Additionally, a few RBOCs introduced new features such as Call Waiting Deluxe and Message Waiting Indicator; the former being perhaps the most involved example of ADSI capabilities and the latter being an example of Visual FSK; another new technology available through CLASS.
Additionally, a few RBOCs introduced new features such as Call Waiting Deluxe and Message Waiting Indicator to work exclusively with ADSI telephones. The former being perhaps the most involved example of ADSI capabilities and the latter being an example of Visual FSK; another new technology available through CLASS.