According to Nortel Devices, Internet Protocol Flow Information eXport (IPFIX) has evolved as an improvement upon the Netflow V9 protocol. It is an upcoming standard that has been proposed by an IETF Working Group - http://www.ietf.org/html.charters/ipfix-charter.html. IPFIX is an effort to standardize on architecture for IP flow measurement and export. In an IPFIX model, an exporter such as a switch or router collects IP flows and then exports the IP flow information using a transport protocol to a collection server or servers. An IP flow is defined as a set of packets over a period of time that has some common properties.
Please refer to the PDF document published by Sonicwall in this page to configure IPFIX flow exports from your Nortel Devices.