Multi-Region High Availability BPO Platform

Category: Industry Solutions

Architecture diagram

High-level view of the main components and data/control flows.

Low-level architecture diagram (Visio-style)

Implementation view (networking, security, ops). Click to open full size.

Low-level architecture details

Step-by-step implementation

Step 1/6

Define SLOs and workloads

• Identify critical components (AVD, CRM integration, dialer, ticketing).
• Set availability/error budgets.
• Decide active-active vs active-passive per component.

Validation checklist

• Stakeholders have signed off the scope, SLAs, and data/security requirements.
• You have documented naming standards, environments, and ownership (RACI).

Step 2/6

Global ingress and security edge

• Use Front Door + WAF for global routing.
• Use DDoS protection for VNets.
• Standardize TLS and cert rotation.

Validation checklist

• The target VNet/subnets/peerings/UDRs/NSGs are deployed with no errors.
• Connectivity test passes (e.g., Network Watcher connection troubleshoot / ping between subnets where allowed).
• Egress is controlled (traffic observed in Firewall logs if applicable).

Step 3/6

Deploy compute across regions

• Use App Service/AKS depending on workload.
• Keep infrastructure identical via IaC.
• Use zone redundancy where supported.

Validation checklist

• Deployment completed; smoke tests passed; rollback plan confirmed.

Step 4/6

Data strategy

• Use SQL failover groups or Cosmos multi-region.
• Define consistency and conflict resolution.
• Replicate secrets and configuration.

Validation checklist

• Failover procedure is documented and tested (tabletop + technical drill).
• RPO/RTO measured and meets requirements.

Step 5/6

Operations and incident response

• Centralize logs/metrics; create SLO dashboards.
• Automate failover and paging via action groups.
• Run game days.

Validation checklist

• Logs and metrics are flowing (check Log Analytics / Monitor).
• Alerts trigger correctly (test alert path to email/Teams/ITSM).

Step 6/6

Continuity tests

• Simulate regional outage and validate recovery.
• Validate agent session continuity and routing.
• Document customer communication templates.

Validation checklist

• UAT completed with representative users and scenarios.
• Performance meets baseline; issues tracked and remediated.

Video tutorials

• Using Azure Cross-region Load Balancer for HA scenarios (Azure Friday)
• Protect your web apps using WAF with Azure Front Door (Azure Friday)

References

• Azure reliability
• Azure Front Door