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Harald Welte laforge at gnumonks.orgOn Tue, Jun 16, 2009 at 03:10:12PM +0200, Nordin wrote:
> Hello guys,
>
> I was reading the nanoBTS product description and found support for
> "Network Listen" feature to monitor and decode GSM base stations. Is
> that an ip.access specific protocol? If so, does anyone has the ability
> to revers engineer this particular function. That would be really great!
The network listen feature is implemented by means of GSM 12.21 "EXECUTE TEST"
methods. So the activation/initiation of the network listen mode follows
the framework as set forth by 12.21, but the actual parameters as well
as the test results are vendor-specific attributes.
As far as I have noted, if you put the BTS in this mode it ceases to work
as normal BTS, so you cannot do that while you're actually using it
productively.
I've attached a pcap protocol trace of some old recorded network listen action.
Maybe this helps you to discover and document the details.
--
- Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/
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