Maintain voice service continuity where session border control cannot fail. The Redundant Pair of Base Mediant 800C ESBC is designed for organizations that need a resilient SBC deployment to protect SIP traffic, preserve call availability, and reduce exposure at the network edge. A redundant pair matters when the cost of interruption is measured in missed calls, failed registrations, and service desk escalation. This configuration is intended for high-availability voice architectures where one unit can stand by for the other, helping keep communications stable during maintenance events or unexpected hardware issues. Because it is based on the Mediant 800C ESBC platform, this solution fits enterprise voice environments that require controlled SIP interconnect, policy enforcement, and a more disciplined edge than a single-device deployment can provide. It is a strong fit for teams standardizing on redundancy as a design requirement rather than an afterthought. For procurement and architecture teams, the value is straightforward: fewer single points of failure, cleaner operational planning, and a deployment model aligned to business-critical voice services.