VoIP Survivability for Branch Offices with Juniper SRX Service Gateways - Market Requirements

As enterprises all over the world migrate towards a fully IP-based communications infrastructure, many of them adopt a distributed approach to their deployments. The main communications control and management servers are located at the head office and serve both the head office and remote branch offices which are connected over the enterprise WAN.

Juniper Networks SRX Series Service Gateways are high-performance security, routing, and network solutions for enterprises of all sizes. Using SRX Service Gateways enterprises can deploy fully redundant IP networks to provide resiliency and continued service to branch offices in case of WAN failure. In addition, they can provide reliable and secure voice services to branch offices, by means of their support for PoE, quality of services mechanisms, a built-in SIP Application Layer Gateway and end-point authentication.

However, beyond the capabilities offered by the SRX Service Gateways, companies still need to be able to offer continued voice services in cases where the link to the head office is interrupted, either because of a WAN failure or loss of connection with the central IP-PBX. In such cases, the VoIP equipment at the branch offices must be able to provide uninterrupted service, allowing internal calls to continue and providing alternative routing for calls to external destinations.

VoIP Survivability for Branch Offices with Juniper SRX Service Gateways - AudioCodes Solution

AudioCodes Enterprise VoIP Gateways, when deployed in a Juniper SRX Service Gateway environment, provide the necessary functionality and resiliency to ensure that voice services remain available at branch offices even when connectivity to the main IP-PBX is lost.

The SAS (Stand Alone Survivability) feature, supported in AudioCodes Enterprise Digital and Analog VoIP Gateways, enables uninterrupted service for SIP endpoints, such as Enterprise Media Gateways, SIP IP Phones and SIP Soft Phones in the case of a network failure.

With the SAS feature enabled, the SIP endpoints at the branch office register with the central IP-PBX via the Media Gateway that acts as a proxy for all SIP registrations. If connectivity with the central IP-PBX is lost, the Media Gateway with SAS enabled takes control, handling new phone registrations and enabling internal calls in the disconnected branch office. Furthermore, if the SAS Media Gateway is configured with a connection to the PSTN, external calls can continue via the PSTN interface. During network downtime, basic call control features are provided by the SAS Media Gateway, and full functionality is restored once the connection with the IP-PBX at the head office is restored.

More details of AudioCodes’ solution for VoIP survivability with the Juniper SRX series can be found on the Juniper Networks website.

Solution Benefits

• Resilient solution for branch offices in distributed enterprise VoIP deployments
• High-performance, high-availability data networking provided by Juniper SRX Series Service Gateways
• Uninterrupted voice service at branch offices ensured by AudioCodes Media Gateways with SAS (Standalone Survivability)
• Backup option for external calls via Media Gateway PSTN interfaces
• Wide range of AudioCodes Media Gateways supporting analog and digital interfaces in a variety of port densities
• CAPEX savings with SAS functionality installed on media gateway platform