Comprehensive Interoperability & SIP-Based Feature Set Part of the Cisco Small Business Pro Series the SIP based Cisco SPA502G 1-Line IP Phone (Figure 1) has been tested to ensure comprehensive interoperability with equipment from voice over IP (Vo IP) infrastructure leaders enabling service providers to quickly roll out competitive feature-rich services to their customers.. With hundreds of features & configurable service parameters the Cisco SPA502G addresses the requirements of traditional business users while building on the advantages of IP telephony. Features such as easy station moves & shared line appearances (across local & geographically dispersed locations) are just some of the many advantages of the SPA502G.. The Cisco SPA502G 1-Line IP phone also supports productivity-enhancing features such as Voice View Express & Cisco XML applications when used with Cisco Unified Communications 500 Series in SPCP mode. Carrier-Grade Security Provisioning & Management The Cisco SPA502G uses standard encryption protocols to perform highly secure remote provisioning & unobtrusive in-service software upgrades. Remote provisioning tools include detailed performance measurement & troubleshooting features enabling network providers to deliver high-quality support to their subscribers. Remote provisioning also saves service providers the time & expense of managing preloading & reconfiguring customer premises equipment..