M00001177
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ISO/IEC 18051 6th Edition, September 1, 2012 Information technology - Telecommunications and information exchange between systems - Services for Computer Supported Telecommunications Applications (CSTA) Phase III
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Availability date: 07/13/2021
Description / Abstract:
This International Standard specifies the Services and Event
Reports for Computer-Supported Telecommunications Applications,
Phase III (CSTA).
This International Standard is focused on providing application
service interfaces to a Switching Function, Computing Function and
a Special Resource Function. A CSTA application interface is
disassociated from the various user-network interfaces and
network-network interfaces CSTA applications may serve, observe or
manipulate. Because CSTA operates with existing telecommunications
interfaces indirectly, it operates generically, so that differences
among various existing interfaces are hidden from CSTA
applications. Support of user-to-network interfaces is outside the
scope of CSTA.
Although most terminal equipment (TE) are suitable for use with
CSTA there will be instances of TE that will not be suitable in
certain circumstances. Examples are:
• FAX terminals and modems that are unable to adjust their
transmission modes to prevent carrier conflict when both parties
are alerted via CSTA during call establishment;
• Functional terminals that perform telecommunication functions
outside the control of the Switching Function.
Services defined in this International Standard allow functional
integration between a computing network and a telecommunications
network. Computing platforms (i.e., Application Programming
Interfaces - APIs) that support such functionally-integrated
applications are outside the scope of this International
Standard.
Communication between the computing and switching (i.e.,
telecommunications) networks may take place via intervening
networks ranging from simple point-to-point connections to local-
or wide-area telecommunications networks.
This International Standard is part of a suite of CSTA Standards
and Technical Reports that provide a comprehensive description of
the architectural and practical issues involved in applying,
implementing, and utilizing CSTA-based CTI applications.