1、 International Telecommunication Union ITU-T H.248.8TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Error code and service change reason description Recomme
2、ndation ITU-T H.248.8 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 p
3、rocedures H.240H.259Coding 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 multimedi
4、a 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 Mobile multimedia collaboration appli
5、cations 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-working procedures H.560H.569 BROADBAND,
6、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 APPLICATIONS FOR IPTV General aspects H.700H.
7、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 For further details, please refer to th
8、e list of ITU-T Recommendations. Rec. ITU-T H.248.8 (03/2013) i Recommendation ITU-T H.248.8 Gateway control protocol: Error code and service change reason description Summary Recommendation ITU-T H.248.8 defines the service change reasons that are used in the core ITU-T H.248.1 protocol. It lists t
9、he service change reason code associated with the service change reason code name. It provides a definition of when the service change reason is to be used. It also provides an indication of what text may be included in the service change extension to allow further interpretation of the service chan
10、ge reason. Clause 5 provides these details. This revision addresses the following aspects: Addition of new error codes: 507 Modification of error code: 511 NOTE This Recommendation has been renamed. It was formerly known as Annex L to Rec. ITUT H.248. History Edition Recommendation Approval Study Gr
11、oup 1.0 ITU-T H.248 Annex L 2001-07-29 16 2.0 ITU-T H.248.8 2002-03-29 16 2.1 ITU-T H.248.8 (2002) Amd. 1 2004-03-15 16 3.0 ITU-T H.248.8 2005-09-13 16 4.0 ITU-T H.248.8 2007-08-29 16 5.0 ITU-T H.248.8 2013-03-16 16 ii Rec. ITU-T H.248.8 (03/2013) FOREWORD The International Telecommunication Union (
12、ITU) is the United Nations 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 i
13、ssuing 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 which, in turn, produce Recommendations on these
14、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 IEC. NOTE In this Recommendation, the express
15、ion “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 certain mandatory provisions (to ensure, e.g., interoperability or applicabili
16、ty) 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 requirements. The use of such words does not suggest that compliance with the Rec
17、ommendation 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. ITU takes no position concerning the evidence, validity or applicability
18、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, which may be required to implement this
19、 Recommendation. However, 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 whats
20、oever, without the prior written permission of ITU. Rec. ITU-T H.248.8 (03/2013) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 1 4 Error codes 1 4.1 Assigning error codes . 1 4.2 Error code descriptions . 2 5 Service change reasons . 15 5.1 Assigning service change reasons 15 5.
21、2 Service change reason description 15 Rec. ITU-T H.248.8 (03/2013) 1 Recommendation ITU-T H.248.8 Gateway control protocol: Error code and service change reason description 1 Scope This Recommendation defines the error codes that are used in the core ITU-T H.248.1 protocol. It lists the error code
22、number associated with the error code name. It then provides a definition of when the error code is to be used and if the error code is defined in a package. It also provides an indication of what text may be included in the error text descriptor to allow further interpretation of the error code. Cl
23、ause 4.2 provides these details. The normal actions for failed transactions and commands apply as specified in clause 8 of ITU-T H.248.1. Packages may define error codes not documented in this Recommendation. The IANA registry should be consulted for the complete list of error codes. Error codes mar
24、ked as “not used“ are historical in nature and are for informational purposes only. These error codes should not be used. This Recommendation also defines the service change reasons that are used in the core ITU-T H.248.1 protocol. It lists the service change reason code associated with the service
25、change reason code name. It provides a definition of when the service change reason is to be used. It also provides an indication of what text may be included in the service change extension to allow further interpretation of the service change reason. Clause 5.2 provides these details. 2 References
26、 The 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
27、this 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
28、 does not give it, as a stand-alone document, the status of a Recommendation. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), Gateway control protocol: Version 3. 3 Definitions See ITU-T H.248.1. 4 Error codes 4.1 Assigning error codes The following considerations SHALL be met to register an erro
29、r code with IANA: 1) An error number and a one-line (80 characters maximum) string are registered for each error. 2) A complete description of the conditions under which the error is detected shall be included in a publicly available document. The description shall be sufficiently clear to different
30、iate the error from all other existing error codes. 3) The document should be available on a public web server and should have a stable URL. 4) Error numbers registered by recognized standards bodies shall have 3- or 4-character error numbers. 2 Rec. ITU-T H.248.8 (03/2013) 5) Error numbers register
