The VMP uses a flash drive for storage. There is also a hard drive version that has 200 hrs of storage. I would splurge & go for the CTI(add $1500) version & get your voice mails & faxes(add $1000) to appear in outlook like an email. Whisper back is great, the only drawback for some users I find, is that when you call a station internally & it is offhook, you get a busy signal, then to go to the mailbox you press 7, whisper back 6, plus others. This confuses new uses in large applications.

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Bound to cover,
just a little more ground.