Voice / Session Border Controller (SBC) Engineer

BrickRed Systems; Reading; On-site; GBP 70,000 - 100,000; Full time

Job summary

BrickRed Systems is seeking an experienced Voice / Session Border Controller (SBC) Engineer to design, implement, manage, and troubleshoot enterprise voice infrastructure in Reading, United Kingdom. You will work hands-on with SBC platforms, SIP trunking, call routing, TLS, certificates, codecs, and carrier integrations.

You will maintain reliable voice connectivity, resolve complex SIP issues, coordinate with carriers and vendors, monitor performance, and contribute to secure, high-quality

Qualifications

• 7–10+ years in enterprise voice engineering or unified communications.
• Hands-on with SBC platforms (AudioCodes, Cisco, Ribbon).
• Strong SIP, TLS, certificates, and secure voice knowledge.
• Experience with carrier/vendor coordination and call routing.

Responsibilities

• Configure and Troubleshoot SBCs and enterprise voice infra.
• Manage SIP trunks, signaling, call routing, and dial plans.
• Maintain TLS certificates and encryption for voice.
• Coordinate with carriers and third-party vendors.
• Monitor performance, troubleshoot call quality, and RCA engagements.

Skills

SBC platforms

SIP trunking

TLS/PKI

VoIP protocols

Network fundamentals

Troubleshooting voice

Call routing

QoS

Tools

AudioCodes SBC

Cisco SBC

Ribbon SBC

Job description

We are seeking an experienced Voice / Session Border Controller (SBC) Engineer to design, implement, manage, and troubleshoot enterprise voice infrastructure and communication systems. The ideal candidate will have strong hands-on experience with Session Border Controllers (SBCs), SIP trunking, call routing, TLS, certificates, codecs, and carrier integrations.

The role will focus on maintaining reliable voice connectivity, resolving complex call-routing and SIP-related issues, managing carrier/provider relationships, and ensuring secure and high-quality voice services across enterprise environments.

Key Responsibilities

• Configure, manage, and troubleshoot Session Border Controllers (SBCs) and enterprise voice infrastructure.
• Manage SIP trunks, SIP signaling, call routing, dial plans, and voice connectivity.
• Configure and maintain secure voice communications using TLS, certificates, and encryption protocols.
• Manage certificate lifecycle activities, including installation, renewal, rotation, and troubleshooting.
• Troubleshoot SIP signaling, call failures, call quality, latency, jitter, packet loss, and codec negotiation issues.
• Configure and optimize voice codecs, media handling, routing policies, and interoperability settings.
• Coordinate with telecom carriers, SIP trunk providers, and third-party vendors to resolve connectivity and call-quality issues.
• Monitor voice infrastructure performance, availability, and call quality.
• Perform root cause analysis (RCA) for recurring voice incidents and implement corrective actions.
• Support voice infrastructure upgrades, configuration changes, maintenance, and production deployments.
• Maintain technical documentation, call flows, SBC configurations, and operational procedures.
• Collaborate with network, security, infrastructure, and application teams to ensure reliable end-to-end voice services.

Required Skills and Experience

• 7-10+ years of experience in enterprise voice engineering, telecom, or unified communications.
• Strong hands-on experience with SBC platforms such as AudioCodes, Oracle/Ribbon, Cisco, or similar.
• Deep understanding of SIP protocols, SIP trunking, call flows, and call routing.
• Experience with TLS, SSL certificates, PKI, and secure voice communication.
• Strong knowledge of voice codecs such as G.711, G.729, and Opus.
• Experience troubleshooting SIP signaling, RTP media streams, call failures, and voice-quality issues.
• Experience working with telecom carriers, service providers, and SIP trunk vendors.
• Strong understanding of networking fundamentals, including TCP/IP, UDP, DNS, NAT, firewalls, and QoS.
• Proven experience handling production voice incidents and complex troubleshooting.

Preferred Skills

• Experience with Microsoft Teams Direct Routing or enterprise unified communications platforms.
• Exposure to SIPREC, SRTP, and voice security configurations.
• Experience with cloud-based telephony and contact center environments.
• Knowledge of Wireshark, SIP ladder traces, packet captures, and voice monitoring tools.
• Experience with high availability, SBC redundancy, and disaster recovery configurations.

Security Clearance Requirement

Security clearance is a project-specific requirement and may be required depending on the nature of the client engagement. Candidates may be required to obtain or hold valid UK Security Clearance (SC) for specific projects, subject to client and project requirements.

ABOUT BRICKRED SYSTEMS

BrickRed Systems is a global leader in next-generation technology consulting and workforce solutions, specializing in delivering high-quality talent across digital, engineering, marketing, analytics, finance, operations, and business transformation domains. With a strong emphasis on innovation, scalability, and client success, BrickRed Systems helps organizations solve complex business challenges by providing skilled professionals across strategy, technology, creative, and operational functions. BrickRed fosters a culture of continuous learning, collaboration, and excellence, enabling professionals to contribute to high-impact global initiatives while advancing their careers.