With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
ipivcDnaIncCalls
ipivc Dna Inc Calls
This attribute, if set to a value of allowed indicates that incoming calls (from the network to the DTE) can be made to this DNA. If set to a value of disallowed, then incoming calls cannot be made to this DNA - such calls will be cleared by the local DCE. This attribute corresponds to the CCITT 'Incoming Calls Barred' feature for DNAs in that incoming calls are barred if this attribute is set to a value of disallowed. Either outCalls, or incCalls (or both) must be set to a value of allowed for this DNA to be useable.
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IPHost Network monitor allows you to monitor ipivcDnaIncCalls 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 modems right now.