To program the Trunk Group Busy RAD:
In the Trunk Groups form, assign a Trunk Group Busy RAD number to provide a RAD announcement to callers when all trunks in the group are busy.
Ensure that the RAD's COS is programmed with the Busy Tone Timer set to a higher value than the ANSWER PLUS - Message Length Timer to prevent announcements being cut off before completion.
In the Trunk Groups form, assign a RAD's directory number to the Trunk Group Busy field.