1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T J.171TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(05/2003) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS IPCablecom IPCablecom Trunking Gateway Control Protocol (TGCP) Amendment 1: TGC
2、P Profile 2 ITU-T Recommendation J.171 (2002) Amendment 1 ITU-T J-SERIES RECOMMENDATIONS CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations J.1J.9 General specifications for analogue sound-programme transmission J.10J.19 Performance ch
3、aracteristics of analogue sound-programme circuits J.20J.29 Equipment and lines used for analogue sound-programme circuits J.30J.39 Digital encoders for analogue sound-programme signals J.40J.49 Digital transmission of sound-programme signals J.50J.59 Circuits for analogue television transmission J.
4、60J.69 Analogue television transmission over metallic lines and interconnection with radio-relay links J.70J.79 Digital transmission of television signals J.80J.89 Ancillary digital services for television transmission J.90J.99 Operational requirements and methods for television transmission J.100J.
5、109 Interactive systems for digital television distribution J.110J.129 Transport of MPEG-2 signals on packetized networks J.130J.139 Measurement of the quality of service J.140J.149 Digital television distribution through local subscriber networks J.150J.159 IPCablecom J.160J.179 Miscellaneous J.180
6、J.199 Application for Interactive Digital Television J.200J.209 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. J.171 (2002)/Amd.1 (05/2003) i ITU-T Recommendation J.171 IPcablecom Trunking Gateway Control Protocol (TGCP) Amendment 1 TGCP Profile 2 Summary This ame
7、ndment specifies Annex B of ITU-T Rec. J.171. As a consequence of specifying Annex B, the references and abbreviations clauses of the Recommendation have been updated. Source Amendment 1 to ITU-T Recommendation J.171 (2002) was approved by ITU-T Study Group 9 (2001-2004) under the ITU-T Recommendati
8、on A.8 procedure on 14 May 2003. ii ITU-T Rec. J.171 (2002)/Amd.1 (05/2003) 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-
9、T is responsible for studying technical, 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 stud
10、y by the ITU-T study groups which, 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 c
11、ollaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain c
12、ertain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requir
13、ements. The use of such words does not suggest that compliance with the Recommendation is required of any party. 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
14、. 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/had not received notice of intel
15、lectual 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 patent database. ITU 2003 All rights reserved. No part of this pu
16、blication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. J.171 (2002)/Amd.1 (05/2003) iii CONTENTS Page 1) Amendments to clause 2 “References“. 1 2 References. 1 2.1 Normative references 1 2.2 Informative references 1 2) Amendments to clause “3.2
17、Abbreviations“. 2 3.2 Abbreviations . 2 3) New Annex B . 3 Annex B TGCP Profile 2 3 B.1 Scope 3 B.2 Architectural assumptions 3 B.3 Profile definition. 4 B.4 Support of packages . 4 B.5 Compatibility rules . 4 B.6 Naming conventions. 4 B.7 Topology descriptor 5 B.8 Multiplex descriptor . 5 B.9 Trans
18、action timers and re-transmission thresholds 5 B.10 Transport. 6 B.11 Service change procedures . 6 B.12 Security. 6 B.13 Encoding. 6 B.14 Use of SDP . 6 B.15 Timestamp 15 B.16 Digitmap. 15 Annex B.A ISUP Trunk Tones Generator Package for ITU-T Rec. H.248 16 ITU-T Rec. J.171 (2002)/Amd.1 (05/2003) 1
19、 ITU-T Recommendation J.171 IPCablecom Trunking Gateway Control Protocol (TGCP) Amendment 1 TGCP Profile 2 1) Amendments to clause 2 “References“ Amend clause 2 to read as follows: 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in th
20、is 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 therefore encouraged to investigate the possibility of applying the most recent edi
21、tion 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 stand-alone document, the status of a Recommendation. 2.1 Normative references The
