1) Customers can use the Upgrade Basic to Advanced part number to enable IMAP, Cisco Unity Inbox, Speech Recognition, and Text-to-Speech for an individual mailbox. Thats the difference
2) It licenses the phone/user depending on the model
3) Check the OG and validate a quote. You will see ESW/UCSS mapping in DCT
Keep in mind BE5K will not continue to have upgrade versions, BE3K/6K is the platform of choice
Srini
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