Services for Computer Supported Telecommunications
Applications (CSTA) - Phase I
This Standard defines Services and Event Reports for the area of Computer-Supported Telecommunications Applications (CSTA).
Thus it is focused on the provision of an application service interface between a Switching Function and a Computing Function. The CSTA application interface is intended to be disassociated from the various user-network interfaces or network-network interfaces CSTA applications may serve, observe or manipulate. Because CSTA operates with existing
telecommunications interfaces indirectly, it can and does operate generically,
so that the differences between various existing interfaces are hidden
from CSTA applications. Support of user-to-network interfaces is outside
the scope of CSTA.
The individual Services needed to support CSTA applications are enabled
via an OSI Application Layer Protocol supporting a peer-to-peer relationship
between computing and telecommunications networks. This protocol is defined in Standard
Each instance of any Service, and every instance of some types of Services
are defined as client-server relationships.
CSTA Services allow functional integration between a computing network
and a telecommunications network. However, the computing platforms that
support these functionally integrated applications, or their Application
Programming Interfaces (APIs), are outside the scope of this Standard.
Communication between the computing and switching networks may take
place via intervening networks which range from a simple point-to-point
connection to a local or wide area communications network.
It is possible for ISDN based networks, e.g. Private Telecommunications
Networks (PTNs), to provide support for CSTA applications, however there
are limitations in both this Standard and current ISDN standards that limit
the extent of this support. Thus, based upon current standards there can
be limitations on the use of PTNs for CSTA users.
Further information on the CSTA topic is also available.
The following file can be freely downloaded:
||Acrobat (r) PDF file