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Job DescriptionVoIP Test Engineer - SIP protocol, IMS, VoIP Location: East London We are actively looking to secure a Test Engineer to join Experis as one of our expert consultants, delivering services to our clients. Experis Consultancy is a Global entity with a well-established team with over 1000 consultants on assignment across 20 clients globally. Our UK operation is growing and has very aggressive plans for expansion over the coming years. We form part of the Manpower group of companies that turn over $20 billion a year collectively. Experis UK have partnerships with major clients across the UK spanning multiple industries; our approach is a very personal one, with both our clients and our own employees. We are passionate about training, technology and career development. Role Description: The primary purpose of this role is to test the SIP ATA functionality. Key Responsibilities: As a VoIP Test Engineer you will be asked to: * Design test cases against the SIP/VoIP requirements * Setup the test lab to execute each test case * Execute test cases, including: * confirm compliance to the VoIP specification for each test case marked "pass" * raise Jira tickets for any test case marked "fail" * investigate the root cause of any issue found * suggest amendments to the test case/test lab as appropriate * Write summary and exit reports at the end of each test cycle Required Technical Skills: * Subject Matter Expert in SIP protocol and understands IMS infrastructure. * Has expertise to analyse call-flows and point out protocol issues. * Knowledge in VoIP and IMS domain. * Has a proactive attitude for testing and having the expertise to suggest amendments to the test plan as and when required. * Has a good understanding of TCP-IP protocol stack. * Good understanding of RTP, RTCP, RTP Events, DTMF and SDP. * Good understanding in Voice/network troubleshooting techniques, including packet captures through Wireshark and trace analysis. Desirable Skills: * Experience using Redmine ticket tracking application * Knowledge of the H.323 protocol. * Good understanding of how an FXS port works and the FSK protocol. * Good knowledge of the TR-69/ 104 specification. * Experience with SBCs * Knowledge of NAT, DNS, B2B UA, Load Balancing/Resilience Testing. Interested candidates should submit their CV in the first instance. For more information, please contact Emily Buttifant via

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