Implementing a Hybrid Cloud Media Path with On-Premise Edges and AWS PrivateLink

How-To-Articles
1

Implementing a Hybrid Cloud Media Path with On-Premise Edges and AWS PrivateLink

What This Guide Covers

  • Architecting a Hybrid Cloud deployment using Genesys Cloud Local Edges for environments where regulatory compliance prohibits voice media from traversing the public internet.
  • Configuring AWS PrivateLink and AWS Direct Connect to establish a private, dedicated network path for signaling and management traffic between your on-premise datacenter and the Genesys Cloud AWS region.
  • The end result is a highly secure, low-latency telephony architecture where internal calls and PBX integrations remain entirely within your corporate LAN, while still leveraging the cloud for routing intelligence and analytics.

Prerequisites, Roles & Licensing

  • Licensing: Genesys Cloud CX 1, 2, or 3.
  • Permissions: Telephony > Edge > Edit, Telephony > Trunk > Edit.
  • Infrastructure: Physical or Virtual (Hyper-V/ESXi) Genesys Cloud Edge servers installed in your datacenter, an active AWS Direct Connect circuit, and a private SIP trunk from your carrier.

The Implementation Deep-Dive

1. The Threat of Public Internet Media

In a standard Genesys Cloud deployment (Cloud Voice or BYOC-Cloud), all SIP signaling and RTP media packets travel across the public internet to AWS.

The Trap:
For government agencies, defense contractors, and high-security financial institutions, sending unencrypted (or even encrypted) voice media over the public internet is a strict regulatory violation. Furthermore, if your contact center shares a massive headquarters with 5,000 corporate PBX users, routing internal extension-to-extension calls out to the internet and back in adds unnecessary latency and consumes massive internet bandwidth.

2. The Hybrid Architecture: Local Edges

To keep media on-premise, you must deploy Genesys Cloud Local Edges.

Architectural Reasoning:
A Local Edge is essentially a media server that sits in your datacenter. The “Brain” (routing logic, IVR menus, reporting) remains in the AWS Cloud. The “Brawn” (the actual audio streams, SIP trunk terminations, and call recording storage) remains on your Local Edge.

Implementation Steps:

  1. Provision a Virtual Edge (OVA) on your VMware ESXi cluster.
  2. In the Genesys Cloud Admin UI, navigate to Telephony > Edges. Click Provision New Edge.
  3. Download the configuration file and inject it into your VM.
  4. The Media Path: Configure your carrier SIP Trunk to point directly to the local IP address of your Edge. When a customer calls, the audio goes from the Carrier → Your Datacenter → Your Edge → Your Agent’s Phone. The media never hits the public internet.

3. Securing the Management Path via AWS PrivateLink

Even with Local Edges handling the media, the Edge must still talk to the “Brain” in AWS for routing instructions. This is the Management and Signaling path.

The Trap:
By default, the Local Edge uses its outbound internet gateway to reach https://api.mypurecloud.com over the public internet to ask for routing instructions. This violates strict Zero-Trust network policies that forbid datacenter servers from having public internet access.

Implementation Steps (AWS Direct Connect + PrivateLink):

  1. You must purchase an AWS Direct Connect circuit, providing a dedicated fiber link from your datacenter to your local AWS Region.
  2. In your AWS Account, create a VPC Endpoint (PrivateLink) for the Genesys Cloud services. Note: Genesys Cloud must explicitly authorize your AWS Account ID to access their Endpoint Services.
  3. Configure your datacenter routing tables. When the Local Edge tries to resolve api.mypurecloud.com or proxy.mypurecloud.com, your internal DNS must resolve it to the private IP address of your AWS VPC Endpoint.
  4. The signaling traffic now flows securely over the dedicated fiber circuit into the Genesys AWS VPC, completely bypassing the public internet.

4. Local Call Recording and Storage

If you cannot send media to the cloud, you likely cannot send call recordings to the cloud either.

Implementation Steps:

  1. By default, Local Edges compress call recordings and upload them to Genesys Cloud AWS S3 buckets overnight.
  2. To prevent this, you must configure Local Storage.
  3. Attach a large iSCSI or NFS Datastore (e.g., a NetApp SAN) to your Virtual Edge.
  4. In Genesys Cloud, navigate to Admin > Telephony > Edges > Edit Edge.
  5. Under the Recording tab, configure the Edge to save recordings exclusively to the local Datastore. Ensure your external transcription engines (if any) pull the audio directly from this local SAN rather than querying the cloud API.

Validation, Edge Cases & Troubleshooting

Edge Case 1: The WebRTC Proxy Problem

  • The Failure Condition: You deploy Local Edges. Your agents log in using the Genesys Cloud WebRTC phone in their browser. They answer a call. There is dead silence.
  • The Root Cause: WebRTC media tries to negotiate a peer-to-peer connection between the agent’s browser and the Local Edge. If your agents are working from home (off the corporate network), their home PC cannot reach the private IP 10.0.5.20 of your Local Edge.
  • The Solution: You must deploy a TURN/STUN Proxy in your corporate DMZ, or require all remote agents to use a VPN. Alternatively, configure Genesys Cloud to use Cloud Media for remote agents (sending their media to AWS) and configure an Edge Tie-Line (a SIP trunk between your Local Edge and the Cloud Edge) to bridge the call.

Edge Case 2: The Edge Disconnect (Survivability)

  • The Failure Condition: A backhoe cuts the fiber line serving your AWS Direct Connect circuit. The Local Edges lose connection to the “Brain” in AWS. Incoming calls ring endlessly and fail.
  • The Root Cause: Without the AWS routing engine, the Local Edge does not know what to do with the call.
  • The Solution: Configure Edge Survivability. In the Edge settings, configure a “Fallback” SIP profile. If the Edge detects that it has lost connection to the cloud API for more than 60 seconds, it shifts into Survivability Mode. You can configure local, rudimentary routing rules directly on the appliance (e.g., “If called number = 555-1234, route to Hunt Group 1”). The IVR will be offline, but basic telephony will survive.

Official References