Cisco PIX Security Appliance customers are encouraged to migrate to Cisco ASA 5500 Series Adaptive Security Appliances. Built on the same software foundation as Cisco PIX Security Appliances, the Cisco ASA 5500 Series offers more robust firewall and IPsec VPN capabilities, as well as many additional benefits, including significantly better performance and scalability, Secure Sockets Layer (SSL) VPN support (including clientless, portal-based remote access), advanced Unified Communications (voice/video) security, plus a modular design that allows you to add features such as intrusion prevention (IPS), anti-virus, anti-spam, anti-phishing, and URL filtering.
Cisco PIX 500 Series Security Appliances Specs