Multitech Multivoip 100 Model Mvp120 Voice/fax Over Ip Networks User Guide

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Multi-Tech Systems, Inc. MultiVOIP User GuideBilling Options can be used to track the cost of Inbound and/or Outbound calls on the FXO
interface.  The amount to be charged in cents is entered in the Charge (   ) Cents box together
with the associated time duration in the Per (   ) Seconds box.  While a given call is active, the
accumulated charges can then be viewed on the Call Progress dialog box. When the call ends,
the charges are transferred to a Log File that can be viewed by selecting the call event in the Log
Entries dialog box and selecting Details.
Dynamic Jitter Buffer defines a minimum and a maximum jitter value for voice communications.
When receiving voice packets from a remote MVP120, it is possible to experience varying delays
between packets due to traffic conditions on the network. This is called Jitter. To compensate for
this effect, the MVP120 uses a Dynamic Jitter Buffer. The Jitter Buffer allows the MVP120 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 MVP120 gateways.
The default minimum dynamic jitter buffer of 150 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.
The Optimization Factor determines how quickly the length of the Dynamic Jitter Buffer is
changed based on actual jitter encountered on the network. Selecting the minimum value of 0
means low voice delay is desired, but increases the possibility of jitter induced voice quality
problems. Selecting the maximum value of 12 means highest voice quality under jitter conditions
is desired at the cost of increased voice delay.
The Optimization Factor can be configured in the range of 0 to 12 with a default setting of 7.
Regional Tab
The Regional tab controls the voice communications for the country or region in which the
MVP120 is being used.
From the Country/Region list, select the country or region for which you are configuring the
MVP120. The Tone Pairs group always displays the tones used in the country or region currently
selected. In addition to Australia, Central America, Chile, Europe, France, Japan, UK, and USA,
there is a Custom selection (with defaults identical to USA) . Clicking the Custom button
enables you to edit the Tone Pairs and establish custom sets of tone pairs for Dial Tone, Ring,
and Busy on a Custom Tone Pair Settings dialog box.
The Pulse Generation Ratio group contains two ratios: the 60/40 is for the USA, and the 67/33
ratio is for international applications. 
						

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Changing the Phone Directory Database
The MultiVOIP provides two phone directory database architectures; the propreitary database
and a database using an H.323 protocol gatekeeper that provides a centralized call control
center. The gatekeeper centralized call control center contains the phone directory database
when all VOIP gateways and endpoints support the H.323 protocol. The proprietary database is
based on a master and slave relationship in which the master VOIP maintains the phone
directory database and distributes it to its slave VOIPs.  The centralized call center handles call
control, call routing, address translation from LAN aliases to IP addresses, and bandwidth
management. The H.323 protocol allows other third party gateways and end points that support
the H.323 protocol standards to participate in the VOIP network (e.g., Microsoft NetMetting
®).
The database displays the phone numbers in numerical order with destination details (IP Address
or H323 ID  alias), channel assignment, and a brief description of the entry. The method for
changing the phone directory database is dependent on whether the Gatekeeper option or the
Proprietary Phonebook option is enabled.
If the GateKeeper option is enabled, the RAS Parameters group is enabled and the IP address
of the GateKeeper needs to be enterred in the IP Address window. The Port Number is the port
on the GateKeeper which it communicates with its endpoints. The Q.931 Parameters group is
enabled in both the GateKeeper and Proprietary Phone Book Database architectures. The Use
Fast Start option is used when the VOIP network supports Fast Start capability.
In the GateKeeper phone directory database, the phone directory database is developed through
the Add/Edit Phone Entry dialog box. The Add/Edit Phone Entry dialog box defines the Station
Information, phone number and voice channel of the unit, and station identification, H323 ID /
alias which defines the LAN alias and the IP address of the local unit. In the GateKeeper phone
directory database, only the phone entry of the local unit displays.
If the Proprietary PhoneBook option is enabled, the Database Type group is active which
defines the Master and Slave relationship.  If the database type is master, then the Add, Delete,
Edit, Hunt, and Print buttons at the top of the database dialog box are active. This allows the
master database to build the phone directory.  You can click Slave Status to view the status of
the slave units.
The Add/Edit Phone Entry dialog box for the Proprietary PhoneBook is used to add, delete, and
edit entries.  This information displays in the Phone Directory Database dialog box.
If the database type is set to slave, then the IP address of the master MultiVOIP needs to be
entered in the Master IP Address window, the Send Status Report to Master option can be
enabled, and all the buttons at the top of the directory database dialog box become inactive,
except for the Print button. 
						

