Reliable Transmission of Voice Messages
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
As users of voice store and forward equipment require more flexible transmission of messages, it has become necessary to transmit messages between remote equipment. For example, a corporation may have large offices in New York and Los Angeles and desire transmission of voice messages between these two sites. Dedicated transmission facilities between such sites may be prohibitively expensive. A cost-effective mechanism is to use the public telephone network. The public telephone network has the following notable disadvantages: 1) insufficient bandwidth for economical digital transmission of high quality voice messages, 2) variable and sometimes unacceptable impairments for analog transmission of high quality voice messages, and 3) control information cannot be transmitted at the same time as a high quality analog voice message.