The Dial Plan Transparency feature can work in an endpoint-only stub network region. Stub network regions use the media processing resources of the core network regions they are connected to. If the Dial Plan Transparency feature is administered in the destination core network region of a stub network region, then during a network outage, the endpoints in the stub network region can connect to endpoints in other network regions.

IGAR is not available for stub network regions from 251 to 2000, but stub network regions from 1 to 250 support IGAR if the stub network region contains a gateway or a Port Network.

Stub network regions have the location field administered in the network region forms. When an endpoint in a stub network region dials an emergency number, the ARS location table analyzes the dialed number and routes the call to the destination using a predefined route pattern.

For Communication Manager managed bandwidth, emergency calls will always connect despite administered bandwidth limit exhaustion. If the emergency calls connect despite bandwidth limit exhaustion, the BW-Used field under the status ip-network-region <no> page may cross the administered bandwidth limit.