Yeah we also use dummy users for this purpose, in the Architect flow just select Route to Voicemail and it allows you to select an individual user. That "user" will receive the VM as an email - so just make that user's email the address you want to use.
The only thing to remember is that the default user voicemail greeting plays and if you want to re-record it, as far as I know, you have to log in as that user as use the normal voicemail greeting recording process.
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James Dunn
Pitney Bowes Inc.
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