With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrBrNsAteDomainNum
Virtual Router Br Ns Ate Domain Num
This attribute specifies the domain number associated with a frame, that would qualify it partly, for a match in the apply table. The domain number provisioned will form a part of the match criteria only if it is not provisioned with a wild card value of 0. If the wild card character is specified, any domain number will satisfy the match criteria, in effect loosing domain number as a qualifier in the match criteria.
Back to Nortel-Magellan-Passport-BridgeMIB MIB page.
IPHost Network monitor allows you to monitor vrBrNsAteDomainNum on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel speech servers right now.