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Hi I have the same situation as you
I have ordered BT infinity and waiting for my line to be activated, now my CD 1500 caller display is not working, but my other phones are
How to I get BT to change the polarity of the line as you describe ?
My Infinity is self installed, with no engineer visit
The CD 1500 is not compatible with broadband, due to the fact that the filters in the equipment, cannot pass the correct signalling conditions. This has been known about since broadband was first implemented. I had a CD 1500, which stopped working when I got broadband, a long time ago.
If you need a stand-alone caller display, then all of the new models will cope with the DTMF data burst which is transmitted along the line, before the first burst of ringing current.