On 19.04.2006, at 04:40, Jeff Morriss wrote:
Andreas Fink wrote:
Hello,
I'm trying to do a display filter to include a specific TCAP
transaction ID which in my example is hex 040F (its displayed like
this in the tcap dissector). When I do tcap.id == "040F" it is not
being accepted. The dialog to enter this hints me to the fact that
only a one byte numerical value is being allowed. this would be
wrong as transaction ID's can be one or two bytes.
Hmmm, "tcap.identifier" is registered as FT_BYTES which appears to
mean you need to use a filter like "tcap.identifer == 04:0f".
Oh. that helps to know :)
Similar problem I'm having if I try to filter using mtp3
pointcodes. They are displayed in ITU format X-XXX-X but I cant
enter them like this, I must enter them in 14 bit numerical value
(which requires external translation by hand).
They should also be displayed on decimal, at least in the MTP3
dissector (something like "Originating Point Code NNNN (X-XXX-X)".
It does at some places. It does not in the summary list when you
filter for MTP3 (the places where you would see source IP/destination
IP) is the popupated with ITU formatted pointcodes. It also does not
in MTP3 management messages like a Routing update (TFP or TFA).
That's the part where you really want to see both formattings.
Probably easy to fix but my first attempt to play with dissector
source resulted in a crash :-/.
Yes, this is one of the problems with the dissection of MTP3 point
codes: the structured MTP3 point code string is only appended to
the point code item, it is not added as a filterable field (except
in ANSI and China ITU where the PCs are always formatted as a 8-8-8
string). (Another problem is that not all dissectors show you the
structured format.)
Ok so we should add this to the "todo" list. Might do it myself once
I figure out on how to write dissectors properly. EMI/UCP is also a
missing one I wanted to add.
Andreas Fink
Fink Consulting GmbH
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