Black Box AVSP-DVI1X8 Información técnica descargar pdf (Pagina 70)

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VoIP, Overview

Overview

VoIP

These days, the question isn’t if you should move to a VoIP system, but when.

Although VoIP systems have been commonplace in larger organizations,

they are now becoming more affordable and practical for small- to medium-

sized businesses (SMBs) to implement. VoIP systems beneﬁt everyone from

telecommuters to the managers and users of large call centers.

oving towards VoIP.

More and more companies are migrating

from a traditional private branch exchange

(PBX) telephony system to a voice-over-IP

(VoIP) system. These converged networks

take advantage of IP communications to

better manage and transmit voice, data,

images, video, e -mail, faxes, and more.

What is VoIP?

A cost-saving alternative to traditional

telephony service, VoIP delivers voice calls

over a data network that uses packet

switching instead of circuit switching.

There are different types of VoIP

networks. Calls can be “Internet telephony,”

that is, sent over the public Internet, or

“enterprise IP,” which are calls originating

on the corporate IP network and sent over

the corporate intranet, or a combination of

the intranet and a Public Switched Network

(PTSN). The latter is called an IP PBX system.

VoIP options.

The best VoIP option for you depends on

the size of your organization, the number

of users, how many locations you have,

etc. There are two basic types of offerings:

hosted services or on-premises services, also

called customer premise equipment (CPE)

services.

Large organizations typically use CPE

systems where the equipment is physically

on-site. These offer much greater control

over features and capabilities, but they also

require a much greater initial capital outlay.

Small businesses usually use hosted services

as they’re easier to manage and have a

much smaller initial capital expenditure.

VoIP offerings include:

Converged voice/data. There are basic

VoIP systems using existing phone systems.

The most basic are software-based, such as

Skype

. As software-based systems continue

to grow and mature, they are becoming

more appealing to the SMB market.

Hosted IP PBX. In a hosted system, the

service provider, rather than the end user,

deploys a PBX system. The end user needs

to purchase IP phones, but not a PBX.

Managed IP PBX. This is an on-site

VoIP system including the system, services,

and support. It requires a greater capital

expenditure but it gives the user a ﬂexible

call routing platform, management of PBX

functions, and centralized call routing.

Session Initiation Protocol (SIP)

trunks. A much newer technology, SIP

trunks enable converged IP applications

within and outside the enterprise. SIP

trunks offer signiﬁcant savings, eliminating

the need for local PSTN gateways. They

also offer maximum control of multimedia

communication sessions over an IP network.

VoIP considerations.

VoIP depends on having a fast, reliable

network to operate. A fast connection with

guaranteed bandwidth is not a problem

in a corporate intranet. But if you’re using

the Internet for VoIP, you’re using a public

network that may be subject to slowdowns.

The quality of your connection may be

unacceptable when Web usage is high.

You may face many of the same

challenges experienced with sending high-

resolution video over a LAN, especially if it’s

a converged voice/video/data application.

Therefore, you’ll need to test the speed of

connections and the network for available

bandwidth, and have the ability to prioritize

switched packets for QoS delivery.

Other common issues with a VoIP system

have to do with latency (resulting in people

speaking over one another), transmission

loss, jitter (common to congested networks

with bursty trafﬁc), and sequence errors,

or changes in the order of packets at the

receiving end that degrades sound quality.

For help setting up a problem-free

VoIP system, talk to Black Box today.

724-746-5500

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