1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.1950TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2002) SERIES Q: SWITCHING AND SIGNALLING Specifications of signalling related to Bearer Independent Call Control (BICC) Bearer independent call bearer control protocol ITU-T Recommendation Q.1950 I
2、TU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING 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 SPECIFICAT
3、IONS 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 SPECIFICATIONS OF SIGNALLING SYSTEM R1 Q.310Q.399 SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNAL
4、LING 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 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUI
5、REMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. Q.1950 (12/2002) i ITU-T Recommendation Q.1950 Be
6、arer independent call bearer control protocol Summary This Recommendation provides the procedures, commands, parameters, messages and signalling information of the Bearer Independent Call Bearer Control (CBC) protocol for the support of narrow-band ISDN services independent of the bearer technology
7、and signalling message transport technology used. Source ITU-T Recommendation Q.1950 (2002) was revised by ITU-T Study Group 11 (2001-2004) and approved under the WTSA Resolution 1 procedure on 29 December 2002. ii ITU-T Rec. Q.1950 (12/2002) FOREWORD The International Telecommunication Union (ITU)
8、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 questions and issuing Recommendations on them with a view to standardiz
9、ing 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 topics. The approval of ITU-T Recommendations is covered
10、 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 IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate
11、 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 Intellectual Property Right. ITU takes no position concerning th
12、e 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 notice of intellectual property, protected by patents, w
13、hich 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. ITU 2003 All rights reserved. No part of this publication may be reproduced, by any means
14、 whatsoever, without the prior written permission of ITU. ITU-T Rec. Q.1950 (12/2002) iii CONTENTS Page 1 Scope 1 2 References. 1 2.1 Normative References 1 2.2 Informative References 2 3 Abbreviations 2 4 Definitions 3 4.1 Object and call model definitions. 3 4.2 Call model 4 4.3 Requests and respo
15、nses 4 4.4 Definition of signalling flow objects 4 5 BICC network CBC Capability Set 8 5.1 Compatibility rules . 8 5.2 Naming conventions. 8 5.3 Topology descriptor 8 5.4 Transaction timers 8 5.5 Transport. 8 5.6 Encoding. 8 5.7 Mandatory support of SDP and Annex C/H.248.1 information elements 8 5.8
16、 Required standard packages . 13 5.9 BICC Packages. 13 6 CBC Procedures . 14 6.1 Nomenclature . 14 6.2 CBC procedures and encoding . 15 7 CBC procedures Call related. 15 7.1 CSM transactions 15 7.2 BIWF Transactions. 32 8 CBC procedures General. 37 8.1 General CBC procedure information 37 8.2 CSM tr
17、ansactions 38 8.3 BIWF transactions 44 9 CBC procedures Outage and recovery 50 9.1 CSF transactions. 50 9.2 BIWF Transactions. 51 iv ITU-T Rec. Q.1950 (12/2002) Page 10 Formats and codes 52 10.1 Formats and codes General . 52 10.2 Formats and codes Commands 53 10.3 Formats and codes Signalling objec
18、ts . 54 10.4 Example protocol encoding 58 Annex A Q.1950 packages 60 A.1 Introduction 60 A.2 References 60 A.3 Bearer characteristics package . 61 A.4 Bearer network connection cut-through package. 62 A.5 Reuse idle package . 63 A.6 Generic bearer connection package 63 A.7 Bearer control tunnelling
19、package 66 A.8 Basic call progress tones generator with directionality 68 A.9 Expanded call progress tones generator package . 70 A.10 Basic services tones generation package 72 A.11 Expanded services tones generation package. 73 A.12 Intrusion Tones Generation Package 75 A.13 Business tones generat
20、ion package 78 Annex B Call bearer control Continuity test 80 B.1 Introduction 80 B.2 References 80 B.3 Definitions 80 B.4 Abbreviations . 80 B.5 Definition of signalling flow objects 80 B.6 Continuity check CBC capability set . 80 B.7 CBC procedures Call related. 80 B.8 Formats and codes 83 Annex C
