The following terms are used in this Recommendation in the description of clearing procedures:
- A channel is connected when the channel is part of a circuit-switched ISDN connection established according to this Recommendation.
- A channel is disconnected when the channel is no longer part of a circuit-switched ISDN connection, but is not yet available for use in a new connection.
- A channel is released when the channel is not part of a circuit-switched ISDN connection and is available for use in a new connection. Similarly, a call reference that is released is available for reuse.