ABSTRACT: This document contains the Telcordia view of generic requirements for a Distinctive Alerting feature as an Integrated Services Digital Network (ISDN)- based service operating through a Basic Access interface.

This feature, called ISDN Distinctive Alerting (I-DAL), is a terminating call management feature. It provides Distinctive Alerting treatment to the called customer when attempts are made to terminate calls placed from telephones or other qualifying terminals whose Directory Numbers (DNs) have been previously designated by the called customer and appear in an active I-DAL screening list.

This document presents requirements for the following:

• Feature Operations,
• Internal Call Processing Controls,
• Signaling/Message Structure,
• Administration/Operations,
• Interactions,
• Limitations,
• Restrictions.