A very good, ckear recording started off by saying," This is  so-and-so of medical alert systems on a recorded line. Can you hear me O.K?"  I quickly  responded "Just a second while I turn my recorder on." I then hear "Grea......" , then silence.  Waited a few seconds to make sure they had disconnected then I hung up and blocked their number. Suspect they were recording responses to scam you into buying something you don't need or want.