Voice Office Application Suite Configuration GuideChapter 5 Visual Voicemail ConfigurationConfiguring Nortel Messaging63The Application Gateway supports 32 concurrent audio streams. A userlistening to a Visual Voicemail message occupies one audio stream. (Amessage broadcast from Broadcast Server also occupies one audio stream.)Configuring Nortel MessagingVisual Voicemail operation requires the following Nortel Messagingconfiguration:• Visual Voicemail operation with a particular mailbox requires thatyou enable the Desktop and Web Messaging mailbox feature inNortel Messaging Manager (User > Mailbox Classes > Mailbox ClassDetails, under Keycoded Features). A user’s Mailbox Class of Servicemust be selected as a Desktop Messaging user.A Nortel keycode is required to provide a mailbox access to thatUnified Messaging feature. You obtain keycodes from Nortel via anauthorized distribution partner.• Visual Voicemail operation with a particular mailbox requires that theuser has already created a mailbox password.• Visual Voicemail operation with Nortel Messaging requires that youconfigure Nortel Messaging to use IMAP for Internet mail clients. InMessaging > Internet Mail Clients, select Enable IMAP and EnableIMAP with Plain Password Authentication.• The Application Gateway supports 8-bit G.711 Mu-Law audioCODECs and converts some audio, including the VBK, into G.711. Youcan configure Nortel Messaging to use G.711 format.Note If phone users can see Visual Voicemail messages but cannot hear audiowhen a message plays, verify that the above requirements are met.