Telephony Engineer
Semafone
The Telephony Engineer is a subject‑matter expert responsible for architecting complex telephony integrations, optimizing SBC behavior, guiding customer design decisions, and ensuring Sycurio’s voice platform maintains secure, resilient, PCI‑compliant performance. This engineer leads large customer delivery efforts, resolves advanced SIP/RTP/TLS issues, establishes best practices, and mentors junior team members.
Responsibilities
- Support the design and implementation of SIP trunking, call routing logic, and resilient configurations.
- Assist in building secure and reliable call delivery flows in line with business and customer requirements.
- Configure DTMF masking, RTP/SRTP handling, SIP header manipulation, and failover routing.
- Work with internal teams to validate routing across carriers, CCaaS platforms, and customer IP PBXs.
- Configure, maintain, and troubleshoot SBC platforms (e.g. Oracle, AudioCodes).
- Support SIP routing, topology hiding, and header manipulation tasks.
- Troubleshoot SIP call flows, including common issues with re-INVITEs, session refreshes, and media handling.
- Perform basic to intermediate packet and RTP analysis (e.g. jitter, latency, packet loss).
- Support customer deployments, testing, and implementation activities.
- Assist with telephony cutovers and configuration changes.
- Contribute to documentation, including configuration templates and support guides.
- Act as an escalation point for operational telephony issues where required.
- Work with Network and Cloud teams on connectivity, routing, and infrastructure setup.
- Support product and engineering teams with telephony-related input.
- Communicate effectively with internal teams and customers to resolve issues and explain solutions.
Design & Implementation
SBC Configuration & Support
Delivery & Operations
Cross-Functional Collaboration
Required Skills
- 2–5 years’ experience in SIP, VoIP, or telephony engineering roles.
- Solid understanding of:
- SIP fundamentals (call flows, messaging, basic troubleshooting)
- RTP/SRTP and codec behaviour
- Basic TLS and certificate concepts
- Experience working with SBCs (e.g. AudioCodes, Oracle, or similar).
- Ability to analyse SIP traces and troubleshoot call issues.
- Good understanding of networking fundamentals (TCP/IP, VLANs, subnetting).
- Familiarity with enterprise connectivity (e.g. internet, VPN, MPLS).
- Exposure to virtualised environments (e.g. VMware, KVM, Hyper-V).
- Strong communication skills and ability to work collaboratively.
- Experience with cloud-based telephony environments (e.g. AWS).
- Familiarity with carrier SIP and routing requirements.
- Exposure to CCaaS platforms.
- Basic scripting or automation knowledge.
- Awareness of compliance standards such as PCI DSS.
- Experience with Asterisk, RTPengine, Kamailio, or FreeSWITCH.
- Exposure to tools such as HEPIC or HOMER.
Nice to Have Skills
Bonus
Benefits & Culture:
We are a market leader in secure voice transactions and trusted by our customers and partners. We are on a journey to secure all personal data. We recruit diverse, ambitious, innovative people who want to grow in a supportive and collaborative environment. We are passionate, work hard, have fun and celebrate success.
What we'll give you;
15 Days Holiday*
Competitive Salary
Up to 10% Bonus*
4 x Salary Life Insurance
General Health Insurance*
Access to LinkedIn Learning for ongoing professional development
Sycurio is well funded and growing fast, you’ll be joining an organization that combines an entrepreneurial ‘start-up’ culture with the professionalism of a mature and established business. This is a fabulous opportunity to gain experience on a variety of commercial matters of an international business.
*All final interview candidates will be subject to Background check as a pre-condition of a potential offer of employment. Any information found will be considered when making the final hiring decision. Please be aware that the background check process will not go ahead without your written consent.