1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T H.248.16 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services Communication procedures Gateway control protocol: Enhanced digit collec
2、tion packages and procedures Recommendation ITU-T H.248.16 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 Syste
3、ms aspects H.230H.239 Communication procedures H.240H.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 arch
4、itecture for audiovisual and multimedia services H.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
5、 Mobile multimedia collaboration applications and services 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-wor
6、king procedures H.560H.569 BROADBAND, TRIPLE-PLAY AND 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 APPLICA
7、TIONS FOR IPTV General aspects H.700H.719 IPTV terminal 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 F
8、or further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.248.16 (03/2013) i Recommendation ITU-T H.248.16 Gateway control protocol: Enhanced digit collection packages and procedures Summary Recommendation ITU-T H.248.16 defines two packages that provide enhanced digit coll
9、ection capabilities for Recommendation ITU-T H.248.1: extended DTMF digit map completion event, incorporating detailed reporting of timeouts, digit buffering control, and reporting and control of processing of extra events; enhanced DTMF digit map completion event, incorporating additional digit col
10、lection procedures for reporting a completion event. This Revision incorporates a new Completion Event “Unsuccessful Match Reporting“ parameter in the “Extended DTMF detection“ and “Enhanced DTMF detection“ packages. History Edition Recommendation Approval Study Group 1.0 ITU-T H.248.16 2002-11-29 1
11、6 1.1 ITU-T H.248.16 (2002) Cor. 1 2004-03-15 16 2.0 ITU-T H.248.16 2013-03-16 16 ii Rec. ITU-T H.248.16 (03/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs).
12、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 standardizing telecommunications on a worldwide basis. The World Telecommunication Stan
13、dardization 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 by the procedure laid down in WTSA Resolution 1. In some areas of informatio
14、n 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 both a telecommunication administration and a recognized operating agency. C
15、ompliance with this Recommendation is voluntary. However, the Recommendation may contain certain 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 othe
16、r 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 required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or impleme
17、ntation 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 Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process.
18、As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urg
19、ed 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 written permission of ITU. Rec. ITU-T H.248.16 (03/2013) iii Table of Contents Page 1 Scope 1 2 References. 1
20、 3 Definitions 1 4 Abbreviations and acronyms 1 5 Extended DTMF detection package . 1 5.1 Properties 1 5.2 Events . 2 5.3 Signals 4 5.4 Statistics 4 5.5 Procedures 4 6 Enhanced DTMF detection package . 6 6.1 Properties 6 6.2 Events . 7 6.3 Signals 8 6.4 Statistics 8 6.5 Procedures 8 Rec. ITU-T H.248
21、.16 (03/2013) 1 Recommendation ITU-T H.248.16 Gateway control protocol: Enhanced digit collection packages and procedures 1 Scope This Recommendation defines two packages that provide enhanced digit collection capabilities for ITU-T H.248.1. The support of these packages is optional. 2 References Th
22、e following ITU-T Recommendations 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 thi
23、s Recommendation are 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 do
24、es not give it, as a stand-alone document, the status of a Recommendation. ITU-T H.248.1 Recommendation ITU-T H.248.1 v3 (2013), Gateway control protocol: Version 3. 3 Definitions None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: DTMF Dual Tone Mul
25、ti Frequency MG Media Gateway MGC Media Gateway Controller 5 Extended DTMF detection package Package name: Extended DTMF detection package Package ID: xdd (0x0052) Description: This package provides an extended DTMF digit map completion event, incorporating detailed reporting of timeouts, digit buff
26、ering control, and reporting and control of processing of extra events. Version: 2 Extends: dd (0x0006) version 2 5.1 Properties None. 2 Rec. ITU-T H.248.16 (03/2013) 5.2 Events 5.2.1 Extended DigitMap Completion Event Event name: Extended DigitMap Completion Event Event ID: xce (0x0005) Description
27、: Generated when a digit map completes as described in clause 7.1.14 of ITU-T H.248.1, or in clause 5.5, Procedures, of this Recommendation, as appropriate. 5.2.1.1 EventsDescriptor parameters 5.2.1.1.1 Buffer Control Parameter name: Buffer Control Parameter ID: bc (0x0001) Description: Maximum peri
28、od for which digit buffering should occur following reporting of this event, in seconds. Type: Integer Optional: Yes Possible values: 0 upwards. Default: 0 5.2.1.1.2 Extra Digit Disposition Parameter name: Extra Digit Disposition Parameter ID: xdd (0x0002) Description: If ON, an extra digit event tr
29、iggering digit map completion by causing mismatch to all candidate patterns is discarded. If OFF, the extra digit event is processed as indicated by step 5 of the appropriate matching procedures. Type: Boolean Optional: Yes Possible values: ON or OFF. Default: OFF 5.2.1.1.3 Match Procedure Parameter
30、 name: Match Procedure Parameter ID: mp (0x0003) Description: Indicates which matching procedures should be used for this digitmap. Type: Enumeration Optional: Yes Possible values: base or enhanced. “base“ (0x0001) Use match procedures described in clause 7.1.14 of ITU-T H.248.1. “enhanced“ (0x0002)