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Proprietary Phone Directory Database
In the Proprietary Phone Directory Database, you can add, delete, or edit any entry in the
phone directory database and you can set up Hunt groups that locate another phone number
if the called number is busy. You can print the phone directory database so that you have a
hardcopy of the phone directory.
To add an entry to the Phone Directory database, click Add and the Add/Edit Phone Entry
dialog box displays.
The Add/Edit Phone Entry dialog box contains two groups of information: the Station
Information which contains the phone number, an optional description window, and the
voice channel number. The Station Identification group contains the Hunt Group listing
and the IP Address window for the IP Address of the MultiVOIP assigned the phone number.
The Port number is not used in the proprietary phone book.
The Station Information identifies the calling unit by the phone number and voice channel of
the unit doing the calling. The Phone Number does not have to be a conventional telephone
number. It can be, for example, a three digit number like 101.
The Description is similar to a local telephone book listing. It identifies the calling party. The
voice channel window defines the voice channel associated with the phone number. 
						

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Multi-Tech Systems, Inc. MultiVOIP User GuideThe Station Identification group enables you to assign the entry to a Hunt Group, provide
the IP Address of the MultiVOIP being assigned the phone number, and accept the H.323
industry standard Port number.  A Hunt Group is a series of telephone lines organized in such
a way that if the first line is busy the next line is hunted and so on until a free line is found. It
is a set of links which provides a common resource and which is assigned a single hunt
group designation. A user requesting that designation may then be connected to any member
of the Hunt Group.
You can view the details of the current Hunt Group configuration by clicking the Phone
Directory Database’s Hunt button. The current Phone numbers for HUNT GROUP #1 are
displayed.
Select the Hunt Group you wish to view. The Phone no’s window displays the telephone
numbers associated with that Hunt Group and the No. of Entries field displays the running
total of entries.
Note: You can change the name of the Hunt Group by clicking on the entry that you want to
change, editing the change in the Hunt Group name window, and then clicking the Set button.
Click Slave Status on the Phone Directory Database dialog box to view the status of all the
slave units in your VOIP network (Send Status Report to Master must be enabled on the
Slave).  The Phone Number of each Slave displays with its IP Address, current line status,
and the description of the phone number. 
						

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Gatekeeper Phone Directory Database
With the Gatekeeper Phone Directory Database, the Gatekeeper acts as the central point
for all calls within its zone and provides call control services to registered endpoints. The
Gatekeeper performs address translation from LAN aliases to IP addresses and provides
bandwidth management where the network manager has specified a threshold for the number
of simultaneous calls on the LAN.  The H.323 ID is an alias.  The Gatekeeper may use other
information as an alias such as a URL or an e-mail address.
When the Gatekeeper Phone Directory Database option is enabled, the RAS Parameters
group is enabled with the IP address of the Gatekeeper displayed in the IP Address box.  The
Port Number is the port of the endpoint communicating with the Gatekeeper.  If this number is
changed, it should only be changed with consultation with Gatekeeper administrator.  The port
numbers have to match with the Gatekeeper.
If the H.323 Gatekeeper network supports Q.931 Fast Start servicing, then the Use Fast Start
option on all endpoints should be enabled.  The Call Signalling Port of 1720 is the port on the
MultiVOIP unit supporting the Q.931 parameters.
The Phone Directory Database in a H.323 Gatekeeper network only displays the station
information and station identification of the local unit. The station information and identification
must be entered in conjunction with the Gatekeeper administrator so that the identification of
the endpoint is the same.  To add an entry to the Database, click  Add. The Add/Edit Phone
Entry dialog box displays. 
						

							The Add/Edit Phone Entry dialog box contains two groups of information: 1. Station
Information which contains the phone number, description window which can be left blank,
and the voice channel number. Station Identification group contains the H.323 ID and the IP
Address window for the IP Address of the MultiVOIP assigned the phone number, and the
Port number of the MultiVOIP unit communicating with the Gatekeeper. This port number has
to match the port number pair used by the Gatekeeper. If the port number on either end is
changed, communication between endpoint and the Gatekeeper is lost.
The Station Information identifies the calling unit by the phone number, and voice channel
of the unit doing the calling. The Phone Number does not have to be a conventional
telephone number. It can be a three digit number such as 101. The Description box and the
H323 ID/alias box may contain the same information. It is recommended that the
Description box be left blank and the identifying information be enterred in the H323 ID/alias
window. The voice channel box defines the voice channel associated with the phone number.
The Station Identification group allows you to define the MultiVOIP unit by entering the
H323 ID/alias which can be the same, as for example, your name in your local telephone
book listing. The Gatekeeper associates the H323 ID/alias with the address of the local unit
in the IP Address window. The Port number 1720 is the port of the MultiVOIP communicating
with the Gatekeeper.
The Station Information and Identification of the MultiVOIP unit have to be identical to the
information used by the Gatekeeper in order for the MultiVOIP unit to be registered with the
Gatekeeper. The Gatekeeper can allow an open registration or a secure registration in which
the endpoints are pre-defined by the Gatekeeper. The registration method is determined by
the Gatekeeper administrator and will require communication with each endpoint in order to
develop the H.323 compatible network.
The Phone Directory Database for the local unit holds the local phone numbers, destination
details of the IP address, port number, and channel number of the local unit. The description
is the same as the entry in the H323 ID entry in the Add/Edit Phone Entry dialog box.Chapter 7 - Using the MultiVOIP Software
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Changing IP Parameters
The IP Setup dialog box establishes the IP address for the local Ethernet LAN and defines the
Internet gateway address. The IP Setup dialog box is accessed by clicking IP on the MVP120
Main menu.
With IP Setup dialog box displayed you can change the status of Diffserv, the Ethernet Frame
Type, the IP address and IP Mask of your H.323 endpoint, and the Gateway Address of the IP
address of the device connected to the Internet.
Selecting the Enable Diffserv check box enables Diffserv. Diffserv provides priority to voice
packets so that they are not delayed whenever large data files need to be downloaded. Check
with your systems administrator to determine if any routers in the VOIP network support this
feature. If so, enable this function. 
						

