VoIP / SIP Automation Tester - Ipswich, UK

Randstad Technologies Recruitment; Ipswich; Hybrid; GBP 55,000 - 68,000; Full time

Job summary

Randstad Technologies Recruitment in the United Kingdom is seeking a VoIP Automation Tester for a 6-month contract in Ipswich. Hybrid work with 3 days per week in the office, payrate 300 to 369 per day on Inside IR35 via Umbrella.

You will build automated test frameworks for signaling and media handling, simulate load, diagnose issues via packet captures, and integrate scripts into Jenkins or GitLab CI/CD.

Qualifications

• Deep knowledge of SIP, RTP, and SDP.
• Proficient in Python and Robot Framework for test automation.
• Experience with packet capture analysis using Wireshark and tcpdump.
• Familiar with PCAP analysis and VoIP testing tools.

Responsibilities

• Build and maintain automated test frameworks for signaling and media handling.
• Simulate concurrent call load and network degradation.
• Diagnose audio drops and call failures using packet captures.
• Integrate test scripts into CI/CD pipelines (Jenkins, GitLab).

Skills

SIP

RTP

SDP

Python

Robot Framework

Wireshark

tcpdump

PCAP

SIPp

Spectra

WinSIP

StarTrinity

Linux

RHEL/CentOS

Server administration

Tools

SIPp

Spectra

WinSIP

StarTrinity

Job description

Role: VoIP Automation Tester
Type: Contract (6 Months with possible extension)
Location: Ipswich, UK
Working Model: Hybrid (3 days per week in office)
Payrate: 300 to 369 per day on Inside IR35 via Umbrella

We are looking for a highly skilled VoIP tester to ensure the reliability and quality of our real-time voice and video communication systems. If you can build automation frameworks from scratch and troubleshoot SIP call flows at the packet level, we want to hear from you.

The Role:

• Build and maintain automated test frameworks for signaling and media handling.
• Simulate concurrent call load and network degradation.
• Diagnose audio drops and call failures using packet captures.
• Integrate test scripts into CI/CD pipelines (Jenkins, GitLab).

Must-Have Skills:

• Protocols: Deep knowledge of SIP, RTP, and SDP.
• Automation: Python and Robot Framework.
• Diagnostics: Wireshark, tcpdump, PCAP analysis.
• VoIP Tools: SIPp, Spectra, WinSIP, or StarTrinity.
• OS/Systems: Linux (RHEL/CentOS) and basic server admin.

Nice-to-Have:

• Experience with Perimeta SBC, Metaswitch Rhino, or Dialogic Media Server.
• SSCA Certification or knowledge of IN protocols (INAP/MAP).