TELECOM Digest OnLine - Sorted: Re: Replacement for Siemens Gigaset

Re: Replacement for Siemens Gigaset

Thor Lancelot Simon (
Fri, 18 Nov 2005 23:55:09 UTC

In article <>, Robert Bonomi
<> wrote:

> In article <>,
> DevilsPGD <> wrote:

>>> The phone and the base station have to negotiate the spreading code
>>> used for each session. If you can eavesdrop on that negotiation, you
>>> _can_ predict the frequency hops, rendering it 'trivial' to track as a
>>> third-party listener.

>> Sure, except that the negotiation is typically performed by the base
>> and handset via a wired connection OR at extremely low power (since it
>> only happens when they're physically connected)

> What happens if you turn the handset off, then back on, when it is
> _out_ of the base?

The claim about "negotiating the spreading code only when they're
physically connected" is plainly false: if it were true, the
multi-handset phones now so popular simply wouldn't work. After all,
each handset has its own charging stand; only one of these is the

Thor Lancelot Simon

"The inconsistency is startling, though admittedly, if consistency is
to be abandoned or transcended, there is no problem." - Noam Chomsky

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