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Content
Introduction
Voice over IP for Multi-Location Businesses
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Voice over IP
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Voice over IP Gateways
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Voice over IP Frequently Asked Questions
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Voice Quality
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Voice over IP Applications
Advanced Feature Con guration
VOIP Glossary of Terms
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Voice over IP Primer
Voice over the Internet Protocol (VOIP) is one of the hottest topics for multi-location businesses of any
With MultiVOIP, a small investment will pay for itself within the rst six months to one year and then
we have three locations that utilize a MultiVOIP solution: Minneapolis-corporate, Los Angeles-branch
While VOIP is a compelling technology for a business to embrace, the challenge is in bringing together
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Voice over IP Return on Investment
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known as POTs (Plain Old Telephone Service), for voice communication. Although it is very reliable,
A PBX was originally designed to save the cost of requiring a line for each user to the telephone
A limitation to the traditional PBX is that it is a location-centric platform. The networking options to
button) to access the tie line and then dial the remote of ce extension. Tie lines, however, are expensive
because they add extra monthly phone charges. And, the telecommunications manager may be faced
be networked together.
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Another option is to provide the remote of ce with a key telephone system. A key system is a lower
The Challenge - Limited Networking Solutions
With limited networking solutions, remote of ce workers often feel handicapped by the dif culty of
with creating more ef cient and cost-effective voice communications in an environment that wasn’t
The Internet Protocol
An IP data network is a highly distributed networking environment in which clients access information
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A router is an advanced networking component that determines the route that IP packets of data will
volumes of data from clogging the connection.
We can classify IP data network technologies as belonging to one of two basic groups: Local Area
bandwidth comparison of various WAN connection types.
WAN Connection Types
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wherever their of ces are.
As the popularity of the Internet grew, businesses turned to it as a means of extending their
The Opportunity - Unprecedented Connectivity Options
data. Having a universal language that
virtually all worldwide networks can understand has opened up unprecedented connectivity options
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Voice over IP
Voice over IP uses the data network packet-switching method to provide a more ef cient way of sending
voice communication. Packet-switching optimizes the use of network resources (bandwidth) because
balance the load across various pieces of equipment. This allows several telephone calls to occupy the
Voice over IP Gateways
Voice/Fax “Ride Free” on the Data Network
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The MultiVOIP Gateway
your VOIP network. With MultiVOIP, your customers will avoid
Voice over IP gateways.
by the voice compression used (see bandwidth requirements on
header is added to the beginning of the voice data to indicate the
human ear.
Applies audio compression
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Voice over IP Frequently Asked Questions
voice compression standards which range from G.723 (5.3K bps/6.3K bps) to G.729 (8K bps) to G.711
by-of ce or user-by-user basis. With MultiVOIP, the majority of applications are optimally con gured
As a rule of thumb, 14K bps of bandwidth per call is ideal. This includes the compressed voice packet
bandwidth for data traf c. This is signi cant, since callers are usually silent for 60 percent of the call.
Voice Quality
voice. Earlier implementations were criticized for excessive noise and other quality of service issues.
voice compression (as discussed previously) and network conditions including latency, jitter and packet
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is de ned as the average “travel” time it takes for a packet to pass through the network, from
Another way to enforce Quality of Service is to use the Resource Reservation Setup Protocol (RSVP).
When running Voice over IP on the public
before it reaches its destination. However,
Jitter
is de ned as the variability in packet arrival at the destination. Voice packets must compete
with non real-time data traf c, therefore, if there are bursts of traf c on the network, they can result
Up to 150 ms = excellent
150 - 250 ms = good
250 - 350 ms = usually acceptable
> 350 ms = depends on application
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At the application level, standards for Voice over IP interoperability are still evolving. The H.323
Another emerging standard, developed by the Internet Engineering Task Force (IETF), is the Session
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Yes, as long as the PBX has analog extension ports, CO ports, E&M ports, or T1/E1/PRI cards available, or
Yes, MultiVOIP supports H.450 supplementary services to provide for call transfer, call forwarding, call
hold, call waiting, and name identi cation. It also supports Q.SIG, an inter-PBX signaling protocol, for
Yes, the MultiVOIP gateway is easily managed locally using a windows-based software application
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You do not need a port for every telephone on the PBX system. You simply need to determine the calling
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Voice over IP Applications
A VOIP network can be as small as two of ces or as large as hundreds of of ces. Each of ce installs
VOIP network without incurring long distance charges. In our company example, we have now added
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Wireless Building-to-Building
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* MVP130 supports FXS and FXO only.
You will note that with a key telephone system and a PBX, you have a couple of interface options. The
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Use this interface when connecting the line side (CO port) of your key telephone
The caller needs to access the MultiVOIP gateway in order to receive a dial tone.
An easy approach would be to associate a button on the phone system that will access the
MultiVOIP will generate the ring signal, just like an outside CO line. At this
Use this interface when connecting the station side (extension port) of your
The caller will need to access the extension in order to receive a dial tone from
The MultiVOIP gateway will utilize an extension on the phone system. At this
E&M is the preferred interface, on a PBX system, because it provides the most
All channels on the MultiVOIP gateway do not have to be con gured the same way. For example, one
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A more sophisticated phonebook setup can be created that requires an “intelligent” PBX and the
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When con guring the MultiVOIP gateway
Advanced Feature Con guration
voice quality. Our recommendation is to use the factory defaults. Most users nd these are more than
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At Multi-Tech, we believe our resellers are truly an extension of our sales force. Therefore, we’ve put
unlimited access to our Inside Sales Specialists, your rst line of support
an invitation to our traveling roadshow seminar series in which you’ll
offered monthly, these special promotions are designed to help you pro t
by selling more Multi-Tech solutions.
You’ll be eligible to purchase “not-for-resale” (NFR) demo equipment.
