1、 International Telecommunication Union ITU-T H.248.26TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Enhanced analogue lines packages Recommendation ITU-T H
2、.248.26 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Communication procedures H.24
3、0H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architecture for audiovisual and multimedia services H.
4、360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multimedia collaboration applications and s
5、ervices H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND, TRIPLE-PLAY A
6、ND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 Ubiquitous sensor network applications and Internet of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV term
7、inal devices H.720H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.780H.789 For further details, please refer to the list of ITU
8、-T Recommendations. Rec. ITU-T H.248.26 (03/2013) i Recommendation ITU-T H.248.26 Gateway control protocol: Enhanced analogue lines packages Summary Recommendation ITU-T H.248.26 defines several packages that provide support for extended line supervision and metering analogue lines capabilities for
9、Recommendation ITU-T H.248.1. This version adds a phased metering signal suitable for use with complex metering scenarios that are beyond the capability of the metering signals already present in the package. It also introduces a new package to perform metering pulse detection by media gateways, and
10、 updates all the packages in this Recommendation to conform to the new packages template. This revision incorporates updates to the default behaviour of the “Pulse Repetition Interval“, “Burst Pulse Count“ and “Pulse Repetition Interval“ parameters. History Edition Recommendation Approval Study Grou
11、p 1.0 ITU-T H.248.26 2003-07-14 16 1.1 ITU-T H.248.26 (2003) Cor. 1 2004-03-15 16 1.2 ITU-T H.248.26 (2003) Amd. 1 2005-01-08 16 2.0 ITU-T H.248.26 2005-01-08 16 3.0 ITU-T H.248.26 2013-03-16 16 ii Rec. ITU-T H.248.26 (03/2013) FOREWORD The International Telecommunication Union (ITU) is the United N
12、ations specialized agency in the field of telecommunications, information and communication technologies (ICTs). 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 Recommendatio
13、ns 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 which, in turn, produce Recommendations on these topics. The approval
14、 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 IEC. NOTE In this Recommendation, the expression “Administration“
15、 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 certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance w
16、ith 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 requirements. The use of such words does not suggest that compliance with the Recommendation is requi
17、red 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. ITU takes no position concerning the evidence, validity or applicability of claimed Intellect
18、ual 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 received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However
19、, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior
20、 written permission of ITU. Rec. ITU-T H.248.26 (03/2013) iii Table of Contents Page 1 Scope 1 2 References. 2 3 Definitions 2 4 Abbreviations and acronyms 2 5 Extended Analogue Line Supervision package 3 5.1 Properties 3 5.2 Events . 3 5.3 Signals 3 5.4 Statistics 3 5.5 Procedures 4 6 Automatic Met
21、ering package 4 6.1 Properties 4 6.2 Events . 4 6.3 Signals 5 6.4 Statistics 9 6.5 Procedures 9 7 Metering Pulse Detection package . 18 7.1 Properties 18 7.2 Events . 18 7.3 Signals 20 7.4 Statistics 20 7.5 Error code . 21 7.6 Procedures 21 Bibliography. 24 Rec. ITU-T H.248.26 (03/2013) 1 Recommenda
22、tion ITU-T H.248.26 Gateway control protocol: Enhanced analogue lines packages 1 Scope The Analogue Line Supervision package defined in Annex E of ITU-T H.248.1 supports basic telephony services, using on-hook and off-hook events, and a ringing signal. Some telephony services delivered over analogue
23、 line terminations have additional supervisory signalling requirements that are not met by the Analogue Line Supervision package. The packages defined in this Recommendation are intended to meet the needs of the following supervisory signalling functions: Line-side answer supervision: This function
24、provides a positive notification to a calling line that the called line has answered. This notification may be used by customer premises equipment, for example, to begin timing the call for local billing or charging purposes. Network disconnect: Many switching systems provide this signal following t
25、he termination of an active call if a party remains off-hook for some period of time following the other party going on-hook. The network disconnect notification may be used by customer premises equipment to release resources associated with the call. Metering pulses: Metering services provide subsc
26、ribers with real-time information about charging of calls in progress. These services make use of customer premises equipment that shows a count of “units“ consumed by chargeable calls, where each unit has a fixed monetary value. To increment the counter in the metering equipment, the switching syst
27、em sends certain kinds of pulses over the line, either during the call or immediately following termination of the call. These pulses typically consist of short bursts of 12-kHz or 16-kHz tones, although other types of metering pulse such as brief periods of polarity reversal or 50-Hz tones are also
28、 seen. To meet these needs, two supplemental packages are introduced: The Extended Analogue Line Supervision package is defined as an extension of the Basic Analogue Line Supervision package, and includes two new signals: Line-Side Answer Supervision and Network Disconnect. This package provides sup
