Infrastructure Scenario Tests

Zoom Phone cloud service experiences an outage during a severe weather event that also knocks out the primary internet circuit. The Zoom Phone Survivability Gateway (local appliance) fails to activate because it was never properly configured after installation. The office has no phone service — cloud calling is down and local failover doesn't work.

After a PBX configuration change, all ring groups are pointing to non-existent extensions. Inbound PSTN calls ring once and go to a generic voicemail box instead of reaching the intended departments. Sales, support, and main line calls are all misrouted. The issue was caused by an extension renumbering project that didn't update ring group memberships.

The call recording system stops capturing calls after the recording storage volume fills up. The VoIP system continues functioning but no calls are being recorded, putting the organization in violation of regulatory compliance requirements (HIPAA/PCI). The failure went undetected for 48 hours.

The primary SBC (Session Border Controller) suffers a hardware failure, dropping all active calls and preventing new call setup. The standby SBC fails to take over because the HA license expired. All inbound and outbound PSTN calls are completely offline.

Microsoft Teams Phone System experiences a regional outage affecting all Teams calling features. Users cannot make or receive PSTN calls through Teams. Direct Routing SBC shows the Teams backend as unreachable. Internal Teams chat and meetings work but all telephony features are offline.