The Cisco SPA508G features dual switched ethernet ports with IEEE 802.3af compliant PoE (Power Over Ethernet) support. The Cisco SPA508G also features a Message Waiting Indicator Light, 4-way navigation key, and 12 button dial pad, dedicated illuminated buttons for Volume, Hold, Menu settings and Voicemail access. The Cisco SPA508G works well with Asterisk, Trixbox, 3CX and other SIP based IP PBX platforms. The Cisco SPA508G supports the standard G.729a codec, as well as G.722 High Definition Audio and several other voice compression codecs. The Cisco SPA508G features a web UI for local provisioning and can also be provisioned remotely via TFTP, HTTP or HTTPS. Other features of the Cisco SPA508G include remote in-service firmware upgrade, XML configuration files, 256 Bit AES encryption of configuration files, and asynchronous notification of Upgrade Availability via SIP Notify.