VoIP Automation Tester: SIP, API & CI/CD (Hybrid)

Randstad Digital; Ipswich; Hybrid; GBP 78,000 - 96,000; Part time

Job summary

Randstad Digital in Ipswich, UK, is seeking an Automation Tester with VoIP and SIP expertise for a 6-month contract with potential extension. You will build automated test frameworks for signaling and media handling, and diagnose issues using captures. Hybrid work: 3 days in the office, rest remote. Key focus on ensuring reliability of real-time voice/video systems.

Experience with Linux, Python, and CI/CD pipelines is essential to succeed in this role.

Qualifications

• Deep knowledge of SIP, RTP and SDP is required.
• Python and API automation experience is essential.
• Experience with packet captures and network analysis tools.
• Familiarity with VoIP tooling and Linux server administration is preferred.

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 such as Jenkins and GitLab.

Skills

SIP

RTP

SDP

Python

API automation

Tools

Wireshark

tcpdump

PCAP analysis

SIPp

Spectra

WinSIP

StarTrinity

RHEL/CentOS

Perimeta SBC

Metaswitch Rhino

Dialogic Media Server

Job description

Randstad Digital in Ipswich, UK, is seeking an Automation Tester with VoIP and SIP expertise for a 6-month contract with potential extension. You will build automated test frameworks for signaling and media handling, and diagnose issues using captures. Hybrid work: 3 days in the office, rest remote. Key focus on ensuring reliability of real-time voice/video systems.

Experience with Linux, Python, and CI/CD pipelines is essential to succeed in this role.