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    Copyright
    Dedication
    Foreword
    Preface
    Ch. 1. A Telephony Revolution
    Ch. 2. Preparing a System for Asterisk
    Ch. 3. Installing Asterisk
    Ch. 4. Initial Configuration of Asterisk
    Ch. 5. Dialplan Basics
    Ch. 6. More Dialplan Concepts
    Ch. 7. Understanding Telephony
    Ch. 8. Protocols for VoIP
    Ch. 9. The Asterisk Gateway Interface (AGI)
    Ch. 10. Asterisk Manager Interface (AMI) and Adhearsion
    Ch. 11. The Asterisk GUI Framework
    Ch. 12. Relational Database Integration
    Ch. 13. Managing Your Asterisk System
    Ch. 14. Potpourri
    Ch. 15. Asterisk: The Future of Telephony
    Appx. A. VoIP Channels
    Appx. B. Application Reference
    AddQueueMember()
    ADSIProg()
    AgentCallbackLogin()
    AgentLogin()
    AgentMonitorOutgoing()
    AGI()
    AlarmReceiver()
    AMD()
    Answer()
    AppendCDRUserField()
    Authenticate()
    Background()
    BackgroundDetect()
    Busy()
    ChangeMonitor()
    ChanIsAvail()
    ChannelRedirect()
    ChanSpy()
    Congestion()
    ContinueWhile()
    ControlPlayback()
    DateTime()
    DBdel()
    DBdeltree()
    DeadAGI()
    Dial()
    Dictate()
    Directory()
    DISA()
    DumpChan()
    EAGI()
    Echo()
    EndWhile()
    Exec()
    ExecIf()
    ExitWhile()
    ExtenSpy()
    ExternalIVR()
    FastAGI()
    Festival()
    Flash()
    FollowMe()
    ForkCDR()
    GetCPEID()
    Gosub()
    GosubIf()
    Goto()
    GotoIf()
    GotoIfTime()
    Hangup()
    HasNewVoicemail()
    HasVoicemail()
    IAX2Provision()
    ICES()
    ImportVar()
    Log()
    LookupBlacklist()
    LookupCIDName()
    Macro()
    MacroExclusive()
    MacroExit()
    MacroIf()
    MailboxExists()
    MeetMe()
    MeetMeAdmin()
    MeetMeCount()
    Milliwatt()
    MixMonitor()
    Monitor()
    MorseCode()
    MP3Player()
    MusicOnHold()
    NBScat()
    NoCDR()
    NoOp()
    Page()
    Park()
    ParkAndAnnounce()
    ParkedCall()
    PauseMonitor()
    PauseQueueMember()
    Pickup()
    Playback()
    Playtones()
    PrivacyManager()
    Progress()
    Queue()
    QueueLog()
    Random()
    Read()
    ReadFile()
    RealTime
    RealTimeUpdate()
    Record()
    RemoveQueueMember()
    ResetCDR()
    RetryDial()
    Return()
    Ringing()
    SayAlpha()
    SayDigits()
    SayNumber()
    SayPhonetic()
    SayUnixTime()
    SendDTMF()
    SendImage()
    SendText()
    SendURL()
    Set()
    SetAMAFlags()
    SetCallerID()
    SetCallerPres()
    SetCDRUserField()
    SetGlobalVar()
    SetMusicOnHold()
    SetTransferCapability()
    SIPAddHeader()
    SIPDtmfMode()
    SLAStation()
    SLATrunk()
    SoftHangup()
    StackPop()
    StartMusicOnHold()
    StopMixMonitor()
    StopMonitor()
    StopPlaytones()
    StopMusicOnHold()
    System()
    Transfer()
    TryExec()
    TrySystem()
    UnpauseMonitor()
    UnpauseQueueMember()
    UserEvent()
    Verbose()
    VMAuthenticate()
    VoiceMail()
    VoiceMailMain()
    Wait()
    WaitExten()
    WaitForRing()
    WaitForSilence()
    WaitMusicOnHold()
    While()
    Zapateller()
    ZapBarge()
    ZapRAS()
    ZapScan()
    Appx. C. AGI Reference
    Appx. D. Configuration Files
    Appx. E. Asterisk Dialplan Functions
    Appx. F. Asterisk Manager Interface Actions
    Appx. G. An Example of func_odbc
    Colophon
    Index
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    HasVoicemail()

    HasVoicemail()Indicates whether there is voicemail in the indicated voicemail box
    HasVoicemail(vmbox[@context][:folder][|varname[,options]])


      

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