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Chapter 9. Callflow Diagrams
Overview
The following callflow diagrams reflect the CSTA Call Event Reports received by an
application during call processing. The diagrams use Specification and Description Language
(SDL) as defined in CCITT Recommendations Z.101 to Z.104 to depict the relationship of
call state/stimulus/event report/local connection state for DBS TSAPI/CSTA events.
The following key should be used to interpret SDL symbols.
Call State
Description:
Stimulus to a Call
Description:
54
Call St ate
A DBS CSTA call state of the described call.
•
Point of view is from a monitor request.
•
An "unknown" state indicates that the state of the call is no longer of concern to the
described device and event reporting has stopped (the device is no longer connected
to the call).
Stimulus to a Call
A stimulus to a call includes the following:
•
Button pushes, flash-hook, and other manual operations.
•
DBS CSTA Service requests sent from the client application toward the call.
•
DBS switch call processing events such as call queuing, call redirected to a coverage
point, etc.
Issued April 2000
Section 470 - TSAPI Programmer's Guide
DBS-92-470
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