5 seconds of conversation is enough for a new software and hardware complex to indistinguishably fake the speech of any person. So respond to unfamiliar numbers not worth, perhaps this not simply another obsessive advertisements and cold calls, and talking even with known on the telephone now helpful ask, as name is their dog. I foresee the market of electronic secretaries who are responsible for the owner of the phone with someone else’s voice and software that allows you to make sure that the caller is really who he pretends to be.