A network region is a logical grouping of IP endpoints, including IP stations, IP trunks, and gateways sharing the same transmission characteristics or VoIP and signaling resources. The Network-region connect (NR-CONN) MO monitors VoIP connectivity between network regions and raises:

• A warning alarm for a single failure.

  This alarm is in response to one failed background ping test between IP endpoints in separate network regions. This test is part of the background Network Region Interconnectivity Test 1417.

• Minor alarm for multiple failures.

  Once a single failure is detected, Test #1417 is re-executed between different IP endpoints in the same pair of network regions. If the test still fails between these network regions, maintenance software marks the connectivity between them as “failed.”

As a background operation during each 2-minute interval, Test #1417 checks the translated connections between 50 pairs of network regions until every translated connection has been tested, and then repeats. The Communication Manager translation table’s maximum capacity for network-region connections is 31,250. Testing every possible connection would require 625 2-minute test intervals during about 21 hours.