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Telephony Firewalls

A telephony firewall is designed to protect a telephone exchange or PBX, reporting on a variety of attacks, commonly referred to as phreaking. This may range from misuse, for example if a preset threshold of particular calls is exceeded, to attacks against the exchange such as wardialing, where many telephone extensions are called in order to solicit information about the end user device.


This section also includes VoIP or SIP-Aware firewalls.  SIP-aware firewalls have the ability to inspect the packets coming into the firewall and distinguish SIP voice traffic from regular data and allow SIP traffic to pass through without having to open ports, which opens the door to security issues.


Home/SOHO products that are VoIP or SIP-Aware are not included in this list.

SecureLogix Corporation

SecureLogix delivers the world?s first Voice Firewall to secure corporate resources from telephony borne attacks and security risks, and defend your VoIP and legacy voice systems from service disruption and abuse, unauthorized access, toll fraud, and othe ...

Public Domain - SourceForge

Siproxd is a proxy/masquerading daemon for the SIP protocol. It allows SIP clients (softphones & hardphones) to work behind an IP masquerading firewall or router.

The Ingate SIParator / Firewall SBC RTS-FW The Ingate SIParator is a powerful, flexible and cost-effective Enterprise Session Border Controller (E-SBC) for SIP connectivity, security and interoperability, such as connecting PBXs and Unified Communication ...

Ingate SIParator / Firewall