Any nortel partner can get it for you. They are very easy to install. You will need 2 upgrades. Each will take about 2 hours. Phone system will be out of service for the duration of the upgrade.
NTAB3603 - BCM 3.6 to 4.0 upgrade
NTAB3686 - BCM 3.7 to 4.0 upgrade
You'll pay about the same whether you upgrade to 4.0 from release 3.6 or 3.7, by the time you factor in what you'll pay for the release 3.7 upgrade auth code.
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