Multitech VoIP User's Guide download pdf (Page 9)

The MultiVOIP Gateway

The MultiVOIP family of Voice over IP gateways is available in analog and digital models ranging from

one to 60 ports. MultiVOIP gateways connect directly to phones, fax machines, key systems, or a PBX

and plug into the data network to provide real-time, toll-quality voice connections to any of ce on

your VOIP network. With MultiVOIP, your customers will avoid

the hassle and expense of replacing their existing routers, WAN

connections or phone systems required by other VOIP solutions.

It supports industry-standard protocols to ensure optimum

interoperability and voice quality. And, users are not required

to master new operating procedures. In fact, once con gured,

a MultiVOIP network can be used immediately and companies

can start saving money.

In our company example, the following diagram maps out their converged network using MultiVOIP

Voice over IP gateways.

How Does it Work?

Because VOIP gateways are point-to-point solutions, they  rst need to establish the call setup.

This process requires the caller to access the local MultiVOIP gateway and then dial a telephone

number/extension to reach the remote MultiVOIP gateway. A

call processing technique maps this dialed number into an IP

address for delivery to the remote VOIP gateway.

Next, in order to merge the voice call onto the IP data network,

it must be encapsulated into an IP packet. To encapsulate voice,

the call is broken up into frames. The size of the frame is de ned

by the voice compression used (see bandwidth requirements on

pg. 8 for more details on voice compression).

Then, several frames of voice data are collected. A protocol

header is added to the beginning of the voice data to indicate the

destination address and data type. Finally, the packet is queued

for transmission. This entire process of voice packetization takes

only 10 to 20 milliseconds (ms), making it undetectable to the

human ear.

Converged Network

How a VOIP Network Works

Phone Equipment:

•

Uses standard dialing to make a call

•

Routes the call to a channel on the

VOIP gateway

VOIP Gateway:

•

Establishes call setup

•

Packetizes voice and telephone

signaling

•

Applies audio compression

Router:

•

Routes packets over the Internet/

intranet to the remote of ce VOIP

gateway

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Multitech VoIP User's Guide Page 9

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