On Sun, 07 Aug 2005 17:10:37 GMT, David Taylor <djtaylor@bigfoot.com>
wrote:

>> Well, it's a bit more difficult that it appears. One of the problems
>> I previously hinted is that in order to "wireless-tap" a VoIP
>> conversation, it is necessary to hear both radios that are involved.

>What about if that's Joe at home using a wireless VoIP phone to his home
>AP? No other radio (as in phone) involved, just off to some SIP proxy
>through his phone service provider.
>David.

Same problem. Let's say the access point can be heard from the
street. But the 802.11 VoIP handset is wandering all over the house.
There's no problem hearing the return side of the conversation coming
from the access point, but picking up the handset will be difficult.
As soon as Joe Sixpack puts a few walls between himself and the
sniffing antenna, the signal will be lost or full of reflections. You
get to sniff only one side of the conversation.

I know a sneaky way around this problem, but I don't wanna disclose
any secrets.


--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
AE6KS 831-336-2558