[Scstudio-devel] [ scstudio-Bugs-3530648 ] Error in renderind disconnected MSC

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Bugs item #3530648, was opened at 2012-05-29 13:01
Message generated for change (Comment added) made by pomate
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Category: Visio Interface
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Gilberto Tavan (pomate)
Assigned to: Matus  Madzin (madzin)
Summary: Error in renderind disconnected MSC

Initial Comment:
I've noticed SCstudio has a bug in import function, when rendering of disconnected MSC.
When a new instance of a node pops up, the messages are placed at the beginning of the .vsd file,
they should be always added after the last message.

Having multiple interfaces (IPaddresses) is quite common in SIP applications.

In the attachment an example of SIP Call Flow, where the rendering is incorrect.


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Comment By: Gilberto Tavan (pomate)
Date: 2012-06-09 07:20

Message:
Hi Matus,

Your interpretation is absolutely correct, sorry I could have been more
clear in my explanations.

Using .pcap timestamps as references would give a correct temporal order,
which would then render the MSC exactly as mscgen.exe does, but with the
great advantage of editing capabilities thanks to SCstudio.
The time constraint would solve the problem, if time constraint implies a
graphical spacing on the Y-axis.

The correct order and a constant spacing is more than enought in most MSC
Diagrams in my area of expertise  (which is Telecomunications) 

Talking about Z120 import  .mpr files produced by pcap2z120.py do not
contain timestamps, but I think that correct temporal order and constant
spacing could be easier to implement and have a better aesthetical result.

Thanks to you all for this unique and handy tool.

BR

Gilberto

PS I've searched for import procedure in the source code, but I can't find
them easily.
 

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Comment By: Matus  Madzin (madzin)
Date: 2012-06-03 09:14

Message:
Hi, 
Firstly I would like to thank Mr. Tavan for good report. Now, I replay to
xrehak's comment. 

Actually, I can confirm that it's basic feature of MSC, but I don't like
any of xrehak's suggestions. 

If I understand the problem correctly, Mr. Tavan wants a linearization over
all messages in an MSC diagram. To reach this functionality by clear
solution, I suggest to set time stamp of each message from pcap as an
absolute time constraint and create new feature of SCStudio to linearize
messages in MSC diagram if it's possible (when the diagram is created from
pcap file, it should be always possible).

I think, it would be correct to assign this ticket to feature request
category.

Matus 

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Comment By: Vojtech Rehak (xrehak)
Date: 2012-05-29 23:18

Message:
Actually, it is a basic feature of MSC that disconnected events on
different instances can be placed arbitrarily. 

I suggest two solutions:
- consider the interfaces of a single computer as standalone components and
add some messages between these interfaces representing internal
communication proceed within the computer; hence, the relevant messages
will not be disconnected any more. (Ok. this should be hardly achieved from
pcap. )
- consider the multiple interfaces as nicknames of the same computer and
make a single instance representing all of them together (Matus, is there
any possibility to specify this by parameters of pcap2z120.py?)

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