22、following references apply to both Annex A and Annex B: ITU-T Recommendation J.161 (2001), Audio codec requirements for the provision of bidirectional audio service over cable television networks using cable modems. ITU-T Recommendation J.170 (2002), IPCablecom security specification. IETF RFC 2327
23、(1998), SDP: Session Description Protocol. The following references apply to Annex A only: ITU-T Recommendation J.162 (2001), Network call signalling protocol for the delivery of time-critical services over cable television networks using data modems. The following references apply to Annex B only:
24、ITU-T Recommendation H.248.1 (2002), Gateway control protocol: Version 2. ITU-T Recommendation H.248.2 (2000), Gateway control protocol: Facsimile, text conversation and call discrimination packages. IETF RFC 1035 (1987), Domain names Implementation and specification. IETF RFC 2045 (1996), Multipurp
25、ose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies. IETF RFC 2234 (1997), Augmented BNF for Syntax Specifications: ABNF. 2.2 Informative references The following references apply only to Annex A: ITU-T Recommendation E.180/Q.35 (1998), Technical characteristics of tones
26、for the telephone system. 2 ITU-T Rec. J.171 (2002)/Amd.1 (05/2003) ITU-T Recommendation H.225.0 (2003), Call signalling protocols and media stream packetization for packet-based multimedia communication systems. ITU-T Recommendation H.245 (2003), Control protocol for multimedia communication. ITU-T
27、 Recommendation H.323 (2003), Packet-based multimedia communications systems. ITU-T Recommendation J.163 (2001), Dynamic quality of service for the provision of real time services over cable television networks using cable modems. ITU-T Recommendation Q.761 (1999), Signalling System No. 7 ISDN User
28、Part functional description. ITU-T Recommendation Q.762 (1999), Signalling System No. 7 ISDN User Part general function of messages and signals. IETF RFC 1825 (1995), Security Architecture for the Internet Protocol. IETF RFC 1826 (1995), IP Authentication Header. IETF RFC 1889 (1996) RTP: A Transpor
29、t Protocol for Real-Time Applications. IETF RFC 1890 (1996), RTP: Profile for Audio and Video Conferences with Minimal Control. IETF RFC 2326 (1998) Real Time Streaming Protocol (RTSP). IETF RFC 2543 (1999), SIP: Session Initiation Protocol. IETF RFC 2705 (1999), Media Gateway Control Protocol (MGCP
30、) Version 1.0. IETF Internet Draft (draft-huitema-sgcp-v1-02.txt), Simple Gateway Control Protocol (SGCP). IETF Internet Draft (draft-taylor-ipdc-00.txt), IPDC Base Protocol. TCP/IP Illustrated, Volume 1 (2001), The Protocols, Addison-Wesley, 1994. The following references apply only to Annex B: ITU
31、-T Recommendation J.160 (2002), Architectural framework for the delivery of time-critical services over cable television networks using cable modems. IETF RFC 1889 (1996), RTP: A Transport Protocol for Real-Time Applications. IETF RFC 1890 (1996), RTP Profile for Audio and Video Conferences with Min
32、imal Control. 2) Amendments to clause “3.2 Abbreviations“ Amend clause 3.2 to read as follows: 3.2 Abbreviations This Recommendation uses the following abbreviations: ASCII American Standard Code for Information Interchange AVP Audio Visual Profile DNS Domain Name System IANA Internet Assigned Numbe
33、rs Authority IP Internet Protocol IPSec Internet Protocol Security ITU-T Rec. J.171 (2002)/Amd.1 (05/2003) 3 ISUP ISDN User Part MG Media Gateway MGC Media Gateway Controller MGCP Media Gateway Control Protocol MIB Management Information Base MTA Multimedia Terminal Adapter MWD Maximum Waiting Delay
34、 NCS Network-Based Call Signalling NTP Network Time Protocol PSTN Public Switched Telephone Network QoS Quality of Service RTCP RTP Control Protocol RTO Retransmission Timeout RTP Real-Time Transport Protocol SDP Session Description Protocol SG Signalling Gateway SPI Security Parameters Index TGCP T
35、runking Gateway Control Protocol UDP User Datagram Protocol URI Uniform Resource Identifier 3) New Annex B Annex B TGCP Profile 2 B.1 Scope This annex specifies a profile of the H.248 protocol (ITU-T Rec. H.248.1, version 2 (05/2002) for controlling media gateways between cable networks and the PSTN
