ITU-T E.132 Standardization of Elements of Control Procedures for Supplementary Telephone Services
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ITU-T E.132 Document Information:
Title
Standardization of Elements of Control Procedures for Supplementary Telephone Services
International Telecommunication Union/ITU Telcommunication Sector
Publication Date:
Jan 1, 1993
Scope:
General
CCITT Recommendation E.131 describes, in the form of code
schemes, three subscriber control procedures for supplementary
telephone services. In order to avoid undesirable proliferation of
different types of control procedures, it recommends that
Administrations wishing to make supplementary telephone services
available to their subscribers should choose one of the three code
schemes.
Each of the three code schemes requires the subscriber to send
information to the telecommunication system to which he is
connected, in a set format and in response to feedback from the
system. Certain component parts of the information sent to the
system, such as the message suffix, block separators, tone signals
and the like, may be considered to be the necessary
elements involved in the successful operation of
supplementary services.
In order to minimize confusion to foreign visitors, and maximize
the benefits that accrue from using elements of known meaning, it
is desirable to standardize the usage of elements of codes schemes
whenever possible, in particular those elements common to all three
code schemes.
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