Firstly its exchange line impedance probably does not exactly match that provided by our (very very long) phone lines. This can result in some calls being a bit "quiet". Secondly, the poor thing gets confused by the automated BT line tests and rings once in response to a test (it also rings if you unplug the line from the master socket).
Is anyone aware of a gizmo that one can interpose betwixt line and PABX to improve the matching, and hopefully stop it sensing the brief disconnection from the lines during a test?
Ready made gadget or circus diagram would do...
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