36、. This profile is known as Trunking Gateway Control Protocol (TGCP) version 1. B.2 Architectural assumptions This annex applies to the interface between a Media Gateway Controller and a Media Gateway sitting at the boundary between an IPCablecom network and the PSTN. The overall architecture for int
37、erconnecting IPCablecom networks with the PSTN is described in ITU-T Rec. J.160. 4 ITU-T Rec. J.171 (2002)/Amd.1 (05/2003) B.3 Profile definition This profile shall be entitled “TGCP_H248“. The version number shall be “1“. This name shall be returned by conforming gateways when sending a ServiceChan
38、ge command as part of the initial registration of the MG. This profile is applicable to version 2 of ITU-T Rec. H.248.1 (05/2002). B.4 Support of packages B.4.1 Mandatory packages The following packages shall be supported: Table B.1/J.171 Mandatory packages Package Name Id Version Defined in Generic
39、 g 1 ITU-T Rec. H.248.1 version 2 (05/2002), Annex E Base Root root 1 ITU-T Rec. H.248.1 version 2 (05/2002), Annex E Continuity ct 1 ITU-T Rec. H.248.1 version 2 (05/2002), Annex E Network nt 1 ITU-T Rec. H.248.1 version 2 (05/2002), Annex E TDM Circuit tdmc 1 ITU-T Rec. H.248.1 version 2 (05/2002)
40、, Annex E ISUP Trunk Tones Generator isuptn 1 See Annex B.A B.4.2 Conditional packages The following packages shall be supported under the specified conditions: Table B.2/J.171 Conditional packages Package Name Id Version Defined in Condition Fax/TextPhone/ Modem Tones Detection ftmd 1 ITU-T Rec. H.
41、248.2 Some of the codecs supported by the cable networks are not transparent to fax, modem or textphone signals. B.5 Compatibility rules This profile is based on ITU-T Rec. H.248.1 version 2 (05/2002). The compatibility rules for packages, signals, events, properties and statistics and the H.248 pro
42、tocol are defined in ITU-T Rec. H.248.1 version 2 (05/2002). B.6 Naming conventions B.6.1 MG and MGC names MG and MGC names shall be in the form of a domain name IETF RFC 1035. An example MGC name is: . B.6.2 Termination identifiers B.6.2.1 Physical Termination Identifiers Termination identifiers re
43、presenting physical trunks or trunks groups shall adhere to the following conventions: Termination names shall consist of a series of terms each separated by a slash (“/“) that describe the physical hierarchy within the gateway: ITU-T Rec. J.171 (2002)/Amd.1 (05/2003) 5 ds/_/_/ The first term (ds) i
44、dentifies the termination naming scheme used and the basic termination type. The last term is a decimal number that indicates the channel number at the lowest level of the hierarchy. Intermediate terms between the first term (ds) and last term (channel number) represent intermediate levels of the hi
45、erarchy and consist of and separated by an underscore (“_“) where: the identifies the particular hierarchy level. Values of presently defined are: “s“, “su“, “oc3“, “ds3“, “e3“, “ds2“, “e2“, “ds1“, “e1“ where “s“ indicates a slot number and “su“ indicates a sub-unit within a slot. Other values repre
46、senting physical hierarchy levels that have not been included in this list but which follow the same basic naming rules will also be allowed; the is a decimal number which is used to reference a particular instance of a at that level of the hierarchy. The number of levels and naming of those levels
47、is based on the physical hierarchy within the media gateway, as illustrated by the following examples: a Media Gateway that has some number of DS1 interfaces: ds/ds1_#/# a Media Gateway that has some number of OC3 interfaces, that contain channelized DS3 and DS1 hierarchies: ds/oc3_#/ds3_#/ds1_#/# a
48、 Media Gateway that contains some number of slots with each slot having some number of DS3 interfaces: ds/s_#/ds3_#/ds1_#/# Some terminations may not contain all possible levels of a hierarchy; however, all levels supported by a given termination are contained in the termination naming scheme. For e
49、xample, a DS3 without DS1 framing could be represented by the following naming scheme: ds/s_#/ds3_#/# However, a DS3 with DS1 framing could not be represented by that naming scheme. B.7 Topology descriptor A Gateway conforming to this annex need not implement the topology descriptor. MGCs that expect to control gateways conforming to this annex shall not assume that topology descriptor is supported. B.8 Multiplex descriptor A Gateway conforming to this