21、 Call bearer control BIWF congestion handling 84 C.1 Introduction 84 C.2 References 85 C.3 Definitions 85 C.4 Abbreviations . 85 C.5 Definition of signalling flow objects 85 C.6 BIWF resource congestion handling CBC capability set. 85 C.7 CBC procedures General. 85 C.8 Formats and codes 87 ITU-T Rec
22、. Q.1950 (12/2002) v Page Annex D Call bearer control N 64K . 87 D.1 Introduction 87 D.2 References 87 D.3 Definitions 88 D.4 Abbreviations . 88 D.5 Definition of signalling flow objects 88 D.6 N 64K CBC capability set. 88 D.7 CBC procedures Call related. 88 D.8 Formats and codes 89 Annex E Call bea
23、rer control Extensions for access networks that support BICC . 90 E.1 Introduction 90 E.2 References 90 E.3 Definitions 90 E.4 Abbreviations . 90 E.5 Definition of signalling flow objects 90 E.6 CBC capability set for access networks that support BICC. 90 E.7 CBC procedures Call related. 90 E.8 Form
24、ats and codes 92 E.9 Package Definition . 92 Annex F Call bearer control Emergency call indication 93 F.1 Introduction 93 F.2 References 93 F.3 Definitions 93 F.4 Abbreviations . 93 F.5 Definition of signalling flow objects 93 F.6 Emergency service capability set . 94 F.7 CBC procedures Call-related
25、. 94 F.8 Formats and codes 95 ITU-T Rec. Q.1950 (12/2002) 1 ITU-T Recommendation Q.1950 Bearer independent call bearer control protocol 1 Scope This Recommendation specifies the formats, codes and procedures of the Call Bearer Control Interface. Its scope is limited to the interface between the CSF
26、and the BCF. The base of the Call Bearer Control protocol is H.248.1 that is tailored through the use of a BICC Capability Set and packages of the H.248.x subseries. T11111900-01CSFBCFBIWFCCUTerminationAccess half /Network halfScope of RecommendationTerminationBICCNetwork halfFigure 1/Q.1950 Scope o
27、f this Recommendation The main body of the Recommendation details the protocol for the BICC Network Half of the CBC interface. Protocols for the Access Half and Non-BICC Network Half of the interface are contained in associated annexes or separate Recommendations. 2 References The following ITU-T Re
28、commendations and other references 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 revision; users of this Recommendation are
29、 therefore encouraged to investigate 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. The reference to a document within this Recommendation does not give it, as a
30、 stand-alone document, the status of a Recommendation. 2.1 Normative References 1 ITU-T Recommendation H.248.1 (2002), Gateway control protocol: Version 2. 2 ITU-T Recommendation H.248.7 (2000), Gateway control protocol: Generic Announcement package. 3 ITU-T Recommendation I.230 (1988), Definition o
31、f bearer service categories. 2 ITU-T Rec. Q.1950 (12/2002) 4 ITU-T Recommendation Q.765.5 (2000), Signalling system No. 7 Application transport mechanism: Bearer Independent Call Control (BICC). 5 ITU-T Recommendation Q.1902.3 (2001), Bearer Independent Call Control protocol (Capability Set 2) and S
32、ignalling system No. 7 ISDN user part: Formats and codes. 6 ITU-T Recommendation Q.2150.0 (2001), Generic Signalling Transport Service. 7 ITU-T Recommendation X.213 (2001), Information technology Open Systems Interconnection Network service definition. 8 IETF RFC 2327 (1998), SDP: Session Descriptio
33、n Protocol. 9 IETF RFC 1890 (1996), RTP Profile for Audio and Video Conferences with Minimal Control. 2.2 Informative References 10 ITU-T Q-series Recommendations Supplement 32 (2002), Technical Report TRQ.2141.1: Signalling requirements for the support of narrow-band services via broadband transpor
34、t technologies CS-2 signalling flows. 11 ITU-T Q-series Recommendations Supplement 35 (2000), Technical Report TRQ.2500: Signalling requirements for the support of the call bearer control interface (CS-1). 12 ITU-T Q-series Recommendations Supplement 7 (1999), Technical Report TRQ.2001: General aspe
35、cts for the development of unified signalling requirements. 3 Abbreviations This Recommendation uses the following abbreviations: AAL ATM Adaptation Layer AESA ATM End System Address ATM Asynchronous Transfer Mode BCF Bearer Control Function BIT Bearer Information Transport BIWF Bearer Interworking
