I think it was Bill Simpson who wrote:

> I've advocated for a half dozen years now that we approach some mass 
> commercial vendor of wireless phones (say vtech or conair) and ask 
> to add security code.  These phones are all digital spread spectrum, 
> yet connect to normal analog lines.  No reasons why the security 
> couldn't be end-to-end.

Lots of reasons.  The base unit of those phones has a D-A
converter, and talks to the analog network.  The digital part is only
for the over-the-air connection.  And even that is not mandatory; you
can do spread-spectrum and still have analog modulation.

/ji, anxiously waiting for his Starium phones.

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