Hi,

You are mislead by the name "silent call". In reality this does not make the phone transmit voice data, just a strong, high powered radio signal that could be used to locate the device/user by using it as a tracking beacon.

It is possible to send a command to an MS connected to openBSC afaik that activates this feature.

Cheers,

Domi

2017. aug. 15. dátummal, 14:04 időpontban samir samir.s.abed@gmail.com írta:

Hi,

I have read that silent-calls in GSM can be used to make a call to a target MS and listen to it without having the target knowing it. Is this theoretically possible ? If yes, can it be done in OpenBSC ?