AT&T EL50005 Accessory Handset, Cordless Telephone With Caller ID/Call waiting Silence the ringer on the handset and base for just a moment or for an extended period of time. Input and/or save up to 20 names and numbers in the call block directory to stop unwanted calls from ringing through (Caller ID subscription Required). This technology provides superior quality sound, high protection against wiretapping, and better range than 2.4GHz and 5.8GHz phone systems, while not interfering with wireless routers. Intercom between handsets Conference between an outside line and up to 4 cordless handsets Program up to 50 names and associated phone numbers in the handset. Quickly access the directory entries by scrolling alphabetically or by entering the first letter of a name. Adjust the volume up or down to best suit your needs. Voicemail waiting indicator Quick access key for voicemail box Last 10 number redial Mute Any key answer English/Spanish/French setup menu