Our business is about communication so we believe that keeping you
customize promotional direct mail, faxblasts, and e-mail blasts with
your logo and contact information. These marketing materials, available free of charge, are
www.multitech.com/PROGRAMS/Opt_App.asp
Voice over IP Technology Guide (#86000461) - an introduction to Voice over IP.
Technical Support
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Warranty and Overnight Replacement Service
* For U.S. customers only.
We hope you found that this primer addressed your basic questions regarding Voice over IP and
your business and give you a competitive advantage. But don’t take our word for it, you be the judge.
and bring convergence to your customers today.
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VOIP Glossary of Terms
Interpolates lost/corrupted packets by using the previously received voice frames. It
The transmission capacity of a communications line. It is a factor in determining the amount of
A unit to measure the speed at which data bits can be transmitted or received.
The lowest, or most basic level of switching in the PSTN network. A business PBX or any
A technology used by the PSTN that allocates a pair of conductors for the exclusive use
Coder-decoder compression scheme or technique. In Voice over IP, it speci es the voice coder rate of speech
Used at anywhere from 1:1 to 12:1 ratios in VOIP applications to consume less bandwidth and leave
Is a quality of service protocol that prioritizes IP voice traf c to help preserve
voice quality even when network traf c is heavy.
A technology that allows a provider to use the excess bandwidth found in a copper
line for the provision of data services. Its maximum download speed is 1.5M bps.
The interface on a VOIP device that allows it to be connected to analog PBX trunk ports (tie
lines).
The elimination of an echo in a two-way transmisison.
A 10-megabit/100-megabit baseband local area network that allows multiple stations to access the
Increases voice quality by recovering lost or corrupted packets.
A group of data bits in a speci c format to help network equipment recognize what the bits mean and how
A fast-packet data communications standard that allows a network to carry data frames in packets
The interface on a VOIP device for connecting to an analog PBX extension.
The interface on a VOIP device for connecting directly to phones, fax machines, and
An industry-standard call setup protocol designed to standardize VOIP communications between other
A civil international organization established to promote
Refers to the computer network of many millions of university, government and private users around the
world. Each user has a unique Internet address (IP address).
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A protocol used to route data from its source to its destination in an Internet environment. It
A 32-bit address used by IP data networks to uniquely identify the location of a
A network device that converts voice and fax calls, in real time, between the PSTN and an IP network.
An H.323 entity that de nes the policies that govern the multimedia system (e.g. dialing plans, user
billing or other purposes.
Provides a digital telephone service which allows both data and voice
Jitter -
The variability in packet arrival at the destination. When consecutive voice packets arrive at irregular
Phone devices with multiple buttons that let you select incoming or outgoing CO
Two or more computers linked together in a contained location; such as an of ce
building, allowing users to share les and access to printers.
Average “travel” time it takes for a packet to pass through a network. The lower the latency, the better the
voice quality.
Dedicated common-carrier facilities and channel equipment used by a network to furnish exclusive
A sequence of binary digits, including data and control signals, that is transmitted and switched as a
A method of transferring information in which data is broken into small pieces, called
A phone exchange located on the customer’s premises. The PBX provides a circuit
The basic analog phone service consisting of standard telephones, telephone
lines, and access to the public switched network.
The public switched telephone network that traditionally routes voice calls from one location to another.
Refers to the measure of service quality provided to the user.
A device that connects two networks using the same networking protocol.
In Voice over IP, silence suppression/voice activation detection
A signaling protocol for setting up conferencing, telephony, multimedia and other
The TCP/IP standard protocol that is used to manage and control
An IP address that is permanently assigned to a network device by an ISP.
A mask used to determine what subnet an IP address belongs to.
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Telnet -
The TCP/IP standard network virtual terminal protocol that is used for remote terminal connection service
A high-speed (1.544M bps) digital telephone line with the equivalent of 24 individual 64K bps channels time
Tie Line -
A dedicated circuit linking two points without having to dial a phone number (i.e. the line may be accessed
by lifting the phone handset or by pushing a button).
Trunk -
Service that allows quasi-transparent connections between two PBXs, a PBX and a local extension, or some
Vocoder (voice encoder/decoder) -
Provides multiple voice compression standards which range from G.723 (5.3K
bps) to G.711 (full, uncompressed 64K bps). These standards are used to minimize the bandwidth required for
voice.
VOIP (Voice over Internet Protocol) -
The technology that turns voice conversations into data packets and sends
VPN (Virtual Private Network) -
A private network that utilizes dedicated equipment and large-scale encryption to
WAN (Wide Area Network) -
The result of the connection of two or more LANs.
Trademarks:
MultiVOIP, MultiVOIPManager, MultiVOIP Gatekeeper, Multi-Tech, and the Multi-Tech logo: Multi-Tech Systems, Inc.
All other products or technologies are the trademarks or registered trademarks of their respective holders.
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State/Prov.:
Country:
No. of remote locations
A.
2 ports)
4 ports)
8 ports)
16 ports)
Voice Bandwidth: (line D x 14K)
State/Prov.:
Country:
A.
2 ports)
4 ports)
8 ports)
16 ports)
Voice Bandwidth: (line D x 14K)
State/Prov.:
Country:
A.
2 ports)
4 ports)
8 ports)
16 ports)
Voice Bandwidth: (line D x 14K)
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State/Prov.:
Country:
A.
2 ports)
4 ports)
8 ports)
16 ports)
Voice Bandwidth: (line D x 14K)
State/Prov.:
Country:
A.
2 ports)
4 ports)
8 ports)
16 ports)
Voice Bandwidth: (line D x 14K)
State/Prov.:
Country:
A.
2 ports)
4 ports)
8 ports)
16 ports)
Voice Bandwidth: (line D x 14K)
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