BT Decor 2600 Advanced Call Blocker - 83154 This BT telephone with nuisance call blocking features a 200 name and number memory. It also has an answer machine recording time of 30 minutes, and has multi-award winning true Call call blocking technology. This product also has a speaker and ringer volume control, and 3 ringtone options. Telephone with nuisance call blocking 200 name and number memory 3 ringtones Speaker and ringer volume control Answer machine recording time: 30 min