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Multi-Tech Systems Mvp-2400/2410/3010, Mvp-210/410/810 Voice/ip Gateways S000249C User Guide

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    							MultiVOIP User Guide Technical Configuration (Digital)
    101
    The IP Parameters fields are described in the table below.  
    IP Parameter Definitions
    Field Name Values Description
    Enable
    DiffservY/N Diffserv is used for QoS
    (quality of service).
    When enabled, we
    configure the TOS (Type
    of Service) bits in the IP
    header so routers
    supporting Diffserv can
    give priority to the
    VOIP’s IP packets.
    Disabled by default.
    Frame Type Type II, SNAP Must be set to match
    network’s frame type.
    Default is Type II.
    IP Address 4-places, 0-255The unique LAN IP address
    assigned to the MultiVOIP.
    IP Mask 4-places, 0-255 Subnetwork address that
    allows for sharing of IP
    addresses within a LAN.
    Gateway 4-places, 0-255The IP address of the device
    that connects your
    MultiVOIP to the Internet.
    Enable DNS
    Y/N
    (feature not yet
    implemented; for
    future use)Enables Domain Name
    Space/System function
    where computer names
    are resolved using a
    worldwide distributed
    database.
    DNS Server IP
    Address4-places, 0-255.
    (feature not yet
    implemented; for
    future use)IP address of specific
    DNS server to be used to
    resolve Internet
    computer names.
    FTP Server
    EnableY/N
    See “FTP Server
    File Transfers” in
    Operation &
    Maintenance
    chapter.MultiVOIP unit has an
    FTP Server function so
    that firmware and other
    important operating
    software files can be
    transferred to the voip
    via the network. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    102
    7. Enable Web Browser GUI (Optional).  After an IP address for the
    MultiVOIP unit has been established, you can choose to do any further
    configuration of the unit (a) by using the MultiVOIP web browser GUI,
    or (b) by continuing to use the MultiVOIP Windows GUI.  If you want
    to do configuration work using the web browser GUI, you must first
    enable it.  To do so, follow the steps below.
    A.  Set IP address of MultiVOIP unit using the MultiVOIP
    Configuration program (the Windows GUI).
    B.  Save Setup in Windows GUI.
    C. Close Windows GUI.
    D. Install Java program from MultiVOIP product CD (required on
    first use only).
    E. Open web browser.
    F. Browse to IP address of MultiVOIP unit.
    G. If username and password have been established, enter them
    when when prompted.
    H. Use web browser GUI to configure or operate MultiVOIP unit.
    The configuration screens in the web browser GUI will have the same
    content as their counterparts in the Windows GUI; only the graphic
    presentation will be different.
    For more details on enabling the MultiVOIP web GUI, see the “Web
    Browser Interface” section of the Operation & Maintenance chapter of
    this manual. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital)
    103
    8. Set Voice/FAX Parameters.  This dialog box can be reached by
    pulldown menu, toolbar icon, keyboard shortcut, or sidebar.
    Accessing “Voice/FAX Parameters”
    Pulldown Icon
    Shortcut Sidebar
         Ctrl + H 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    104
    In each field, enter the values that fit  your particular network. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital)
    105
    Note that Voice/FAX parameters are applied on a channel-by-channel
    basis.  However, once you have established a set of Voice/FAX
    parameters for a particular channel, you can apply this entire set of
    Voice/FAX parameters to another channel by using the Copy Channel
    button and its dialog box.  To copy a set of Voice/FAX parameters to all
    channels, select “Copy to All” and click Copy. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    106
    The Voice/FAX Parameters fields are described in the tables below.
    Voice/Fax Parameter Definitions
    Field Name Values Description
    Default -- When this button is clicked, all
    Voice/FAX parameters are set to their
    default values.
    Select
    Channel1-24 (T1)
    1-30 (E1)Channel to be configured is selected
    here.
    Copy
    Channel-- Copies the Voice/FAX attributes of
    one channel to another channel.
    Attributes can be copied to multiple
    channels or all channels at once.
    Voice Gain -- Signal amplification (or attenuation)
    in dB.
    Input Gain +31dB
    to
     –31dBModifies audio level entering voice
    channel before it is sent over the
    network to the remote VOIP. The
    default & recommended value is 0 dB.
    Output Gain +31dB
    to
     –31dBModifies audio level being output to
    the device attached to the voice
    channel.  The default and
    recommended value is 0 dB.
    DTMF Parameters
    DTMF Gain -- The DTMF Gain (Dual Tone Multi-
    Frequency) controls the volume level
    of the digital tones sent out for Touch-
    Tone dialing.
    DTMF Gain,
    High Tones+3dB to
    -31dB &
    “mute”Default value:  -4 dB.  Not to be
    changed except under supervision of
    MultiTech’s Technical Support.
    DTMF Gain,
    Low Tones+3dB to
    -31dB &
    “mute”Default value:  -7 dB.  Not to be
    changed except under supervision of
    MultiTech’s Technical Support. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital)
    107
    Voice/Fax Parameter Definitions (cont’d)
    Field Name Values Description
    DTMF Parameters
    Duration
    (DTMF)60 – 3000
    msWhen DTMF: Out of Band is
    selected, this setting determines
    how long each DTMF digit ‘sounds’
    or is held.  Default = 100 ms.
    DTMF
    In/Out of
    BandOut of
    Band, or
    InbandWhen DTMF Out of Band is selected
    (checked), the MultiVOIP detects DTMF
    tones at its input and regenerates them
    at its output.  When DTMF Inband is
    selected, the DTMF digits are passed
    through the MultiVOIP unit as they are
    received.
    FAX Parameters
    Fax Enable Y/N Enables or disables fax capability
    for a particular channel.
