Signal Computing System Architecture (SCSA) is an industry standard architectural framework for the hardware and software components in a computer-telephony integration system. The framework has three layers:
- Applications, which control the media portion of a call (play, record, voice recognition , and other applications) and the call flow.
- The Software Model, which provides programming interfaces for manipulating the media portion of a call. This portion of the framework includes the SCSA Telephony Applications Objects (TAO) Framework. It also includes the call control framework and possible interfaces such as Telephony Application Program Interface , TSAPI, and JTAPI.
- The Hardware Model, consisting of one of two bus protocols, ANSI/VITA SCBus or ECTF H.100 CT Bus.
Both the Hardware Model and the Software Model layers can interface with intelligent switch , such as those used in the Advanced Intelligent Network ( AIN ), and with the Public Switched Telephone Network ( PSTN ) or the Internet.