RingCentral

RingCentral has been in the cloud communications business since 1999 — long before most companies understood what "cloud communications" would eventually mean. Today it operates one of the largest UCaaS (Unified Communications as a Service) platforms in the world, with millions of business users across phone, video, messaging, and contact center products. For small businesses that replaced their on-premise PBX systems with RingCentral, the platform is their entire phone system: if it goes down, calls don't ring, voicemails don't arrive, and fax (still widely used in healthcare and legal) stops working entirely.

RingCentral's infrastructure spans multiple data center regions and is built on its own global SIP (Session Initiation Protocol) network with redundant PSTN carrier interconnects. The platform must maintain near-carrier-grade uptime because it handles emergency calls (911) for businesses — a regulatory obligation that means RingCentral's reliability standards are comparable to traditional telecom carriers rather than typical SaaS products. Its contact center product (RingCX, formerly CxEngage) adds real-time call routing, IVR, and agent management systems on top of the core communications infrastructure.

When RingCentral experiences problems, businesses notice: desk phones rebooting or showing "no service" despite network connectivity, softphone apps on desktop or mobile failing to register with the SIP server (typically shown as a red "X" or "Offline" indicator), outbound calls connecting but with one-way audio or severe echo, inbound calls going directly to voicemail without ringing, fax transmissions failing silently with no error notification, the RingCentral app failing to sync message history across devices, and video meeting links not launching the desktop client.

Outage.gg monitors RingCentral server status. For businesses where RingCentral is the primary phone system, the live status page is the first resource to check when calls start behaving unexpectedly.