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I talked with my salesman at Switchvox (Digium) as they came out with a new version of Switchvox that has the fax capability. With the new version you can have access to the faxes and the viocemail as an IMAP mailbox. Shoule be easily integrated. I would like to see a phone dialer zimlet that works with Zimbra and Switchvox.
ZCS IMAP and Asterisk appears to have a few troubles I am building a new server at the weekend and will be using Asterisk 1.6 so will see how IMAP behaves. I to wish to have a full voice and mail collaboration
Bugzilla
Wiki
Source
Fax for Asterisk 
I am building a new server at the weekend and will be using Asterisk 1.6 so will see how IMAP behaves. I to wish to have a full voice and mail collaboration 
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