The very basic mean of operation is to drag and drop basic MSC or high-level MSC stencils to the drawing and glue the shapes to each other. Every stencil provided by SCStudio represents a given MSC symbol regardless the actual shape of the stencil. You may thus freely change the format of any shape, or rotate the drawing.

Stencils for Basic MSC

A basic MSC can be created by gluing several basic MSC stencils to form a single drawing according to the ITU-T Z.120 standard. The following figure shows various stencils in a sample basic MSC.

The following stencils may be used to draw a basic MSC
Line Instance Coregion Box Message (Left)
Message (Right) Lost Message Found Message
Action Condition Ordering (Line)
Ordering (Side-Side) Ordering (Sides) Ordering (Arrow)

Event Ordering
Events connected by an arrowed line occur in the arrow direction. If no arrow symbol is used, the event that is graphically higher occurs before the lower event within a single instance. Inside a coregion box, however, the order is not defined – events inside a coregion may occur in any order. If some ordering is demanded between a pair of events, an ordering line (and its equivalents) may be used.

Stencils for HMSC

A high level MSC (HMSC) can be created by gluing several HMSC stencils to form a single drawing according to the ITU-T Z.120 standard.The following figure shows various stencils in a sample HMSC.

The following stencils may be used to draw a HMSC
Connection Point Start Symbol End Symbol
MSC Reference Condition Connection Arrow

References
HMSC may reference basic MSC, or another HMSC drawing. Direct or indirect recursion (self references) is not allowed. The referenced charts must be on different pages of the same Visio document. This version of SCStudio cannot load MSC from external files.

Flow Direction
The incoming Connection Lines (or Arrows) must be always connected to the top edge of the node symbols, whereas the outgoing connections must be connected to the bottom edge. This version of SCStudio is not able to determine flow direction of Connection Lines between two Connection Points. You can use Connection Arrows instead.

Common Stencils

The following stencils may be used on any MSC drawing
Comment Text
Time Interval Absolute Time