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Within these five groupings there are numerous possible communication services. For example, with audio-telephony there is conventional telephony (e.g., desk-based), audio-conferencing (e.g., hands-free) and mobile telephony.

The main distinctions between individual communication services within a service grouping are mode of use (e.g., office, mobile) and quality of service (e.g., fixed network, mobile network).

The main distinctions between communication service groupings are the types of communication media with which users can interact. For example, an Avatar-phone combines the audio medium of audio-telephony with virtual reality graphics. Videoconferencing replaces the graphic medium of an Avatar-phone with video. Multimedia conferencing has the audio and video media of videoconferencing plus the availability of data (e.g., simultaneous viewing of a computer-based application such as PowerPoint).

A primary question for Eye-2-Eye is whether both differences in communication media and quality of service parameters have important implications for fitness-for-purpose.