VoIP enabled tools like the Vertical Phone System have become a common addition in most organizations. Companies rely upon strategically placed firewalls to protect their VoIP network from potential threats. Firewalls have, in fact, progressed with time and the options available in the market today are good enough to understand VoIP protocols like SIP and scrutinize the movement of data packets between SIP servers and the endpoints.
However, VoIP attacks are still not unheard of and compromises in security do happen in organizations of all types.
Alternative Ways for Enhanced VoIP Security
As the scope of VoIP applications extend beyond the premises of the enterprise, depending upon one single security solution that is cheap and easy to install will be a risk. Experts recommend taking the layered approach to best protect the VoIP infrastructure.
The Layered Approach
The layers of security start with the access endpoints in the system where the IP phones and other workstations are connected and they extend up to core of the Data Center where the IP telephony services are run.
These layers of security protect the network infrastructure significantly and safeguard every single component of the VoIP system from potential attacks. The most common types of VoIP attacked that can be prevented using this approach are IP address spoofing, STP (Spanning Tree Protocol) manipulation, LAN hopping as well as ARP poisoning.
The need for Encryption
Firewalls, in general, are applied before the core layer in order to ensure all traffic to and from the core are intercepted and scrutinized. When services extend beyond and into the Internet, security becomes a more complex task to be accomplished and encryption becomes significant. Thus, experts recommend using firewalls with transport layer security (TLS).
The TLS encryption method encrypts SIP signals to and from the Internet and ensures that the traffic is 100% protected. All signals are decrypted, scrutinized and then encrypted again before being delivered to the destination point. Calls are then delivered using the SRTP (Secure Real-time Transport Protocol) over the IP network.
The use of VoIP solutions have extended to remote locations, BYOD strategy as well as overseas calling through SIP providers. Thus, the layered approach for securing efficient systems like the Vertical Phone System becomes mandatory. Adequate hardware and IP phone proxy must complement your VoIP security strategy.
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