scope:

The present document provides guidelines for real-time person-to-person communication services. The guidelines are intended for persons working in network operator, equipment manufacturer, service provider and other organizations who may influence the development of services for end-users. This includes strategic planners, sales persons, customer support personnel and conference meeting facilitators.

The services examined concern text communication, audio communication, avatar communication, data communication, video communication and multimedia communication. Service aspects include audio-video synchrony, video resolution, video delay and packet loss for fixed and mobile networks.

Some of the guidelines are developed from initial guidelines contained in TR 102 274 whilst others were created for the present document. Guidelines are provided for topics that have been identified as important for intended guideline users and for which user-based data existed or could be collected. Therefore, the development of guidelines from published literature is not exhaustive.