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Introduction 15
IntroductionInstallationConfigurationInternet AccessLinking NetworksRemote AccessSending FaxesSecurity Introduction
Voice over IP solutions offers advantages across a broad spectrum of applications, star-
ting with small companies and extending to large corporations with extensive networks of
subsidiaries. In the following section, we will demonstrate a number of examples.
Note Detailed information about configuration is available in the LCOS reference
manual.
Supplementing existing ISDN PBXs
VoIP functions can be conveniently added in to existing telephone structures by using a
Business LAN Router with VoIP option. The Business LAN Router with VoIP option is con-
nected to an ISDN extension line of an ISDN PBX.
Telephone calls over the PBX and its ISDN telephones remain possible just as before; the
telephones remain available under the familiar telephone numbers. This application addi-
tionally offers the following options:
In addition to the ISDN telephones, VoIP telephones or VoIP softphones can be inclu-
ded in the telephone infrastructure. VoIP subscribers in the internal LAN are also able
to call external ISDN subscribers.
The ISDN telephones continue to function, and additionally they can call all of the
internal VoIP telephones and softphones in the LAN.
Calls to external SIP subscribers who use the same Internet provider are often avai-
lable at no cost.
With the appropriate connection to a public SIP provider, any other SIP subscriber
worldwide can be called, irrespective of the provider network. As an alternative to a
direct ISDN connection, ISDN network subscribers can also be reached over a diver-
sion via the SIP provider. The costs depend on the provider's particular tariff models.
ISDN PBX
Business LAN Router with VoIP option
Internet
ISDN
ISDN telephones
VoIP telephoneVoIP sof tphone
ISDN network
subscribers
Public SIP provider
ISDN NTBA
Analog fax
machines and
telephones
15


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