Carrier Access Multi-Service Router (MSR) Card MSR/Adit 3K GUI Reference Manual page 237

Voice over IP
Trunk Settings
Field Definition
Assignment in-out - Allows comminution in both directions. Default.
in - Allows communication in the IN direction only.
out - Allows communication in the OUT direction only.
unassigned - Puts the channel out-of-service (down).
Adit 3000 (Rel. 1.6) and MSR Card (Rel 2.0) GUI 6-31