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Harald Welte laforge at gnumonks.orgHi Robert,
On Fri, Mar 11, 2016 at 04:05:15PM +0200, robert wrote:
> I would like to know what are the capabilities of the silent-call
> implemented in OpenBSC. When I try the command from VTY, I do not get
> any useful information from the target. Should it be like a normal
> call where I can listen to the called number but without having the
> target notified?
a silent call is a pure signalling connection, it does not have any
actual voice data. It serves primarily the purpose of turning the MS
into a permanently (on one TS) transmitting beacon that can be localized
using various radio-localization techniques.
We implemented the feature in order to demonstrate/show-case some of the
GSM "mis-features" that are being abused by signalling intelligence /
law enforcement devices.
--
- Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/
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