Category
page 1Calling features
Caller ID
service that sends phone caller's number to the recipient of the phone call

voicemail
A voicemail system (also known as voice message or voice bank) is a computer-based system that allows callers to leave a recorded message when the recipient has been unable (or unwilling) to answer the phone. Calls may be directed to voicemail manually or automatically. The caller is prompted to leave a message that the recipient can retrieve at a later time.
conference call
telephone call with several participants
call forwarding
ability of the telephone network to redirect an incoming call from one number to another
collect call
telephone call at the called party's expense
call waiting
a telephone service