Corded phones are standard phones with a cord connecting the headset to the base. Cordless phones require no wire from the headset and allow for greater mobility within the range of the phone. Cordless extension phones are add-ons that work through the same phone line as a pre-exisiting phone and base.
Some phones can handle more than one phone line. This is important if you want to use one phone but have more than one phone line.
Features
Caller ID, Call Waiting, Speakerphone, LCD Display
Speed-dial phones are able to store numbers and utilize shortcuts to dial them. Speed dial capacity refers to the quantity of numbers that the phone can remember.