29、port for all the Loop-Start supervisory signalling requirements identified by b-Telcordia GR-506-CORE. The Automatic Metering package provides a means to apply metering pulses on an analogue line termination. The package includes: signals requesting the automatic application of pulses at fixed inter
30、vals as well as the application of pulse bursts; statistics that may be used to track the actual number of pulses applied; and an event that may be used to trigger periodic reporting of the count of pulses applied. This Recommendation introduces a phased metering signal suitable for use with complex
31、 metering scenarios. It also introduces a new metering detection package that can be used to instruct the MG to detect and report metering pulses generated by a network peer. The support of these packages is optional. 2 Rec. ITU-T H.248.26 (03/2013) 2 References The following ITU-T Recommendations a
32、nd 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 therefore enco
33、uraged 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 stand-alone do
34、cument, the status of a Recommendation. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), Gateway Control Protocol: Version 3. 3 Definitions This Recommendation defines the following terms: 3.1 add-on charge: An optional one-time charge incurred mid-call. 3.2 charge interval: The frequency at which
35、 charges are incurred. Some metering models do not accommodate this parameter. 3.3 charge rate: The rate at which currency charges are applied in a call in currency per second. 3.4 phase duration: The length of a phase. Phase duration may be finite or infinite. 3.5 pulse count: The count of the numb
36、er of pulses which are to be applied. 3.6 pulse count per charge interval: The pulse count for a specific charge interval, calculated as the product of Tariff Pulse Rate and Charge Interval (PCCI = TPR CI). 3.7 pulse repetition interval: See definition in clause 6.3.1.1.2. 3.8 set-up charge: An opti
37、onal one-time charge for call set-up. 3.9 tariff pulse rate: The rate (pulses per second) at which pulses are applied as derived from the tariff rate data and pulse conversion data specified by the service provider. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations an
38、d acronyms: CI Charge Interval MG Media Gateway MGC Media Gateway Controller PC Pulse Count PCCI Pulse Count per Charge Interval PD Phase Duration PRI Pulse Repetition Interval TPR Tariff Pulse Rate Rec. ITU-T H.248.26 (03/2013) 3 5 Extended Analogue Line Supervision package Package Name: Extended A
39、nalogue Line Supervision package Package ID: xal (0x0043) Description: This package defines events and signals necessary to support analogue telephony services where line-side answer supervision and/or network disconnect capabilities are required. Version: 1 Extends: al (0x0009) version 1 5.1 Proper
40、ties None. 5.2 Events None. 5.3 Signals 5.3.1 Line-side Answer Supervision Signal name: Line-side Answer Supervision Signal ID: las (0x0003) Description: Indicates that the called party has answered. The signal that is sent on the line is provisioned in the MG. Typically this signal involves a rever
41、sal of polarity of the current feed on the line. Signal type: On/Off Duration: Not applicable 5.3.1.1 Additional parameters None. 5.3.2 Network Disconnect Signal name: Network Disconnect Signal ID: nd (0x0004) Description: Indicates that the far-end party has disconnected. The signal that is sent on
42、 the line is provisioned in the MG. Typically this signal involves a brief removal of the dc voltage on the line. Signal type: Brief Duration: Provisioned 5.3.2.1 Additional parameters None. 5.4 Statistics None. 4 Rec. ITU-T H.248.26 (03/2013) 5.5 Procedures The Network Disconnect signal is typicall
43、y used when a called or calling party remains off-hook after the other party has hung up. In these circumstances, some telephony services provide dial tone to the off-hook phone after a period of several seconds has elapsed. The Network Disconnect signal would normally be applied just prior to the r
44、e-application of dial tone on the line. 6 Automatic Metering package Package Name: Automatic Metering package Package ID: amet (0x0044) Description: This package supports the automated application of repetitive metering pulses to an analogue line termination. It provides a facility whereby the actua
45、l number of metering pulses applied to the termination can be periodically reported to the MGC for verification purposes. Version: 2 Extends: None 6.1 Properties None. 6.2 Events 6.2.1 Periodic Report Event name: Periodic Report Event ID: pr (0x0001) Description: This event is used in conjunction wi
46、th the “Enable Metering“ and “Metering Pulse Burst“ signals defined in this package. It is detected when the value of the “pulse count since last report“ statistic reaches the value specified in the “report period“ parameter. This event does not have any parameters for the observed event descriptor
47、since it will be reported only when “pulse count since last report“ is equal to “report period“, which is a value already known to the MGC. This event is not detected when the application of signals is stopped due to a MG failure, a customer line state event (e.g., on-hook), or by an explicit comman
48、d from the MGC. The MGC needs to read the value of the statistic “pulse count since last report“ in those cases, using an AuditValue command. 6.2.1.1 EventsDescriptor parameters 6.2.1.1.1 Report Period Parameter name: Report Period Parameter ID: rp (0x0001) Description: This parameter specifies the
49、period of metering reports in terms of pulse counts. There is no default value for this parameter, and it must be specified with a non-zero value. Rec. ITU-T H.248.26 (03/2013) 5 Type: Integer Optional: No Possible values: Any positive number of pulses Default: None 6.2.1.2 ObservedEventsDescriptor parameters None. 6.3 Signals 6.3.1 Enable Metering Signal name: Enable Metering Signal ID: em (0x0001) Description: This signal starts the automatic generation of metering pulses on the termination. The type and duration of
