Cisco SPA512g is a single line SIP phone with dual 10/100/1000 Ethernet ports so that one cat5 cable drop can be used to bring high speed network connectivity to both your IP Phone and your PC.

Cisco SPA512G 1 Line IP Phones with 2-Port Gigabit Ethernet Switch provides the advanced voice and data communications features small businesses need to stay productive and responsive to customers. Part of the Cisco Small Business product portfolio, these stylish, affordable phones offer a rich array of functions, including simple station moves, shared line appearance across dispersed locations, and intelligent call handling and conferencing support. Based on Session Initiation Protocol (SIP), the Cisco SPA512G one line IP phone is fully interoperable with leading voice over IP (VoIP) equipment, for fast deployment and high availability. Highly secure remote provisioning streamlines installation, configuration, and management.
Cisco SPA512g Features:

Pixel-based display: 128 x 64 monochrome LCD graphical display with backlight
Four-way rocking directional knob for menu navigation
Voicemail message waiting indicator light
Voicemail message retrieval button
Dedicated hold button
Settings button for access to feature, setup, and configuration menus
Volume control rocking up/down knob controls handset, headset, speaker, ringer
Standard 12-button dialing pad
High-quality handset and cradle
Built-in high-quality microphone and speaker
Headset jack: 2.5 mm
Electronic Hook Switch (EHS) Support with selected Plantronics headsets with adapter
Gigabit Switch Port and PC Port: 1000BASE-T RJ-45
802.3af compliant Power over Ethernet (PoE)