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robert robert.steve07 at gmail.comHi, Thank you for this explanation. Best regards, Robert, On Mar 11, 2016, at 5:04 PM, Harald Welte <laforge at gnumonks.org> wrote: > Hi 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/ > ============================================================================ > "Privacy in residential applications is a desirable marketing option." > (ETSI EN 300 175-7 Ch. A6)