caller id to open electric gate

[<umar@xxxxxxx>]

Last year when we were looking to buy a house rather than build we visited
a
new housing estate built near us. The estate agent waited outside and
when
we arrived he used his mobile phone to call somewhere, and magically
(!!)
the gate opened. We were most impressed.

Anyone any ideas how this can be achieved - caller id and comfort ? man
on
other  end of phone to push "open" button ;-). Seriously,
anyone any ideas ?

Umar


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