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

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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. 
						

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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. 
						

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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 
						

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In each field, enter the values that fit  your particular network. 
						

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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. 
						

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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. 
						

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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. 
						

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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. 
						

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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. 
						

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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