31、 Use match procedures described in clause 5.5. Rec. ITU-T H.248.16 (03/2013) 3 Default: Base 5.2.1.1.4 Unsuccessful Match Reporting Parameter name: Unsuccessful Match Reporting Parameter ID: umr (0x0004) Description: The MGC may use this parameter to control whether the DigitMap Completion Event is
32、generated in the event of an unsuccessful DigitMap match (i.e., match with method “Partial match“ or “Full Match“). Type: Boolean Optional: Yes Possible values: On Generate DigitMap Completion Event on unsuccessful match. Off Do not generate a DigitMap Completion Event on an unsuccessful match. Defa
33、ult: On 5.2.1.2 ObservedEventsDescriptor parameters 5.2.1.2.1 DigitString Parameter name: DigitString Parameter ID: ds (0x0001) Description: The portion of the current dial string as described in the appropriate match procedures which matched part or all of an alternative event sequence specified in
34、 the digit map. Type: String Optional: No Possible values: A sequence (possibly empty) of the characters 0 through 9, A through F, and the long duration modifier Z. If the completion event was triggered by timer expiry, the character T, S, or L, shall be appended to the end of the dial string to ind
35、icate which timer expired (detailed timeout reporting). Default: None 5.2.1.2.2 Termination Method Parameter name: Termination Method Parameter ID: meth (0x0002) Description: Indicates the reason for generation of the event. See the appropriate match procedures. Optional: No Type: Enumeration Possib
36、le values: “UM“ (0x0001) Unambiguous match “PM“ (0x0002) Partial match, completion by timer expiry or nmatched event 4 Rec. ITU-T H.248.16 (03/2013) “FM“ (0x0003) Full match, completion by timer expiry or unmatched event Default: None 5.2.1.2.3 Unmatched Event Parameter name: Unmatched Event Paramet
37、er ID: extra (0x0003) Description: The observed digit event which triggered the completion event by failing to match any candidate pattern. Type: String Optional: Yes Possible values: Not included if completion was not triggered by an unmatched event (extra digit). Otherwise, one of the characters 0
38、 through 9 or A through F, preceded by the Z qualifier if relevant to the mismatch and descriptive of the observed event. Default: None 5.3 Signals None. 5.4 Statistics None. 5.5 Procedures 5.5.1 Enhanced match procedures These procedures outline the “shortest match“ method of processing digitmaps.
39、These procedures shall be used when the “enhanced“ match procedures are specified in the completion event. 5.5.1.1 DigitMap definition, creation, modification and deletion These procedures are identical to those in clause 7.1.14.1 of ITU-T H.248.1. 5.5.1.2 DigitMap timers The collection of digits ac
40、cording to a DigitMap may be protected by three inter-event timers, viz. a start timer (T), a short timer (S), and a long timer (L). 1) The start timer (T) is used prior to any digits being available for processing against the digit map. 2) The start timer (T) is used prior to any digits having been
41、 dialled. 3) If the Media Gateway can determine that at least one more digit is needed for a digit string to match any of the allowed patterns in the digit map, then the long interdigit timer (L) should be used (e.g., 16 seconds). 4) If the digit string has matched one of the patterns in a digit map
42、, that match shall be reported immediately as a full match unless a timing specifier is indicated at the end of the digitstring. If a timing specifier is present, the MG must apply the timer indicated and wait for more digits. Rec. ITU-T H.248.16 (03/2013) 5 In addition to these inter-event timers,
43、a digit map may also require use of a timer on tone duration. This is used when the digit map contains the Z duration modifier to discriminate between short- and long-duration digit events. Default values of these timers should be provisioned on the MG, but can be overridden by values specified with
44、in the DigitMap. 5.5.1.3 DigitMap syntax The digit map syntax shall be the same as that described in clause 7.1.14.3 of ITU-T H.248.1, with the exception of the dot symbol. The matching rules outlined below will always result in matching zero repetitions of the final digit if a terminal dot symbol i
45、s used. Therefore, a digitstring should never be terminated by a dot symbol, but rather should always be terminated by an explicit event. In the event that a terminal dot symbol is present, and the “enhanced“ procedures are requested, the MG shall process the map as it is specified; that is to say,
46、in the event that the pattern with the terminal dot symbol is the last remaining, the MG shall report a full match upon detection of the “dotted“ event, as the dot is instantly matched to zero repetitions. The dot symbol is, effectively, ignored. 5.5.1.4 DigitMap completion event These procedures ar
47、e identical to those in clause 7.1.14.4 of ITU-T H.248.1. By default, DigitMaps are processed according to the procedures of clause 7.1.14, notification is sent to MCG when the DigitMap has completed (see clause 7.1.14.4 of ITU-T H.248.1), and any embedded signals and embedded events are triggered.
48、However, if the Unsuccessful Match Reporting parameter is set to “off“ and the DigitMap completion was triggered as a result of an unsuccessful match, then the DigitMap completion event is not notified to the MGC nor are embedded signals and/or embedded events triggered. However, the DigitMap will b
49、e de-activated. 5.5.1.5 DigitMap procedures Pending completion, successive events shall be processed according to the following rules: 1) The “current dial string“, an internal variable, is initially empty. The set of candidate alternative event sequences includes all of the alternatives specified in the digit map. 2) At each step, if buffered digits are available, the oldest one (with possible accompanying long digit (Z) qualifier) is removed from the buffer and processing moves to the next step as
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