Multitech VoIP Manuel utilisateur

telephony internet access remote access modems

Content

Toll-bypass Long Distance Calling ...................... 1

What Is VOIP? ......................................................... 2

That Was Then...

This is Now...

Immediate Cost Savings ....................................... 3

Applications ........................................................... 3

Office-to-office Communication

Off-net Calling

Create Off-premise Extensions

Replace Expensive Tie Lines

Business Quality Voice .......................................... 4

Bandwidth Requirements .................................... 5

Interoperability ...................................................... 5

VOIP Solutions ........................................................ 5

Routers

VOIP Server Cards

IP-based PBX

PC-based Telephony

IP Gateways

The Multi-Tech VOIP Solution.............................. 7

Easy to Install

Low-risk

Scalable

Easy to Use

Requirements

Models

Try VOIP Now! ......................................................... 8

VOIP Terms .............................................................. 9

Toll-bypass Long Distance Calling

Now multi-location businesses can use the Internet or a

private network (Intranet) for long distance voice and fax

communications and save thousands of dollars annually.

Instead of paying your long distance

carrier to route long distance

calls between offices, any IP

data network can route the

calls using a technology

called Voice over IP

(VOIP). It doesn't

matter if you are

using the Internet, a

private Intranet,

ISDN, DSL, frame

relay, wireless, or

satellite for your data

communications

network, as long as it

uses the Internet Protocol

(IP).

If you make frequent long distance calls to a remote site,

you already know the charges can add up quickly.Voice

over IP is designed to help you maximize the investments

you’ve already made in your data and telecommunications

network infrastructure by bridging them together to

provide toll-free communications.

This guide provides telecommunication managers and

data communications managers with an introduction to

Voice over IP and how they may benefit from voice and

data convergence.

What is VOIP?

VOIP lets you make toll-free long distance voice and fax

calls over existing IP data networks instead of the public

switched telephone network (PSTN).Today businesses that

implement their own VOIP solution can dramatically cut

long distance costs between two or more locations.

That Was Then...

For the past 100 years people have relied on the PSTN for

voice communication. During a call between two

locations, the line is dedicated to the two parties that are

using it. No other information can travel over the line,

although there is often plenty of bandwidth available.

Later, as data communications emerged, companies paid

for separate data lines so their computers could share

information, while voice and fax communications were

still handled by the PSTN.

This Is Now...

Today, with the rapid adoption of IP, we now have a far

reaching, low-cost transport mechanism that can support

both voice and data. A VOIP solution integrates seamlessly

into the data network and operates alongside existing

PBXs, or other phone equipment, to simply extend voice

capabilities to remote locations. The voice traffic

essentially“rides for free” on top of the data network using

the IP infrastructure and hardware already in place.

Immediate Cost Savings

VOIP solutions provide the potential to save substantial

amounts in long distance charges. Businesses with remote

offices worldwide or just in a different area code miles

away can profit from a VOIP solution. Even with the most

inexpensive calling plans, a VOIP network, such as

Multi-Tech’s MultiVOIP gateway solution, can quickly

return your investment and begin paying you back.

In fact, after the one-time investment is paid off, the

VOIP solution begins to create profit for your company.

Applications

Voice over IP is ideal for multi-location businesses looking

to reduce toll charges associated with intra-office calling.

It is designed to help you maximize investments you’ve

already made in your data and voice network

infrastructure. Some examples of the many applications

for a voice over IP network include the following:

Office-to-office Communication

A VOIP network can be as small as two offices or as large

as hundreds of offices. Each office installs and configures

a VOIP solution on their network to begin placing calls or

sending faxes to the other offices on the VOIP network.

Off-net Calling

Telecommuters or customers off the IP network can make

toll-free long distance calls by dialing into a local VOIP

solution and placing calls to any other location on the

VOIP network.You can even have a VOIP solution at a

remote site dial a local phone number for a free person-

to-person long distance call.

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Create Off-premise Extensions

Extend the reach of your PBX into home office locations.

Simply connect a VOIP solution to the PBX at the

corporate office, and another VOIP solution at the remote

office. Now, anyone can place calls to the remote office

by simply dialing an extension number.

Replace Expensive Tie Lines

A company that utilizes tie lines to connect branch office

PBXs to the corporate PBX can now use their own IP-based

Wide Area Network to complete the call.

Business Quality Voice

Independent tests of VOIP systems have shown that they

are perfectly capable of delivering“toll-quality”voice.The

actual voice quality your business will experience,

however, is affected by a number of factors: WAN

bandwidth (the higher the better), voice compression and

network conditions such as latency (average“travel”time

it takes for a packet to pass through the network). On a

private Intranet you can control all of these factors to

achieve near toll-quality voice connections. When using

the public Internet, you can control everything but the

latency factor. Latency, however, can be managed to

enhance your voice quality with a quality of service

guarantee from your ISP.

When network traffic is at peak levels, voice can be given

priority over data to ensure

consistently high voice

quality using the

Differentiated Services

(DiffServ) Quality of Service

(QoS) protocol. Other

features such as forward

error correction, bad frame

interpolation and dynamic

jitter buffers, can further

enhance voice quality.

“We made hundreds of

test calls using the

(MultiVOIP’s) outside

lines, and most people

we called couldn’t tell

that we weren’t on a

standard long distance

line.”

