11 Deploy the SBC Cluster

If your business handles a high volume of WebRTC and MS Teams calls, or if you use an SBC to isolate your PBX, all calls will be routed through the SBC. In such cases, it is recommended to deploy the SBC in a cluster configuration to efficiently manage the call traffic.

Deployment Architecture

As illustrated in the diagram, the PBX is deployed on either a VLAN or a cloud platform. Multiple SBC servers are positioned in front of the PBX to prevent direct access by users.

DNS Configuration

You will need to create DNS records for each SBC server. The DNS records can be of the following types:

  • A Record

  • DNS SRV Record

For example, assume the SBC servers have the following IP addresses:

  • SBC 1: 72.247.113.11

  • SBC 2: 72.247.113.12

  • SBC 3: 72.247.113.13

You can create the following A Records for the SBC servers:

  • Resolve sbc1.sbc.com to 72.247.113.11

  • Resolve sbc2.sbc.com to 72.247.113.12

  • Resolve sbc3.sbc.com to 72.247.113.13

Additionally, you may create records to resolve sbc.com to all three SBC IPs:

  • Resolve sbc.com to 72.247.113.11

  • Resolve sbc.com to 72.247.113.12

  • Resolve sbc.com to 72.247.113.13

Certificates

Please purchase a wildcard TLS certificate for the domain sbc.com as per the article Certificates for TLS/HTTPS/WebRTC guide.

Configuring the SBC

Please follow the instructions in the Configuring PortSIP SBC for WebRTC topic to set up each SBC server. However, keep the following points in mind:

  • When adding certificates to the SBC, set the TLS domain to sbc.com and enable the This is SBC Web Domain Certificate option.

  • When configuring the Web Domain for the SBC, enter sbc.com for the Web Domain field.

Access the SBC

After completing the setup of the SBC servers, you can access the SBC Web Portal using the following URLs:

You can access the WebRTC client using this URL: https://sbc.com:10443/webrtc.

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