ITU-T H.248.23 PDF

This Recommendation defines two packages that provide enhanced alerting and data transfer capabilities for [ITU-T H.248.1]. The support of these packages is optional.

There is a direct mapping between the alert/ri pattern parameter, alert/cw pattern parameter, and to the andisp/dwa pattern parameter. Ringing patterns and call waiting patterns are paired to allow for distinctive alerting sets. In expanding this parameter in the future, it would be desirable to expand the alert/ri, alert/cw, and andisp/dwa signals together, maintaining the distinctive pattern pairings. This will continue to allow the andisp/dwa signal to have a definition independent of the alerting method, linking it only to the alerting style (pattern).