highlandham wrote:
99% of all the cordless phones are now digital (mostly 900MHz)
Many are of the DECT type (Digitally Enhanced Communication Technology)
Those cordless phones which are GAP compatible (even when from different
manufacturers) can be used with the same base station (unit wired to
the telephone system)

Maybe in the US they are. In the rest of the world, and many sold in the US,
use the 1.8gHz band. The low end of the US 1.9gHz band overlaps the high
end of the 1.8gHz band used elsewhere, so they can be 1.8 gHz here and
1.9 gHz there. :-)

There are some 2.4gHz cordless phones, but AFAIK they are slowly being phased
out because the poorly designed ones interfere with WiFi, and the good ones
that look for a clear channel can't function in a heavy WiFi environment.

5.8gHz phones, only legal in the Americas, are similar to their 2.4 gHz cousins
and eventually as the 5.8gHz gets taken over by 802.11n networks, they too
will disapear.

BTW, GAP phones are not always useable with other base stations. In order
to access a base station a handset must register with it, and currently that
has to be done by placing both the handset and base station in registration
mode and inserting the handset into the base station. Works in theory, but
every manufacturer uses a different base design and they contacts won't mate.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM
New word I coined 12/13/09, "Sub-Wikipedia" adj, describing knowledge or
understanding, as in he has a sub-wikipedia understanding of the situation.
i.e possessing less facts or information than can be found in the Wikipedia.