Services like voicemail and call-waiting are considered enhance services. Most of the time, you will be charged extra for requesting these services; however, they are occasionally offered, free of charge, by a long-distance carrier seeking to expand their consumer base by offering incentives.
Long distance carriers provide services which include voicemail, call waiting, text messaging, and most of the time there are additional charges. Some providers issue these services free of charge as an incentive to build their customer base.
A type of Telecommunication Service that add genuine value to, and contain substantial elements additional to, the basic telecommunications switching and Transmission Network . source: EURESCOM domain:TMN usage
Any telecom service that uses computer applications to provide consumers with value-added telephone services, such as voice mail and call waiting.
A vague, multi-purpose term used to describe nearly anything that gives you better services, like call waiting, voicemail etc.
Services like voicemail, call waiting & unified messaging. Again, usually charged extra for, but sometimes offered free as an incentive from your long distance carrier.
Enhanced service is service offered over commercial carrier transmission facilities used in interstate communications, that employs computer processing applications that act on the format, content, code, protocol, or similar aspects of the subscriber's transmitted information; provides the subscriber with additional, different, or restructured information; or involves subscriber interaction with stored information.