Voice Engineer

Radius Payment Solutions; Chester; Hybrid; GBP 50,000 - 75,000; Full time

Benefits offered by this job

Disability Confident

Mental Health First Aiders

Pride sponsorship

Volunteer programme

Payroll giving

Endometriosis friendly employer

Women-focused gym & events

Female health policy

Job summary

Radius Payment Solutions in Crewe is seeking a skilled Voice Platform Engineer to design, implement and support enterprise voice and unified communications systems. You will manage SIP trunks, SBCs, call routing and dial plans, while ensuring resilience, security and high performance across our voice services.

You'll work with cloud telephony and contact centre platforms, troubleshoot complex voice environments, and collaborate with providers to resolve carrier issues.

Qualifications

• Educated to degree level with a minimum 2:2 (Lower Second Class Honours).
• Proven experience of enterprise level voice and collaboration platforms and call recording and 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 unified communications platforms.
• Manage SIP trunks, Session Border Controllers, 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 telecommunications providers and vendors to resolve carrier issues.
• Perform root cause analysis and implement preventative measures.
• Support voice network requirements, including QoS, firewalls, routing and security.
• Assist with telephony migrations, platform upgrades and transformation projects.
• Support disaster recovery and business continuity requirements for voice services.
• Proactively monitor voice environments and service performance.
• Identify opportunities to improve call quality, reliability and operational efficiency.
• Produce reports on service availability, utilisation and performance metrics.
• Maintain technical documentation, architecture diagrams and operational procedures.
• Develop and maintain voice engineering standards and best practices.
• Support audit, compliance and security requirements relating to voice services.

Skills

enterprise voice platforms

SIP-based voice solutions

VoIP technologies

SBCs

call routing & dial plans

cloud telephony & contact centres

troubleshooting voice quality

carrier connectivity & SIP trunking

networking fundamentals

Microsoft Teams Direct Routing

Education

degree level with 2:2

Tools

Session Border Controllers

Job description

This role is responsible for the design, implementation, support and continuous improvement of our voice and telephony platforms.

You'll play a key role in delivering resilient, secure and high-performing voice services across the business, working with SIP-based communications, contact centre technologies, carrier connectivity, voice infrastructure, call routing and telephony integrations.

Whilst we use Five9 at Radius, we're equally interested in candidates who have supported comparable enterprise telephony or contact centre platforms. The key requirement is strong SIP and VoIP expertise and the ability to troubleshoot and optimise complex voice environments.

This role is based alongside the team in Crewe , with a hybrid pattern of 3 days per week in the office.

What you'll be doing

• Design, deploy and maintain enterprise voice and unified communications platforms.
• Manage SIP trunks, Session Border Controllers (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 telecommunications providers and vendors to resolve carrier issues.
• Perform root cause analysis and implement preventative measures.
• Support voice network requirements, including QoS, firewalls, routing and security.
• Assist with telephony migrations, platform upgrades and transformation projects.
• Support disaster recovery and business continuity requirements for voice services.
• Proactively monitor voice environments and service performance.
• Identify opportunities to improve call quality, reliability and operational efficiency.
• Produce reports on service availability, utilisation and performance metrics.
• Maintain technical documentation, architecture diagrams and operational procedures.
• Develop and maintain voice engineering standards and best practices.
• Support audit, compliance and security requirements relating to voice services., Our global DEI networks champion LGBTQ+ inclusion, cultural diversity, women's empowerment and mental health, neurodiversity and disability support.

We also offer

• Global Female Health Policy & Female Health Champions
• Pregnancy Loss and Fertility Treatment Policies
• Endometriosis Friendly Employer (UK)
• Women-focused gym & female health events
• Mental Health First Aiders
• Disability Confident Committed Employer (Level 2)
• Race at Work Charter signatory
• Proud sponsor of Crewe Pride (5 years running) and Cheshire Pride Awards Corporate Supporter 2025
• Community network driving charity and volunteering initiatives, with 8 consecutive years of participation in the UK Challenge.
• Give as you earn scheme (payroll giving) and match funding

Radius is an equal opportunities employer. We are committed to welcome people regardless of age, disability, gender identity, race, faith or belief, sexual orientation or socioeconomic background.

We are committed to ensuring an inclusive and accessible recruitment process for all candidates. If you require any adjustments or accommodations at any stage of the process, please let us know, and we will do our best to support you.

We reserve the right to close a vacancy before the closing date in the event of an overwhelming response or a change in business priorities.

• Educated to degree level with a minimum 2:2 (Lower Second Class Honours).
• Proven experience of enterprise level voice and collaboration platforms and call recording and 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.

What you can expect from us...

Meaningful work

This is an opportunity to take ownership of a business-critical voice environment and play a key role in shaping the future of telephony and contact centre services across the organisation. You'll work across modern voice technologies, SIP infrastructure and cloud contact centre platforms, helping to drive reliability, performance and continuous improvement.

A standout