Some TSPI functions provide limited support for control of a media stream. A service provider typically implements these functions to prevent data loss in configurations in which the information of a call is passed between client and server computers.
If a service provider supports media control, it must accept requests to carry out actions on the media stream when given events occur, such as on receiving a specific tone or DTMF digit in the media stream. For example, the service provider might receive a request to suspend the media stream when it detects a # DTMF digit, and resume the media stream when it detects a * DTMF digit.
Media control is optional.