    Max Baud
    Rate
    (Fax, bps)2400, 4800,
    7200, 9600,
    12000, 14400
    Set to match baud rate of fax machine
    connected to channel (see Fax machine’s
    user manual). Default = 14400 bps.
    Fax Volume
    Default =
    -9.5 dB-18.5 dB
    to –3.5 dBControls output level of fax tones.  To
    be changed only under the direction of
    Multi-Tech’s Technical Support.
    Jitter Value
    (Fax)Default =
    400 msDefines the inter-arrival packet
    deviation (in milliseconds) for the
    fax transmission. A higher value
    will increase the delay, allowing a
    higher percentage of packets to be
    reassembled.  A lower value will
    decrease the delay allowing fewer
    packets to be reassembled.   
    Mode (Fax) FRF 11;
    T.38
    (T.38 not
    currently
    sup-
    ported)FRF11 is frame-relay FAX standard
    using these coders: G.711, G.728,
    G.729, G.723.1.
    T.38 is an ITU-T standard for
    storing and forwarding FAXes via
    email using X.25 packets.  It uses
    T.30 fax standards and includes
    special provisions to preclude FAX
    timeouts during IP transmissions. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    108
    Voice/Fax Parameter Definitions (cont’d)
    Coder Parameters
    Coder
    Manual or
    Auto-
    maticDetermines whether selection of
    coder is manual or automatic.
    When Automatic is selected, the
    local and remote voice channels will
    negotiate the voice coder to be used
    by selecting the highest bandwidth
    coder supported by both sides
    without exceeding the Max
    Bandwidth setting.  G.723, G.729, or
    G.711 are negotiated.
    Selected
    CoderG.711 a/u
    law 64
    kbps;
    G.726, @
    16/24/32
    /40 kbps;
    G.727, @
    nine bps
    rates;
    G.723.1 @
    5.3 kbps,
    6.3 kbps;
    G.729,
    8kbps;
    Net Coder
    @
    6.4, 7.2, 8,
    8.8, 9.6
    kbpsSelect from a range of coders with
    specific bandwidths. The higher the
    bps rate, the more bandwidth is
    used. The channel that you are
    calling must have the same voice
    coder selected.
    Default = G.723.1 @ 6.3 kbps, as
    required for H.323.  Here 64K of
    digital voice is compressed to 6.3K,
    allowing several simultaneous
    conversations over the same
    bandwidth that would otherwise
    carry only one.
    To make selections from the
    Selected Coder drop-down list, the
    Manual option must be enabled.
    Max
    bandwidth
    (coder)11 – 128
    kbpsThis drop-down list enables you to
    select the maximum bandwidth
    allowed for this channel.  The Max
    Bandwidth drop-down list is
    enabled only if the Coder is set to
    Automatic.
    If coder selected automatically, then
    enter a value for maximum
    bandwidth, as directed by VOIP
    administrator. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital)
    109
    Voice/Fax Parameter Definitions (cont’d)
    Field Name Values Description
    Advanced Features
    Silence
    Compression
    Y/NDetermines whether silence
    compression is enabled (checked) for
    this voice channel.
    With Silence Compression enabled, the
    MultiVOIP will not transmit voice
    packets when silence is detected,
    thereby reducing the amount of
    network bandwidth that is being used
    by the voice channel.
    Default = off.
    Echo
    CancellationY/NDetermines whether echo cancellation is
    enabled (checked) for this voice
    channel.
    Echo Cancellation removes echo and
    improves sound quality.  Default = on.
    Forward
    Error
    CorrectionY/NDetermines whether forward error
    correction is enabled (checked) for this
    voice channel.
    Forward Error Correction enables
    some of the voice packets that were
    corrupted or lost to be recovered. FEC
    adds an additional 50% overhead to the
    total network bandwidth consumed by
    the voice channel.             Default = Off
    Auto Call
    EnableY/NThe Auto Call option enables the local
    MultiVOIP to call a remote MultiVOIP
    without the user having to dial a Phone
    Directory Database number. As soon as
    you access the local MultiVOIP
    voice/fax channel, the MultiVOIP
    immediately connects to the remote
    MultiVOIP identified in the Phone
    Number box of this option.
    Phone No.
    (Auto Call)--Phone number used for Auto Call
    function.  A corresponding phone
    number must be listed in the Outbound
    Phonebook. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    110
    Voice/Fax Parameter Definitions (cont’d)
    Field Name Values Description
    Dynamic Jitter
    Dynamic
    Jitter BufferDynamic Jitter defines a minimum
    and a maximum jitter value for
    voice communications. When
    receiving voice packets from a
    remote 
    MultiVOIP, varying delays
    between packets may occur due to
    network traffic problems. This is
    called Jitter. To compensate, the
    MultiVOIP  uses a Dynamic Jitter
    Buffer.  The Jitter Buffer enables the
    MultiVOIP to wait for delayed voice
    packets by automatically adjusting
    the length of the Jitter Buffer
    between configurable minimum
    and maximum values. An
    Optimization Factor adjustment
    controls how quickly the length of
    the Jitter Buffer is increased when
    jitter increases on the network. The
    length of the jitter buffer directly
    effects the voice delay between
    MultiVOIP gateways.
    The default minimum dynamic
    jitter buffer of 60 milliseconds is the
    minimum delay that would be
    acceptable over a low jitter network.
    The default maximum dynamic
    jitter buffer of 300 milliseconds is
    the maximum delay tolerable over a
    high jitter network.
    Minimum
    Jitter Value60 to 400
    msThe default minimum dynamic
    jitter buffer of 60 milliseconds is the
    minimum delay that would be
    acce
    ptable over a low jitter network.
    Default = 60 msec 
    						
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