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IP Office Product Description

IP Office 4.2

Page 128

Issue 18.b.- (08 July 2008)

5. IP Telephony

Technological innovation is changing the way we communicate. This time it is coming in the form of changing

the way telephone calls are transmitted. It brings with it several new capabilities that change the meaning of

the phrase telephone call through the use of Voice over Internet Protocol (VoIP). Basically, VoIP means “voice

transmitted over a packet data network.” VoIP is often referred to as IP Telephony because it uses the IP

protocols to make possible enhanced voice communications throughout the world, wherever IP connections

have been delivered. IP Telephony unites a company’s many locations—including mobile workers— into a

single converged communications network. Telephony calls using VoIP go above and beyond what’s been

possible in the past. When it comes to placing telephone calls, VoIP provides a range of support services and

features unequalled in the world of telephony, but above all deliver them at low cost.

How Does VoIP Work?

Voice over Internet Protocol means basically what the acronym states: Voice travels over an Internet Protocol.

Internet Protocol refers to the type of rules that the network uses to send and receive signals. IP Telephony

works by converting voice communications into data packets. Conveniently, it runs on the popular Ethernet

LAN (local area network) technology, which currently supports over 96 percent of the worlds companies’ LANs.

Circuit-switched or Time-Division Multiplexed Telephony

Before digital networking with the Internet took off, everyone had to use the “Plain Old Telephone

Services” (POTS). These run over a network called the Public Switched Telephone Network (PSTN). The PSTN

has been around since the telephone was invented in either analog or digital form using circuit switched

technology where the telephone call gets exclusive bi-directional use of a wire – or circuit – while the call is in

progress. Because the circuit is exclusive to each conversation, PSTN and private branch exchanges (PBXs)

must be sized to cope with peak demand and have enough circuits available for all expected conversations.

This is not a flexible approach and results in a lot of infrastructure investment that the telephone companies

need to recoup, via the cost of access charges and calls. The Internet has changed this – where data services

have driven down access charges and allowed voice to “travel for free” over a multipurpose data network.

Packet-Switched Telephony

Unlike circuit-switched connections, which always require use of dedicated bi-directional circuit for the duration

of a call, VoIP technology has enabled telephony and other new and novel features and services to run over

fixed and wireless networks including private local area networks. These newer network types use packet-

switched protocols. Packet-switched VoIP puts voice signals into packets. Along with the voice signals, VoIP

packets include both the sender’s and receiver’s network addresses. VoIP packets can traverse any VoIP-

compatible network. Along the way, they can choose alternate, shared paths because the destination address

is included in the packet. The routing of the packets is not dependent on any particular network route which

means the network provides can provide a reliable service at a fraction of the cost of circuit switched

providers.

What Advantage Does IP Office Have?

IP Office can provide support of PSTN, POTs, digital time division multiplexed phones AND digital IP phones all

on the same system. This means you don’t have to abandon the past to embrace the future, IP Office allows

all the technologies to co-exist. IP Office connects to the PSTN and to IP trunks (the VoIP equivalent) so

providing a “Hybrid” PBX function – where both legacy and future technologies can be used together to

minimize operating costs and offer optimize business communications through both voice and data.

IP Office has digital telephones built on both TDM and IP technology that provide the same user interface

offering a flexible choice of solution that can mix, for example TDM phones in the office and IP phones at a

remote site of at home. With the choice of IP phones including real and virtual (software) phones, IP Office can

take communications to a new level.

Buying IP Office allows you choice – you can use the pure POTs or the pure VoIP capabilities of IP Office, or

use both at the same time to allow seamless technology transition of your business without the disruption of

having to choose between them now.

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