1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.1902.4TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(12/2002) SERIES Q: SWITCHING AND SIGNALLING Specifications of signalling related to Bearer Independent Call Control (BICC) Bearer Independent Call Control protocol (Capability Set 2): Bas
2、ic call procedures Amendment 1: Support for the International Emergency Preference Scheme ITU-T Recommendation Q.1902.4 (2001) Amendment 1 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING
3、Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEM No. 4 Q.120Q.139 SPECIFICATIONS OF SIGNALLING SYSTEM No. 5 Q.140Q.199 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250Q.309 SPECIFICATI
4、ONS OF SIGNALLING SYSTEM R1 Q.310Q.399 SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLI
5、C LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.200
6、0Q.2999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. Q.1902.4 (2001)/Amd.1 (12/2002) i ITU-T Recommendation Q.1902.4 Bearer Independent Call Control protocol (Capability Set 2): Basic call procedures Amendment 1 Support for the International Emergency Preference
7、 Scheme Summary This amendment was produced to meet the urgent need for the implementation of the International Emergency Preference Scheme (IEPS) as specified in ITU-T Rec. E.106. This amendment contains the modifications to ITU-T Rec. Q.1902.4 (07/01) in order to accommodate these needs. This amen
8、dment should be read in connection with the related amendments to ITU-T Recs Q.1902.1, Q.1902.2, Q.1902.3 and Q.1950. Source Amendment 1 to ITU-T Recommendation Q.1902.4 (2001) was prepared by ITU-T Study Group 11 (2001-2004) and approved under the WTSA Resolution 1 procedure on 29 December 2002. ii
9、 ITU-T Rec. Q.1902.4 (2001)/Amd.1 (12/2002) FOREWORD The International Telecommunication Union (ITU) 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 te
10、chnical, operating and tariff questions 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 whic
11、h, in turn, produce Recommendations 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 ISO and
12、IEC. NOTE In this Recommendation, 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 Recommendat
13、ion may involve the use of a claimed Intellectual 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
14、of this Recommendation, ITU had not received 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 paten
15、t database. ITU 2003 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. Q.1902.4 (2001)/Amd.1 (12/2002) iii CONTENTS Page 1) Clause 4 Abbreviations 1 2) Clause 7.2.2.3 Actions required at an intermediat
16、e international SN 1 3) Clause 7.2.3.3 Actions required at an intermediate international CMN 1 4) Clause 7.2.4.3 Actions required at an outgoing international gateway SN . 2 5) Clause 7.2.5.3 Actions required at an outgoing international gateway CMN . 2 6) Clause 7.2.6.3 Actions required at an incom
17、ing international gateway SN 3 7) Clause 7.2.7.3 Actions required at an incoming international gateway CMN 3 8) Clause 7.4 Outgoing bearer set-up procedure 3 9) Clause 7.5 Incoming bearer set-up procedure . 4 ITU-T Rec. Q.1902.4 (2001)/Amd.1 (12/2002) 1 ITU-T Recommendation Q.1902.4 Bearer Independe
18、nt Call Control protocol (Capability Set 2): Basic call procedures Amendment 1 Support for the International Emergency Preference Scheme 1) Clause 4 Abbreviations Add the following new abbreviations alphabetically: CPC Calling Partys Category IEPS International Emergency Preference Scheme 2) Clause
19、7.2.2.3 Actions required at an intermediate international SN Add the following: b) International Emergency Preference Scheme: i) If the CSF, at an intermediate international SN, receives a call with CPC set to IEPS, the call establishment proceeds with priority. The call is established with the CPC
20、set as IEPS call marking in the outgoing IAM. Restrictive network management controls (e.g. Automatic Call Gapping, Automatic Congestion Control, Hard-to-Reach procedure) are not applied to this call. ii) For an IEPS-call, the codec negotiation procedures are not to be invoked. If codec negotiation
21、is already invoked on a preceding bearer path, the SN shall terminate the codec negotiation procedures and the call shall proceed. iii) If routing procedures fail to find an outgoing CIC value, the call is queued and shall take precedence over any other normal call attempts. iv) Optionally, if queui
22、ng occurs, an early ACM (called party status set to “no indication“) with the inclusion of the generic notification parameter set to “call completion delay“ may be returned to the preceding CSF. However, if the incoming IAM had indicated “COT to be expected“, the early ACM (no indication) shall not
23、be sent until Continuity Message (COT) with Continuity Indication has been received. 3) Clause 7.2.3.3 Actions required at an intermediate international CMN Add the following: b) International Emergency Preference Scheme: i) If the CSF, at an intermediate international CMN, receives a call with CPC
24、set to IEPS, the call establishment proceeds with priority. The call is established with the CPC set as IEPS call marking in the outgoing IAM. Restrictive network management controls (e.g. Automatic Call Gapping, Automatic Congestion Control, Hard-to-Reach procedure) are not applied to this call. ii
25、) If routing procedures fail to find an outgoing CIC value, the call is queued and shall take precedence over any other normal call attempts. 2 ITU-T Rec. Q.1902.4 (2001)/Amd.1 (12/2002) iii) Optionally, if queuing occurs, an early ACM (called party status set to “no indication“) with the inclusion
26、of the generic notification parameter set to “call completion delay“ may be returned to the preceding CSF. However, if the incoming IAM had indicated “COT to be expected“, the early ACM (no indication) shall not be sent until Continuity Message (COT) with Continuity Indication has been received. 4)
27、Clause 7.2.4.3 Actions required at an outgoing international gateway SN Add the following: c) International Emergency Preference Scheme: i) If the CSF, at an outgoing international gateway SN, receives information from the national network that the call is to be treated as an IEPS call (e.g. CPC val