31、ed by all other organizations or individuals shall have 4-character error numbers. 6) An error number shall not be redefined, nor modified except by the organization or individual that originally defined it, or their successors or assigns. Parameters included in the error text shall be coded accordi
32、ng to the principles as specified in Annex A or Annex B of ITU-T H.248.1. If more than one parameter is included they shall be included in the order defined in this Recommendation and separated by a comma. Error text may be included in the error descriptor, even for those error codes for which no sp
33、ecific error text is defined in this Recommendation. If error text is included it should contain the information defined in the error specification. NOTE The actions carried out after an error is discovered, which results in the sending of an error code described in clause 4.2, are specified in clau
34、se 8 of ITU-T H.248.1. 4.2 Error code descriptions 4.2.1 Error code #: 400 Name: Syntax error in message Definition: The transaction request(s) has been disregarded due to a syntax error detected at the message level. The message does not conform to the productions of messages as per Annex A or Anne
35、x B of ITU-T H.248.1 as applicable. Used when, e.g., no transaction can be parsed. Error text in the error descriptor: Comment: If the error is detected prior to determining a valid transaction ID, no meaningful action can be taken on the receipt of the error message. 4.2.2 Error code #: 401 Name: P
36、rotocol error Definition: The transaction or command request(s) has been disregarded due to a violation of Megaco protocol procedures having been detected. Error text in the error descriptor: Comment: Use more specific error codes (e.g., 505) if possible. 4.2.3 Error code #: 402 Name: Unauthorized D
37、efinition: The command is not executed due to the originator of a command not being authorized to execute that command for the termination(s) affected by it. Error text in the error descriptor: A string containing the command name is included in the error text in the error descriptor. Comment: 4.2.4
38、 Error code #: 403 Name: Syntax error in TransactionRequest Definition: The transaction request is disregarded since it failed to match production of a TransactionRequest as per Annexes A and B of ITU-T H.248.1, as applicable. Used when, e.g., it is not possible to determine the end of a transaction
39、, or when no action can be parsed. Reference: Clause 8.2.2 of ITU-T H.248.1 Error text in the error descriptor: Rec. ITU-T H.248.8 (03/2013) 3 Comment: If the error is detected prior to determining a valid transaction ID, no meaningful action can be taken on the receipt of the error message. 4.2.5 E
40、rror code #: 406 Name: Version not supported Definition: This indicates a lack of support for the protocol version indicated in the message header of the message, or in the ServiceChangeVersion parameter. In the case of the version number being indicated in the message header, the message contents a
41、re disregarded. Reference: Clauses 11.2 or 11.3 of ITU-T H.248.1 Error text in the error descriptor: Comment: 4.2.6 Error code #: 410 Name: Incorrect identifier Definition: The transaction request(s) has been disregarded due to a syntax error (illegal length or illegal character) having been found i
42、n a mId, transactionId, contextId, terminationId, propertyId, eventId, signalId, statisticsId, parameterId or requestID. Error text in the error descriptor: The concerned ID is included in the error text in the error descriptor. Comment: If the error is detected prior to determining a valid transact
43、ion ID, no meaningful action can be taken on the receipt of the error message. 4.2.7 Error code #: 411 Name: The transaction refers to an unknown ContextID Definition: The ContextID referred to by an action in the transaction request is unknown and the action is therefore disregarded. Error text in
44、the error descriptor: Comment: 4.2.8 Error code #: 412 Name: No ContextIDs available Definition: The MG is unable to create a context in response to an “Add“ or “Move“ command with CHOOSE given as the ContextId because of a shortage of resources within the MG, and the action is disregarded. Error te
45、xt in the error descriptor: Comment: 4.2.9 Error code #: 413 Name: Number of transactions in message exceeds maximum Definition: The message contains more than the maximum allowed number of transactions. If the error descriptor is returned at a message level, the message has not been executed. If th
46、e error descriptor is returned at a transaction level, the transaction has not been executed. Error text in the error descriptor: Comment: The MGC/MG should resend the message with the number of transactions reduced less than or equal to the maximum number. 4 Rec. ITU-T H.248.8 (03/2013) 4.2.10 Erro
47、r code #: 421 Name: Unknown action or illegal combination of actions Definition: Not used. Error text in the error descriptor: Comment: 4.2.11 Error code #: 422 Name: Syntax error in action Definition: The action was disregarded due to the syntax of the action not conforming to the production of an
48、actionRequest as per Annex A or B of ITU-T H.248.1, as applicable. Used when it is not possible to determine the end of an action, when, e.g., no command can be parsed. Reference: Clause 8.2.2 of ITU-T H.248.1 Error text in the error descriptor: Comment: Examples of errors are spelling errors, missi
49、ng brackets. 4.2.12 Error code #: 430 Name: Unknown TerminationID Definition: The TerminationID referred to by the command is unknown and the command is therefore disregarded. The termination ID is not found in the MG. This includes the NULL context. This is generated when the MG does not know which termination the MGC is trying to address. Error text in the error descriptor: The TerminationID is included in the error text in the error descriptor. Comment: 4.2.13 Error code #: 431 Name: No Term
