Top features nuisance call blocking keeps unwanted numbers from ringing answering machine so you can be notified of missed calls hands free speaker option for added convenience nuisance call blockingstay in touch with family and friends with the bt essential cordless phone. With nuisance call blocking, you can stop certain numbers ringing and disturbing you. You can block up to an astonishing 100 numbers so you never have to worry.answering machinewith the built in answer machine, you'll never have to miss out on calls again. People can leave you messages and caller id will tell you who exactly has called so you can easily contact them back.hands free speakerthe hands free speaker makes it easier for you to take calls. Whether you're getting dinner ready or looking for the item you lost the other week, you can place your caller on loudspeaker and continue the conversation while you focus on the task in hand.