Specifications include, but are not limited to: The Coalition desires to receive proposals for the selection of a unified communication, Private Branch Exchange (PBX) system, that provides the following specifications: Core PBX Requirements • Open Standard Session Initiation Protocol (SIP) based PBX. Must be able to support multiple brands of handsets including but not limited to softphones, conference room phones, SIP desktop phones and mobile client softphone (if vendor does not supply one) • Fully cloud based PBX • Ability to create complex digital assistant greetings. • Ability to route calls around time conditions. • Ability to create ring/hunt groups. • Public Switched Telephone Network (PSTN) connected Direct Inward Dialing (DID) extension with voicemail, threeway calling, call transferring, and call forwarding. • Ability to change locations quickly and easily and E911 address for employees. Software Requirements • Must provide (non-java based) desktop client to popular operating systems such as Apple MacOSX, Microsoft Windows 7+ and Google Chrome OS (Operating System) • Software client must have the ability to listen to voicemail, instant message between employees. • Must be able to see full call log from the software app. • Must be able to create and view a company address book