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Lancom Business LAN R800 plus Manual

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16 Introduction
Frequently, long-distance and overseas calls via an SIP provider are significantly che-
aper than the traditional telephone connection.
In this constellation, the Business LAN Router with VoIP option takes over the switching of
the calls. The device can be individually configured, for example, to use the access codes
to decide upon the switching of a call either via the ISDN interface, or via the Internet as a
VoIP call.
Note The extent of integration into the existing telephony infrastructure depends
on the possibilities available with the existing ISDN PBX. Certain systems
can handle calls over special lines by mapping and forwarding them to
extension lines. For further information, please consult the documentation
for your ISDN PBX.
Connecting subsidiaries or home offices to the headquarters
Many subsidiaries or home offices already have a connection to the network at headquar-
ters over VPN. These connections are normally limited to conventional data transmission.
By using VoIP, internal company calls can be made for free over the existing VPN connec-
tion and—thanks to the VPN encryption—these calls are secured against eavesdropping.
With a Business LAN Router with VoIP option located in the branch or home office, the
two worlds of traditional and VoIP telephony can be united in a single telephone: A VoIP
telephone or an existing analog telephone with ATA ("Analog Telephone Adpater") can be
used for free telephone calls via VPN to the headquarters, or to make standard calls via
ISDN.
The advantages of a telephone connection to headquarters:
Business LAN Router
with VoIP option
Internet
ISDN
VoIP telephone
VoIP PBX connected to the
ISDN network
VPN tunnel
VoIP telephones
Business
LAN R800+
Analog telephone
with ATA
Branch office Headquarters
… 16 …


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