36、Function BNC Backbone Network Connection CBC Call Bearer Control CSF Call Service Function CSM Call State Machine GSN Gateway Serving Node IP Internet Protocol ISN Interface Serving Node MG Media Gateway MGC Media Gateway Controller MOD Modify MOV Move NOT Notify ITU-T Rec. Q.1950 (12/2002) 3 O-BIWF
37、 Originating Bearer Interworking Function PDU Protocol Data Unit SUB Subtract T-BIWF Terminating Bearer Interworking Function TDM Time Division Multiplex TMR Transmission Medium Requirement USI User Service Information 4 Definitions This Recommendation defines the following terms: 4.1 Object and cal
38、l model definitions 4.1.1 Call Bearer Control (CBC): is the interface between the Call Serving Function and the Bearer Control Function. 4.1.2 connection: The connection is a logical entity representing the connection topology within a single context in the BIWF. The topology of a connection can be
39、implied by assigning streams between terminations and/or through manipulation of the context topology. 4.1.3 context: The context is the association between one or more terminations. The BIWF creates a context and assigns a unique context identity (contextID) to it. A context cannot exist without at
40、 least one termination. When a context contains a single termination, this context may or may not contain a connection. Contexts containing a connection always will be associated with a local call instance, while a context containing no connection will not be associated with a Local Call Instance. S
41、ee 6.1/H.248.1 1. 4.1.4 end point: An end point defines the remote call or call and bearer signalling entity communicating with the CSF. This entity may be requesting actions associated with a line, trunk, or special resource function. In the object model it defines the point terminating the Call Si
42、gnalling. 4.1.5 stream: A Stream specifies the parameters of a single bidirectional media stream/user data flow and is represented by a CSM assigned StreamID. See 7.1.6/H.248.1 1. 4.1.6 stream mode: In the object model it describes the mode of the termination i.e. send, receive, send and receive. Se
43、e 7.1.7/H.248.1 1. 4.1.7 termination: A Termination is a logical entity in a BIWF that sources and/or sinks media and/or control streams. In BICC a termination sources and/or sinks a single media and/or control streams. A Termination is described by a number of characterizing Properties. Termination
44、s have unique identities (TerminationIDs). These objects can be created “On Demand“ or may be provisioned. 4.1.8 termination state: Defines the Service state of the termination e.g. In-service, Out-of-service. In the object model it describes the mode of the termination i.e. Null, Loop Back External
45、 Signal, Loop Back Internal Signal. See Termination State 7.1.5/H.248.1 1 for the service state. For the mode of a stream i.e. loopback see 7.1.7/H.248.1 1. 4.1.9 logical port: Defines a logical grouping of one or more media terminations and one or more signalling terminations. A Logical Port may be
46、 associated with a bearer control signalling end point. 4.1.10 Call State Machine (CSM): Defines a CSF control entity that terminates call or call and bearer peer-to-peer signalling. The prefix “O“ or “T“ represents the inter-relationship of CSMs 4 ITU-T Rec. Q.1950 (12/2002) within the Local Call I
47、nstance. The “O“ represents the control entity receiving an external service request, while the “T“ is the control entity forwarding the request to another CSF. 4.1.11 CCU control port: Defines the signalling port associated with the CSF which is used to interact with the BIWF over the CBC Interface
48、. This object has a unique address within the network service supplier domain. 4.1.12 BIWF control port: Defines the signalling port associated with the BIWF which is used to interact with the CCU over the CBC interface. This object has a unique address within the network service supplier domain. 4.
49、1.13 Backbone Network Connection (BNC): Represents the edge-to-edge transport connection within the backbone network, consisting of one or more Backbone Network Connection Links (BNCL). The Backbone Network Connection represents a segment of the end-to-end Network Bearer Connection (NBC). 4.2 Call model Refer to clause 6/H.248.1 1. 4.3 Requests and responses Refer to ITU-T Rec. H.248.1 1 for descriptions of command requests and responses. 4.4 Definition of signalling flo
