLG sequence completes the signalling sequence. Release signal received before address complete 4.1.4 Figure 12 shows the failure to receive an ACM s
40、ignal within its 20-30 second timeout. A REL message (Cause 31) is sent to the succeeding exchange indicating the failure condition. On the incoming side, a CFL (call failure) signal is sent to the preceding exchange. Then, a CLFKLG sequence completes the signalling sequence. Timeout on address comp
41、lete message 4.1.5 Timeout on answer message Figure 13 shows the failure to receive an ANM message within its 1 .S-3 minute timeout. After the timeout period, the call is cleared in both directions. A call failure message (CFL) is sent to the preceding exchange and the REL message (Cause 19) is sent
42、 to the succeeding exchange. An RLC message is then returned by the succeeding exchange. On the incoming side, RLG signal is returned on receipt of CLF signal. 4.1.6 Reset circuit received before ACM Figure 14 shows the RSC signal received before the succeeding exchange sends back the ACM message. A
43、n RLC message is sent to the succeeding exchange and a repeat attempt is made on another circuit. 4.1.7 Reset circuit received after ACM Figure 15 shows the RSC message received after the succeeding exchange sends back the ACM message. An RLC message is sent to the succeeding exchange. On the incomi
44、ng side, a CFL signal is sent to the preceding exchange. Then, a CLF/RLG sequence completes the signalling sequence. 4.1.8 Dual seizure (controlling exchange) Figure 16 shows the IAM message received from the succeeding exchange in a dual qeizure situation. The incoming IAM message is ignored and ca
45、ll Set-up continues as if it were a normal call. 4.1.9 Dual seizure (non-controlling exchange) Figure 17 shows the IAM message received from the succeeding exchange in a dual seizure situation. The incoming IAM message is processed as a normal call. The non-controlling exchange backs off and attempt
46、s to set up a call on other circuits of the same or an alternate route. 4.2 ISUP to Signalling System No. 6 4.2.1 Continuity failure on an incoming ISUP circuit Figure I8 shows the check-tone timing out after its two second timeout period. The preceding exchange issues a COT (failure) message. On th
47、e outgoing side, a CLFRLG sequence completes the signalling sequence. 4.2.2 Continuity failure on an outgoing No. 6 circuit Figure 19 shows the failure to receive the continuity check-tone from the succeeding exchange within its two second tirneout. A BLO signal is sent to the succeeding exchange. W
48、hen a BLA signal is received, the CLFRLG sequence is exchanged. A repeat attempt is made on another circuit and it is assumed that the reattempt also fails. In such a case of double continuity failure an REL message (Cause 127) is sent to the preceding exchange. An RLC message completes the signalli
49、ng sequence. Recommendation Q.698 (03/93) 11 ITU-T RECMN*Q.b98 93 M 4862591 0593732 4b5 M 4.2.3 Congestion signal received after address complete Figure 20 shows the CGC signai received after ADC signal. On the incoming side an REL message (Cause value 34) is sent to the preceding exchange indicating the congestion condition. An RLC message completes the signalling sequence. 4.2.4 Timeout on address complete message Figure 21 shows the failure to receive an ADC signal within its 20-30 second timeout. An CLF is
