The SPA504G model from Cisco is ideal for business or home office use, has 4-line capability and can be used with an online telephone service provider or an IP private branch exchange. Easy to install, configure to your specifications and use. Featuring top quality wideband audio, ethernet ports and backlit display. The SPA504G supports expansion modules, Session Initiation Protocol and Smart Phone Control Protocol, to suit any business and it's needs. Secure remote provisioning provides support, upgrades, performance reports and troubleshooting. From the Cisco Small Business Pro Series, this model has been designed and tested with smaller companies and individuals in mind.