Voice Engineer: SIP/VoIP & Cloud Telephony Expert

Radius; Crewe; Hybrid; GBP 55,000 - 75,000; Full time

Benefits offered by this job

Pension

Life assurance

Electric Vehicle scheme

Employee assistance programme

Help@Hand wellness program

Cycle to work

Free breakfast

Free onsite gym

Job summary

Radius is seeking an experienced Voice Engineer to design, implement and continuously improve our voice and telephony platforms. Based in Crewe with a hybrid pattern of 3 days per week in the office, you will manage SIP trunks, SBCs, call routing and cloud telephony for enterprise scale services.

You will troubleshoot voice issues, optimise performance and work with vendors to resolve carrier challenges. You will contribute to resilience, security and integration across SIP, QoS, firewalls and

Qualifications

• Proven experience with enterprise voice and collaboration platforms and with call recording/reporting solutions.
• Strong experience supporting SIP-based voice solutions.
• Knowledge of Microsoft Teams phone including Direct Routing and Operator Connect.
• Excellent understanding of SIP signalling, RTP and VoIP technologies.
• Experience with Session Border Controllers.
• Knowledge of carrier connectivity, SIP trunking and number management.
• Experience supporting cloud telephony and contact centre platforms.
• Ability to troubleshoot complex voice and call quality issues.
• Strong networking fundamentals including TCP/IP, DNS, DHCP, VLANs, QoS, firewalls and routing.

Responsibilities

• Design, deploy and maintain enterprise voice and UC platforms.
• Manage SIP trunks, SBCs, call routing and dial plans.
• Support cloud telephony platforms, including contact centre solutions.
• Maintain voice platform availability, resilience and performance.
• Investigate and resolve voice-related incidents and service requests.
• Diagnose SIP signalling, media flow and call quality issues.
• Work with providers/vendors to resolve carrier issues.
• Perform root cause analysis and implement preventative measures.
• Support voice network requirements (QoS, firewalls, routing).
• Assist with migrations, upgrades and transformation projects.
• Support disaster recovery and business continuity for voice services.
• Proactively monitor voice environments and performance.
• Identify opportunities to improve call quality and efficiency.
• Produce reports on service availability and metrics.
• Maintain technical documentation and standards.

Skills

Enterprise voice platforms

SIP-based voice solutions

Microsoft Teams Direct Routing

SIP signalling / VoIP

Session Border Controllers

Carrier connectivity & SIP trunking

Cloud telephony & contact centres

Voice issue troubleshooting

Networking fundamentals (TCP/IP, DNS,

Job description

Radius is seeking an experienced Voice Engineer to design, implement and continuously improve our voice and telephony platforms. Based in Crewe with a hybrid pattern of 3 days per week in the office, you will manage SIP trunks, SBCs, call routing and cloud telephony for enterprise scale services.

You will troubleshoot voice issues, optimise performance and work with vendors to resolve carrier challenges. You will contribute to resilience, security and integration across SIP, QoS, firewalls and