ABSTRACT
Audiovisual multimedia services can be characterized in terms of the at tributes and values in Table 13.1(3).
We can use combinations of these attributes to identify some typical com mercial audiovisual multimedia services:
Multimedia conversational service; videophone and videoconferencing (point-to-point, multipoint)
Multimedia retrieval service Multimedia distribution service Multimedia message service Multimedia collection service
This chapter first addresses the standards developed by ITU-T for the multime dia conversational service. Then it covers the standards developed by DAVIC for the multimedia retrieval and distribution services. These three services are now widely deployed.
