Ethereal-dev: RE: [Ethereal-dev] Patch to expose OPC/DPC from MTP3, SCCP preferences

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From: "Michael Lum" <mlum@xxxxxxxxxxxxx>
Date: Thu, 4 Dec 2003 17:09:17 -0800
I wanted to make the following changes to the MTP3 dissector:

1.  Add two hidden uint32 fields for 24bit OPC/DPC
	This allows display filtering using the complete 24 bit integer value
	as an alternative to something like "mtp3.ansi_opc == 214-170-26".

	i.e.  "mtp3.24bit_opc == 0x66aad6" or "mtp3.24bit_opc == 6728406"

2.  Modify OPC/DPC subtree label for ANSI/Chinese ITU to show the decimal
	value in addition to the current display of (x-y-z).
	i.e.	DPC (214-140-5) 363734

3.  Modify OPC/DPC label to show 3-8-3 in addition to the decimal 14 bit
value
	i.e.	.... .... .... .... ..00 0111 1010 0000 = DPC: (0-244-0) 1952

Now for the AT_SS7PC formats:

OK we have a few suggestions:

Format TYPE decimal (for ITU/ANSI/Chinese ITU):
	decimal

Format TYPE NI-decimal (for ITU/ANSI/Chinese ITU):
	NI-decimal

Format TYPE "formatted":
	8-8-8		(ANSI/Chinese ITU)
	3-8-3		(ITU)

What is the best way to allow a preference to specify an address format ?

> -----Original Message-----
> From: Jeff Morriss [mailto:morriss@xxxxxxxxx]
> Sent: Thursday, December 04, 2003 10:48 AM
> To: mlum@xxxxxxxxxxxxx
> Cc: ethereal Development List
> Subject: Re: [Ethereal-dev] Patch to expose OPC/DPC from MTP3, SCCP
> preferences
>
>
>
>
> Michael Lum wrote:
> > I will add AT_SS7PC.
> >
> > Does anyone have any suggestions for PC formatting ?
> >
> >>From the packet-mtp3.c dissector I will take the following:
> >
> > ANSI/CHINESE ITU	x-y-z where each of x, y and z are 8 bit values.
> >
> > ITU MTP3 Q.704 does not seem to indicate a format for the PC other
> > than being a 14 bit value.  However, I have seen it represented as
> > a-b-c where a and c are 3 bits and b is 8 bits.
> >
> > Our engineers prefer the 14 or 24 bit decimal value as opposed to
> > any formatting because then there is no ambiguity about the value.
> >
> > I have also seen:
> >
> > 	8.8.8		for 24-bit point codes
> > 	3-8-3		for 14-bit
> >
> > I.e. the '.' versus '-' was supposed to indicate 24 versus 14 bit.
> >
> > Anybody else have input ?
>
> I have a fairly strong preference for the "8-8-8" for ANSI PC's and a
> similar--but less strong--preference for Chinese ITU.  (In fact I'd like
> to, at some point, find a way for M3UA to display its point codes like
> this instead of just decimal.)
>
> I've also contemplated adding a way to display ITU PCs as 3-8-3 so it
> would be cool if this were available as a preference.
>