—PC MagazineTest Center

February 9, 1999

Bandwidth Requirements

One common misconception about VOIP is that it is a

bandwidth hog, when, in fact, voice is a very efficient type

of traffic.Voice compression standards like G.729 (8:1)

and G.723 (10:1) are used to minimize the bandwidth

required for voice. G.723, for instance, is the maximum

compression rate and requires only 5.3K bps (plus an

added 7-8K bps for IP overhead). Even at maximum

compression, your VOIP solution will still provide near

toll-quality voice.

As a rule of thumb, 14K bps of bandwidth per call is ideal.

This includes the compressed voice packet and the IP

overhead.To determine total VOIP bandwidth needed per

location, take the number of VOIP channels being used

and multiply by 14K bps. Then double this number to

accommodate for both voice and data traffic.

It should also be noted that bandwidth is used only when

someone is speaking.A silence suppression/Voice

Activation Detection (VAD) feature is an option that frees

unused call bandwidth for data traffic. This is significant,

since callers are usually silent for 60 percent of the call.

Interoperability

Standards are still emerging that ensure VOIP features

work with different vendor solutions. The H.323 standard

is the one most widely deployed and is the only approved

protocol adopted by the International Telecommunications

Union (ITU). The H.323 standard provides support for

audio calls to other H.323 clients, gateways, gatekeepers

and conference servers. Another emerging standard is the

Session Initiation Protocol, or SIP. Look for products that

are adopting these two standards.

VOIP Solutions

From the wide variety of VOIP solutions available today, the

one you select depends on the size of your business, the level

of networking expertise available, the amount of

integration with legacy equipment, and the level of voice

quality you require.

Routers

Router solutions usually replace an existing network

router and keep voice and data all in a single box.

However, this solution requires networking expertise, and

can be costly to install, while placing network services at

risk during deployment and maintenance.

VOIP Server Cards

VOIP server cards can be an economical VOIP solution.

However, they must be compatible with the server and

operating system and installations can be complex.

IP-based PBX

The IP-based PBX is usually software running on a

computer based server. However, it often requires a

forklift upgrade of the existing

PBX, or at a minimum, an

extensive software and/or

hardware upgrade. An IP-based

PBX is typically marketed to

new installations where no

legacy system is in place.

PC-based Telephony

PC-based telephony software is by far the cheapest VOIP

solution, but it is also the clumsiest. It requires users to

make phone calls using their PC instead of a phone. This

usually involves user training and an investment in

speakers and microphones for each PC. Plus,many users

complain that voice quality for this solution is not

adequate for business communications.

IP Gateways

An IP gateway, like Multi-Tech's MultiVOIP, is often the

most suitable VOIP solution for small to midsize

businesses and remote sites. It does not disturb your

existing data infrastructure because it simply drops into

the Ethernet network. Furthermore, it operates alongside

existing PBXs or other phone equipment to extend voice

capabilities to remote locations or users. An IP gateway

requires only a minimal investment in product,

installation, and user training.

Planning a VOIP Implementation

• Encourage data communications managers and

telecommunications managers to work together.

• Choose a solution compatible with existing and planned

systems.

• Ensure that the VOIP product utilizes industry standards

(ITU G.711, G.729, G.723, H.323, SIP, etc.).

• Manage your bandwidth by giving priority to real-time

traffic, like voice and video.

• Keep VOIP calling as easy and seamless as possible by

selecting a product that has calling procedures

similar to your existing phones.

The Multi-Tech VOIP Solution

Multi-Tech's award-winning

MultiVOIP provides an

easy and low-risk way

for your business to

save on long distance

voice and fax costs.

Easy to Install

You don't have to change your PBX, data network, or

Internet/Intranet access to implement the MultiVOIP

solution. There is no

integrating this device

with a PC, a server, or

operating system. And

to simplify installation,

the central site can

preconfigure all units

before sending them to

the remote sites.

Low-risk

MultiVOIP allows you to implement VOIP without

interfering with your network infrastructure or phone

system. If there are problems with the VOIP installation or

the IP network goes down, you can still pick up your phone

and use the PSTN to place a long distance call.

Scalable

The MultiVOIP design allows you to expand VOIP support

as needed. Add more VOIP ports at a busy site with

another MultiVOIP.Add another office to your VOIP

network by installing a MultiVOIP at that office.

Easy to Use

Placing calls with MultiVOIP is like using your existing

phone system. No end-user training is required.

MultiVOIP:

• eliminates toll charges

between offices

• requires no changes to

phone or network

systems

• installs in minutes

• easy to use

Requirements

You probably already have what you need to deploy a

MultiVOIP network and start saving on long distance calls.

To determine the number of ports that you need, first

determine what percentage of the long distance bill is used

for intra-office communication (typically between 25-

40%), then multiply the percentage by the number of lines

at the location. If you are using tie lines, for every line

that you support, you will need one port on the MultiVOIP.

MultiVOIP Models

To learn more about the MultiVOIP family visit our web

site at www.multitech.com/products/multivoip.

Try VOIP Now!

You be the judge! Call our toll-free demo (in the USA)

1-877-TRYVOIP and hear for yourself how clear

the connection can be.

MultiVOIP Site Requirements

❏

Ethernet LAN

❏

IP network

❏

IP addresses

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