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Multi-Tech Systems, Inc. MultiVOIP User GuideThe Frame Type list enables you to change the Ethernet Frame Type so that it matches your
IP network.  If the current entry does not match your IP network, select the Frame Type from
the Frame Type list. The Frame Type choices are TYPE_II and SNAP.
The Port Address group enables you to change the unique IP Address and IP Mask of the
local LAN.
The Gateway Address group enables you to change the gateway IP Address of the device
connected to the Internet/Intranet.
Viewing Call Progress
The Call Progress dialog box is a read-only screen that displays the status of a call in
progress. This dialog box is accessed from the MVP120 Setup menu by clicking the Call
Progress button.
The ratio of Packets Lost versus Packets Received provides a general indication of the
integrity of the Internet connection. To reduce the frequency of lost packets, select a low-bit-
rate coder, such as, G.723 or Netcoder. In addition, enabling the Forward Error Correction
option on the Voice/Fax tab on the Channel Setup dialog box will enable the MVP120 to
recover many of the lost packets.
The Jitter value (measured in milliseconds) indicates the mean deviation of the difference in
packet spacing at the receiver compared to the sender for a pair of packets. 
						

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Applications Setup
Clicking Others on the Setup menu displays the Applications Setup dialog box. This dialog
box allows you to enable SNMP Agent (the default is disabled) and set up all the necessary
parameters; enable or disable various remote configuration methods such as TFTP (Trivial
File Transfer Protocol) Server, Web Server, Dumb Terminal Management, and Telnet Server;
and assign a Password to the MVP120 for security. These applications enable remote
viewing and changing of the MVP120 configuration, or updating firmware, from anywhere on
the connected network.
Verify that the desired applications are selected.  All applications are selected by default. To
disable a given application, clear its check box.
SNMP related operations can be performed only when the SNMP Agent check box is
selected on this dialog box. The IP address of the system (i.e., SNMP Manager) that will
receive the Traps from the MVP120 should be entered in the IP Address field in the Trap
Manager group. The Community Name of the SNMP Manager receiving the Traps can be a
maximum of 19 characters and is case sensitive. The default Port Number of the SNMP
Manager receiving the Traps is 162. The MVP120 currently supports a maximum of two
community users at a time, and they can be assigned either Read/Write or Read Only rights.
Note: if you have SNMP client software and enable SNMP Agent, you can (in the lower right
corner of the dialog box) choose to read logs through the SNMP Manager instead of the
COM port.
The Password group enables you to enter a password, up to 13 alphanumeric characters, to
be used for security. Once the password is entered and confirmed, remote users will be
queried to enter the password before gaining access to the MVP120 for configuration
purposes.
Note: If you forget your password, contact Technical Support for instructions.
For more information on using these applications, refer to Chapter 5, Remote Configuration
and Management. 
						

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Viewing Statistics
The Statistics dialog box enables you to view statistics for major events of the MVP120
operation. This dialog box is accessed by clicking Statistics on the MVP120 Main menu.
The Voice Channel statistics shows the attempted and completed calls, call duration, average
call length, bytes/packets sent and received. These statistics can be a helpful troubleshooting
tool.
IP Statistics
IP is a connection-less network protocol residing in the network layer of a conventional OSI
layered model (for more information on this model, refer to Appendix A). Depending on what is
going on at the application layer, IP will typically use one of two transport layer protocols. User
Datagram Protocol (UDP), a connection-less transport layer protocol used with TFTP or SNMP;
and Transport Control Protocol (TCP), a connection-oriented transport layer protocol used with
FTP, Telnet, and SNMP.
UDP makes use of the port concept and has no measures for flow control, reliability, or error
recovery. It is used when the full services of TCP are not required, and the reliability measures
must be assumed by another layer.
TCP works well in environments where the reliability measures are not assumed by other layers.
It is connection-oriented and has a full range of services.
These statistics are informational, and their use as a troubleshooting tool will be contingent on
the applications running in the upper layers. For example, if you were having problems