Description: This attribute specifies the default class of routing for reliability routing for all outgoing calls (from the DTE to the network) using this particular Dna. The chosen default class of routing applies to all outgoing calls established using this Dna, and applies to the packets travelling in both directions on all outgoing calls (local to remote, and remote to local). For incoming calls, the default class of routing is chosen by the calling party (as opposed to DPN, where either end of the call can choose the default routing class). This attribute, if set to a value of normal, indicates that the default class of routing is normal reliability routing. If set to a value of high, then the default class of routing is high reliability routing. High reliability is the standard choice for most DPN and Passport services. It usually indicates that packets are overflowed or retransmitted at various routing levels. Typically high reliability results in duplication and disordering of packets in the network when errors are detected or during link congestion. However, the Vc handles the duplication and disordering to ensure that packets are delivered to the DTE properly. For the Frame Relay service, duplication of packets is not desired, in which case, normal reliability may be chosen as the preferred class of routing.