FOREWORD
The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication
Union. The 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 Standardization Conference (WTSC), which meets every four years, established the topics for
study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics.
ITU-T Recommendation H.261 was revised by the ITU-T Study Group XV (1988-1993) and was approved by the WTSC
(Helsinki, March 1-12, 1993).
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NOTES
1
As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased
to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1
March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication
Sector.
In order not to delay publication of this Recommendation, no change has been made in the text to references containing the
acronyms “CCITT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of
this Recommendation will contain the proper terminology related to the new ITU structure.
2
In this Recommendation, the expression “Administration” is used for conciseness to indicate both a
telecommunication administration and a recognized operating agency.
© ITU 1994
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the ITU.
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