With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
btdsLCoRoundTripDelay
btds L Co Round Trip Delay
This attribute contains the time taken for a packet (cell) of 44 bytes to be transmitted to the remote LCo and return to this LCo. The number reported is given in milliseconds to the nearest millisecond. A value of one millisecond is reported if the time is less than 1 millisecond even though the delay may be less than 1 Millisecond when the LCo is originated and terminated on the same module.
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IPHost Network monitor allows you to monitor btdsLCoRoundTripDelay 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.