[Guy Harris <gharris@xxxxxxxxx>]

LEGO wrote:
> the only dtap-only traces I've found so far are text dumps generated
> by a program attached to a mobile with a "debug" firmware. I haven't
> yet seen any other types of dtap-only traces (I'll have a chat with a
> friend of mine that actually tests the mobile phones, he'll ceratinly
> know better than me)
>
> dtap is used to have the mobile to "talk" to the MSC (to the SGSN
> too?) and is normally encapsulated inside NBAP, RANAP, BSSAP in its
> way to the Mobile or MSC.

So would a graph, similar to the one you had, plus an explanation of the 
various abbreviations, be a useful addition to

	http://wiki.ethereal.com/GSM

for the benefit of those not familiar with the mobile phone world (or 
should it just refer to the Wikipedia page for that?  That page, and 
Wikipedia pages to which it refers, have a bunch of information not 
protocol-related, and doesn't seem to have a lot of stuff explaining 
what protocol layers there are).