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1.4
Voice over IP
The term Voice over IP (VoIP) refers to voice communications over computer
networks based on the Internet protocol (IP). The core idea is to provide the
functions of traditional telephony via cost-effective and wide-spread net-
working structures such as the Internet. VoIP itself is not a standard, rather it
is a collective term for the various technologies (equipment, protocols, voice
encoding, etc.) which make voice communications in IP networks possible.
1.4.1
Example applications
Voice over IP solutions offers advantages across a broad spectrum of applica-
tions, starting with small companies and extending to large corporations with
extensive networks of subsidiaries. In the following section, we will demon-
strate a number of examples.
Supplementing existing ISDN PBXs
VoIP functions can be conveniently added in to existing telephone structures
by using a LANCOM VoIP Router. The LANCOM VoIP Router is simply con-
nected between the public ISDN connection (e.g. ISDN NTBA) and the ISDN
PBX.
VoIP softphone
Analog fax
machines and
telephones
ISDN telephones
Detailed information about configuration is available in the chapter
'Configuration of VoIP functions' or in the LCOS reference manual.
VoIP telephone
ISDN PBX
LANCOM VoIP Router
between NTBA and
PBX
LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 1: Introduction
Public SIP provider
Internet
ISDN NTBA
ISDN
ISDN network
subscribers
15
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