Why does my phone ring a half ring at random times when no call is incoming?

Question

The landline rings a couple of times a day and display shows "incoming call" but there is no call coming. I have dsl but filters on all jacks. Only does it with some phones but those phones do it no matter which jack they are attached to.

Answer 1

Telecom guys call it "false ring". Your phone ring detection setting is too low that it can detect line noise as valid ring hence the half ring at random times.

Have a telephone technician check your line and your phone.