IMAP voicemail storage support for the Asterisk PBX

 Asterisk is an Open Source PBX and telephony toolkit.
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 This package includes an IMAP-based voicemail storage: storing the
 voicemail in a remote IMAP mail boxes. While more complex to set up,
 it may be useful in some settings.
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 For more information about the Asterisk PBX, have a look at the Asterisk
 package.