cellphones as room bugs

On 12/3/06, Thor Lancelot Simon <tlsrek.tjls.com> wrote:
> It's been a while since I built ISDN equipment but I do
not think this
> is correct: can you show me how, exactly, one uses
Q.931 to instruct the
> other endpoint to go off-hook?

That's the same question I have. I don't remember seeing
anything in
the GSM standard that would allow this either.

-- 
Taral <taralxgmail.com>
"You can't prove anything."
    -- Gödel's Incompetence Theorem

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On Sun, Dec 03, 2006 at 09:26:15PM -0600, Taral wrote:
> That's the same question I have. I don't remember
seeing anything in
> the GSM standard that would allow this either.
> 

I'll hazard a guess: mobile providers can send a special
type of
message (not sure if it would be classed as an SMS) with
various
settings for your phone.  They do that, for example, to set
the GPRS
settings.  IN many phones, one of the possible settings is
to
automatically answer the phone, without ringing (the feature
is used
in some of the hands-free settings).  The user would
probably notice
that the phone is in use, but there may be some other trick
around
that.

/ji

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