Implementing Disaster Recovery Failover for Regional WebRTC Media Edges

How-To-Articles
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Implementing Disaster Recovery Failover for Regional WebRTC Media Edges

What This Guide Covers

  • Architecting a high-availability WebRTC media tier that survives regional AWS outages or local ISP failures.
  • Configuring Edge Groups and Sites to enable automatic, sub-second failover for active voice interactions.
  • Implementing “Active-Active” media path strategies for global organizations with remote workers distributed across multiple geographic regions.

Prerequisites, Roles & Licensing

  • Licensing: Genesys Cloud CX 1/2/3.
  • Permissions:
    • Telephony > Edge > View, Edit
    • Telephony > Site > View, Edit
    • Telephony > Trunk > View, Edit
  • Technical Infrastructure: Multiple Edge Groups configured across at least two distinct Genesys Cloud Regions (e.g., us-east-1 and us-west-2).

The Implementation Deep-Dive

1. The Multi-Region Site Architecture

The core of WebRTC disaster recovery (DR) is how you group your resources. A “Site” in Genesys Cloud represents a physical or logical location, and each Site is associated with an Edge Group.

The Implementation:

  1. Navigate to Admin > Telephony > Sites.
  2. Create a “Primary Site” and a “Secondary Site” (DR).
  3. The Solution: Instead of putting all your WebRTC phones into one Site, use Regional Edge Groups. Add the Primary Edge Group and the Secondary Edge Group to the Site’s Edge Group List.
  4. The Trap: Using a single “Global” Edge Group for everything. If the region hosting that Edge Group experiences an outage (e.g., an AWS control plane failure), every phone in that group loses connectivity. You must have at least two Edge Groups in separate regions to achieve true DR.

2. Configuring “Active-Active” WebRTC Trunks

To ensure a seamless transition during a failure, your WebRTC trunks must be configured for Active-Active media handling.

The Configuration:

  1. Go to Admin > Telephony > Trunks.
  2. Select your WebRTC Phone Trunk.
  3. Under Media Inactivity, set the timeout to a conservative value (e.g., 10-15 seconds).
  4. Ensure that both the Primary and Secondary Edge Groups are assigned to the trunk’s Outbound Route.
  5. Architectural Reasoning: When a WebRTC phone attempts to establish a media path, Genesys Cloud will attempt the first Edge Group in the list. If that region is unreachable, it will immediately fail over to the next group. This happens at the signaling layer, often before the agent even hears a “jitter” in the call.

3. Implementing “Media Path Optimization” (MPO)

For remote workers, the media doesn’t always have to flow through your corporate datacenter. MPO allows the WebRTC stream to take the shortest path between the agent and the Genesys Cloud media server.

The Implementation:

  1. In the Site settings, enable Media Path Optimization.
  2. The Trap: Disabling MPO while using regional failover. Without MPO, if an agent in New York fails over to an Edge in London (Secondary Region), their audio will travel from New York → London → Back to the Customer. This adds 200ms+ of latency, leading to “Talk Over” and poor voice quality. MPO ensures the agent connects to the closest available media node, even during a failover event.

4. Testing “Force Failover” Without Downtime

A DR plan is useless if it isn’t tested. You should regularly perform a “Simulated Region Outage.”

The Test Workflow:

  1. Identify a subset of test agents.
  2. In the Admin > Telephony > Edges UI, manually set the Primary Edge Group to “Maintenance Mode.”
  3. Observe the test agents’ status. They should see a brief “Reconnecting” message in the Genesys Cloud UI, but their active calls should remain connected as the media path re-negotiates to the Secondary Edge Group.
  4. The Trap: Forgetting to check STUN/TURN configurations. Many firewalls only allow WebRTC traffic to specific IP ranges. If your Primary Region is us-east-1 and your Secondary is eu-west-1, you must ensure your corporate firewall whitelists the media IP ranges for both regions. Failure to do this will result in “One-Way Audio” the moment failover occurs.

Validation, Edge Cases & Troubleshooting

Edge Case 1: The “Zombi Session”

Failure Condition: A region fails, and the agent’s browser keeps trying to connect to the dead WebSocket.
Root Cause: DNS caching or browser-level socket persistence.
Solution: Instruct agents to perform a Hard Refresh (Ctrl+F5) if they see a persistent “Disconnected” state for more than 30 seconds. Additionally, configure your SAML IdP to have a shorter session timeout for WebRTC clients to force a re-authentication and fresh DNS lookup during major outages.

Edge Case 2: Outbound Caller ID Mismatch

Failure Condition: After failover to a different region, outbound calls are rejected by the carrier or show the wrong Caller ID.
Root Cause: The Secondary Edge Group is using a different Trunk configuration that hasn’t been synced with your SIP carrier.
Solution: Ensure your BYOC (Bring Your Own Carrier) trunks are mirrored across regions. Your SIP provider must be aware of the IP addresses for both your Primary and Secondary Genesys Cloud Media Tiers to accept traffic from either.

Edge Case 3: Recording Lag

Failure Condition: Calls that failed over to the Secondary Region take hours to appear in the “Interactions” view for QA.
Root Cause: During a regional outage, the “Recording Upload” service might be backlogged as it tries to sync data between regions.
Solution: This is an expected architectural trade-off. Inform your QA team that during a DR event, there is a 4-8 hour “Hydration Window” for recordings to move from the temporary media storage to the permanent long-term archive.

Official References