scope:

This Recommendation specifies technique-oriented characteristics of telewriting and the application of telewriting in combination with voice communication. Service-oriented requirements are defined in Recommendation F.730. In the development of this Recommendation, compatibility with other telematic services is taken into account. This Recommendation is structured in four parts:

Part 1 - Fundamental characteristics

Part 2 - Telewriting together with telephony

Part 3 - Zone coding

Part 4 - Differential chain coding.