Thanks for your help everyone you have given me some avenues to investigate. The Grandstream HT-502 looks interesing and I've passed its details on to my supplier. I might also need to buy a cheap 5201 off ebay and look at taking it aprt to wire it up to an amp!
Cheers
We have just finished the installation of a shiny new 3300MXe and we have a remote factory a couple of miles away that is connected by a BT 100Meg Lan extension. Its a noisy factory and they need some form of external bell / ringer flashing light so they can hear /see the phone ring.
My...
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