A:AnswerYes, it has audible caller id that can also be turned off. When the machine picks up, you can not hear the outgoing message, but yes, you can hear the caller when/if they talk.
A:AnswerYou can use this Phone System with VOIP phone service. You need to connect the base unit to VOIP providers' terminal adapter (RJ11C) using phone cable.
A:AnswerMy apartment is about 40. feet long, and I've never lost connection from the base. I can step out onto my balcony with no trouble. I have not tried the handsets outside the confines of my own apartment. Incidentally, I am very happy with this phone overall.