Virtual Private Network (Vpn) Tunnelling - NEC Univerge SV9100 Manual

4.3
5-8
Applications
PC Programming
DHCP Server
SIP MLT Listening Port
SIP Trunk Listening Port
SIP Single Line Stations
Realtime Transport Protocol
Realtime Transport Control
Protocol (RTCP)

Virtual Private Network (VPN) Tunnelling

A Virtual Private Network is a private data network that maintains privacy through
using a tunneling protocol and security procedures. Allowing for remote networks
(including VoIP devices), which reside behind NATs and/or Firewalls to
communicate freely with each other. In UNIVERGE SV9100 VoIP networks,
implementation of VPNs can resolve the issues with NAT that are described in the
previous section.
The idea of the VPN is to connect multiple networks together using public (i.e.,
Internet) based connections. This type of connection is ideal for those commuters,
home workers, or small branch offices needing connectivity into the corporate
backbone. It is possible to connect these remote networks together using private
links (such as leased lines, ISDN, etc.) but this can be very expensive and there is
now a high demand for low cost Internet connectivity.
Companies today are exploring the use of VPN for a variety of connectivity
solutions, such as:
Remote User to Corporate Site VPN

Allows employees to use their local ISP fastest connection such as cable
modems, DSL, and ISDN. For traveling users, all they need to do is dial into
their ISP local phone number.
Site-to-site VPN

Allows companies to make use of the Internet for the branch-to-branch
connections, cutting the cost of the expensive point to point leased line service.
Extranet

Extranet describes one application using VPN technology. The concept allows a
company and a vendor/supplier to access network resources at each site. For
example, a customer may have access to a suppliers intranet for access to
product information.
UNIVERGE SV9100
Rx Port
Programming
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Network Design Considerations
Issue 2.0
10-46-06
10-29-04
84-20-01
84-26-02
84-26-03