Upgrade licenses are available in eDelivery (Cisco Recommended, but only available for direct upgrades, i.e. from 7.0 or later) or traditional physical delivery (all upgrades). They are described in sections 4.7.5.1.1 and 4.7.5.2 respectively.All upgrades must be ordered using the Product ID that specifies the release FROM which the customer is upgrading. It is important to order the correct product code, or else the upgrade license key will not work. PLEASE NOTE: Upgrade PAKs cannot be provided for any release 3.x customer. As a result, customers upgrading from a 3.x release, must open a case with licensing@cisco.com. Customers will need to provide entitlement details (e.g. SO#, PAK or existing license files) of the original 3.x system. Customers who are not able to provide either of these details should mail the request to ipcc-express-pm@cisco.com, providing as much information about the original order as possible, e.g. time frame of order, customer/partner name, number of licenses ordered, etc., so that the original order details can be researched.Any release 4.0 or later customer does not have to open a case and the appropriate licenses will be provided in the order.