Ideally if you do not want to receive calls for these DNIS the telco should not route it to your T1 because the T1 will be blocked till you reject it on your gateway. If that is not possible there are quite a few configurations to block it on you gateway, as follows :
Introduction: The "external-out enable" command is available for
configuration under the "router ospf process" in case of the IOS-XR
operating system. This command basically enables advertisement of
intra-area routes on the device as external routes in th...
Introduction Basic configuration for netflow Scale parameters for
netflow Netflow support Architecture Packet flow for netflow Inside the
LC CPU Netflow Cache size, maintenance and memory Sample usage Cache
Size Aging Permanent cache Characteristics Which...