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Administrator's Guide

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Chapter 1. Introduction to 3Com VCX
IP Telecommuting Module
Some of the functions of 3Com VCX IP Telecommuting Module are:
• SIP proxy: Forwarding of SIP requests.
• SIP registrar: Registration of SIP users.
• Protection against such attacks as address spoofing.
• Logging/alarm locally on the Telecommuting Module, via email and/or via syslog.
• Managing several logical/directly-connected networks and several network connec-
tions/physical networks.
• Administration of the Telecommuting Module through a web browser using http or https.
• QoS - bandwidth limitation and traffic prioritizing (using the QoS module).
• Failover - connect two Telecommuting Modules in parallel; one handles traffic and the
other acts as a hot standby.
• STUN server and Remote SIP Connectivity for SIP clients behind NAT boxes which are
not SIP aware (using the Remote SIP Connectivity module).
Note that some of the functions mentioned here are only available if the corresponding ex-
tension module has been installed.
What is a Telecommuting Module?
A Telecommuting Module is a device which processes traffic under the SIP protocol (see
RFC 3261). The Telecommuting Module receives SIP requests, processes them according to
the rules you have set up, and forwards them to the receiver.
The Telecommuting Module connects to an existing enterprise firewall through a DMZ port,
enabling the transmission of SIP-based communications without affecting firewall security.
SIP messages are then routed through the firewall to the private IP addresses of authorized
users on the internal network.
The Telecommuting Module can also be used as an extra gateway to the internal network
without connecting to the firewall, transmitting only SIP-based communications.
Configuration alternatives
The 3Com VCX IP Telecommuting Module can be connected to your network in three
different ways, depending on your needs.
Note that if the Standalone type is used, the interface which should receive traffic from the
outside must have a public IP address (no NAT).
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