28、ue of IEPS), call establishment proceeds with priority. The call is established with the CPC set as IEPS call marking in the outgoing IAM. Restrictive network management controls (e.g. Automatic Call Gapping, Automatic Congestion Control, Hard-to-Reach procedure) are not applied to this call. ii) Fo
29、r an IEPS-call, the codec negotiation procedures are not to be invoked. If codec negotiation is already invoked on a preceding bearer path, the SN shall terminate the codec negotiation procedures and the call shall proceed. iii) If routing procedures fail to find an outgoing CIC value, the call is q
30、ueued and shall take precedence over any other normal call attempts. iv) Optionally, if queuing occurs, an early ACM (called party status set to “no indication“) with the inclusion of the generic notification parameter set to “call completion delay“ may be returned to the preceding CSF. However, if
31、the incoming IAM had indicated “COT to be expected“, the early ACM (no indication) shall not be sent until Continuity Message (COT) with Continuity Indication has been received. 5) Clause 7.2.5.3 Actions required at an outgoing international gateway CMN Add the following: b) International Emergency
32、Preference Scheme: i) If the CSF, at an outgoing international gateway CMN, receives information from the national network that the call is to be treated as an IEPS call (e.g. CPC value of IEPS), call establishment proceeds with priority. The call is established with the CPC set as IEPS call marking
33、 in the outgoing IAM. Restrictive network management controls (e.g. Automatic Call Gapping, Automatic Congestion Control, Hard-to-Reach procedure) are not applied to this call. ii) If routing procedures fail to find an outgoing CIC value, the call is queued and shall take precedence over any other n
34、ormal call attempts. iii) Optionally, if queuing occurs, an early ACM (called party status set to “no indication“) with the inclusion of the generic notification parameter set to “call completion delay“ may be returned to the preceding CSF. However, if the incoming IAM had indicated “COT to be expec
35、ted“, the early ACM (no indication) shall not be sent until Continuity Message (COT) with Continuity Indication has been received. ITU-T Rec. Q.1902.4 (2001)/Amd.1 (12/2002) 3 6) Clause 7.2.6.3 Actions required at an incoming international gateway SN Add the following (after the Note): a) Internatio
36、nal Emergency Preference Scheme: i) If the CSF, at an incoming international gateway SN, receives a call with CPC set to IEPS, the call establishment proceeds with priority. The call is established with the CPC set as IEPS call marking or national specific information for IEPS call treatment in the
37、outgoing IAM. Restrictive network management controls (e.g. Automatic Call Gapping, Automatic Congestion Control, Hard-to-Reach procedure) are not applied to this call. ii) For an IEPS-call, the codec negotiation procedures are not to be invoked. If codec negotiation is already invoked on a precedin
38、g bearer path, the SN shall terminate the codec negotiation procedures and the call shall proceed. iii) If routing procedures fail to find an outgoing CIC value, the call is queued and shall take precedence over any other normal call attempts. iv) Optionally, if queuing occurs, an early ACM (called
39、party status set to “no indication“) with the inclusion of the generic notification parameter set to “call completion delay“ may be returned to the preceding CSF. However, if the incoming IAM had indicated “COT to be expected“, the early ACM (no indication) shall not be sent until Continuity Message
40、 (COT) with Continuity Indication has been received. 7) Clause 7.2.7.3 Actions required at an incoming international gateway CMN Add the following (after the Note): a) International Emergency Preference Scheme: i) If the CSF, at an incoming international gateway CMN, receives a call with CPC set to
41、IEPS, the call establishment proceeds with priority. The call is established with the CPC set as IEPS call marking or national specific information for IEPS call treatment in the outgoing IAM. Restrictive network management controls (e.g. Automatic Call Gapping, Automatic Congestion Control, Hard-to
42、-Reach procedure) are not applied to this call. ii) If routing procedures fail to find a outgoing CIC value, the call is queued and shall take precedence over any other normal call attempts. iii) Optionally, if queuing occurs, an early ACM (called party status set to “no indication“) with the inclus
43、ion of the generic notification parameter set to “call completion delay“ may be returned to the preceding CSF. However, if the incoming IAM had indicated “COT to be expected“, the early ACM (no indication) shall not be sent until Continuity Message (COT) with Continuity Indication has been received.
44、 8) Clause 7.4 Outgoing bearer set-up procedure Add the following new paragraph at the end: The BCF shall select appropriate bearer resources for a call with CPC set to IEPS to ensure that the quality of the bearer path is guaranteed throughout the lifetime of the call. This applies both to the set-
45、up phase of the call as well as to the connection phase of the call in case of congested network situations. The CSF shall accordingly pass an emergency call indicator to the BCF in the BNC Information Request primitive and/or in the Bearer Set-up Request primitive. 4 ITU-T Rec. Q.1902.4 (2001)/Amd.
46、1 (12/2002) 9) Clause 7.5 Incoming bearer set-up procedure Add the following new paragraph at the end: The BCF shall select appropriate bearer resources for a call with CPC set to IEPS to ensure that the quality of the bearer path is guaranteed throughout the lifetime of the call. This applies both
47、to the set-up phase of the call as well as to the connection phase of the call in case of congested network situations. The CSF shall accordingly pass an emergency call indicator to the BCF in the BNC Information Request primitive and/or in the Bearer Set-up Request primitive. Printed in Switzerland
48、 Geneva, 2003 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series B Means of expression: definitions, symbols, classification Series C General telecommunication statistics Series D General tariff principles Series E Overall network operation, telephone service, service
49、operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M TMN and network maintenance: international transmissi
