With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vsFramerFrmUnderRuns
vs Framer Frm Under Runs
1.3.6.1.4.1.562.2.4.1.80.2.15.1.9
This attribute counts the number of times that a frame was needed but was not available because it had been delayed too long in the network. This error may occur repeatedly if the interface clocks at the two access points to the network are operating at different rates.
Back to Nortel-Magellan-Passport-VoiceMIB MIB page.
IPHost Network monitor allows you to monitor vsFramerFrmUnderRuns 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.