Vendor needs to provide unified communications as a service. Provide information on Unified Communications as a Service (UCaaS) and Contact Center as a Service (CCaaS) solutions. The agency seeks to modernize communications and unify UCaaS and CCaaS into a single cloud platform. Critical Requirements include: Desktop, Browser and Mobile App Softphone options for UI; Survivable Branch options; Extension dialing; Ability to manage nuisance/SPAM calls; Operator/Attendant Console; E911 Location Management; 911 call notifications to Designated Internal Staff; Integration to Single Wire InformaCast system; Ability to SIMULTANEOUSLY ring IP phone, Analog phone, Ringer when Phone extension is called.