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Secure VoIP solutions
C21 Communications secure provider and exclusive distributor
of Topex products in the
Keep your VoIP network separate
If you don’t have to expose your VoIP system to the
Internet, then don’t. However, an increasing number of companies are opening
their VoIP networks to facilitate communications with mobile workers using
softphones or laptops to connect via the Internet.
Take every step to ensure that there is some level of authentication and
encryption in place for these communications. A
(VPN) is a good way to maintain the integrity of communications from any
trusted person connecting to your VoIP system from an un-trusted network.
Many organisations still use closed VoIP systems as an internal tool to call
between office locations. But even if it is blocked off from the Internet, you
still need to separate it from your desktop and network environments, any key
servers, and other VoIP networks.
Likewise, if your VoIP network runs in a converged environment, you’ll need to
separate it at an abstract level – using a VPN or VLAN – to ensure that any
attacks or compromises to the network are localised and don’t affect your VoIP
equipment, and vice versa.
Implement VoIP-aware security intelligence
Even if you are diligent about keeping your VoIP network separate, and
you’ve implemented a VPN to protect both internal and external communications,
there are still attacks specifically designed for VoIP that require a deeper
level of protection. For instance, there will be people who have legitimate
access to your VoIP network who can use this access to launch an attack or
conduct other illicit activities such as eavesdropping or hijacking calls.
VoIP architecture contains many different protocols, which standard intrusion
prevention systems (IPS) and firewalls are not capable of handling. Make sure
to implement IPS and firewall technology that is "VoIP aware" and can
look deep into the traffic. You want to be able to allow legitimate users to go
through, while accurately identifying and blocking suspect traffic before it
becomes a threat.
You also want to ensure that you have intelligent IPS deployed between VoIP
gateways and near your call manager, a key area of attack that contains all
your critical user information.
Protect against rogue VoIP usage
It is almost guaranteed in any sizable company that you’ll find
unsanctioned use of consumer peer-to-peer VoIP technologies such as Skype or
Google Talk. These tools introduce a high level of risk to your network since
they are designed to find multiple ways to tunnel out of the network to the
Internet, easily bypassing standard firewalls.
One way to address this is to install VoIP-aware IPS and firewalls at all the
key access points, which will enable the organisation to design a policy to
either block this type of traffic entirely or decide who can use these tools
and in what capacity.
Enquiries:
Contact Number: 07836 764444