etc.) T.125 Multipoint Communication Protocol implementation of T.122 Service T.126 Still Image & Annotation Whiteboards, graphic display and image Protocol exchange T.127 Multipoint Binary Transfer Protocol for exchanging binary files T.128 Audio Visual Control Interactive controls (routing, identification, remote control, source selection, etc.) T.130 Real-time Architecture Interaction between T.120 and H.320 T.131 Network Specific Mappings Transport of real-time data used with T.120 over Standards for Audiographic Conferencing T.132 Real-time Link Management Creation & routing of real-time data streams T.133 Audio Visual Control Controls for real-time data streams Services T.RES Reservation Services Interaction between devices and reservation systems T.Share Application Sharing Remote control protocol Protocol T.TUD User Reservation Transporting user-defined data Figure 8-1. T. 120 Standards Family T.120 The formal title of the T.120 Recommendation is Transmission Protocols for Multimedia Data. T.120 was approved by the ITU-T in Q1, 1996. It contains a conceptual description of the T.120 series of recommendations that define multipoint transport of multimedia data in a conferencing environment. T.120 describes the interrelationships between the constituent standards that make up the Series. It also describes how the T.120 series can be used in support of other ITU-T standards, namely, the H.32X family of videoconferencing specifications. T.120 encapsulates the concepts it expresses in six supporting ITU-T recommendations, arranged in a layered hierarchy. Each layer leverages its preceding layers to define protocols and service definitions. T.121 The formal title of the T.121 Recommendation is Generic Application Template. T.121 describes a conceptual model of a T.120 application and defines those operations that are common to most T.120 application protocols. This portion of the series aims to facilitate the process of applications development. It does this by providing common structure of protocols and servic