Contract - VoIP Test Engineer

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Barnston, UK
Closing date
18 Sep 2020

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Technology & New Media
Contract Type
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VoIP Test Engineer


6 Month Contract


The primary purpose of this role is to test the SIP ATA functionality of the CPE Hub.

Your key responsibilities

As a VoIP test engineer you will be asked to:
  • Design test cases against the current SIP/VoIP requirements
  • Setup the test lab to execute each test case
  • Execute test cases, including:
  • confirm compliance to VoIP specification for each test case marked "pass"
  • raise Jira/Redmine 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
  • 2-3 years experience testing VoIP either on the Core (IMS) side or Access (ATA) side.
  • 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.

Nice to have
  • Experience using Redmine/Jira 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 such as Nokia, Huawei and Genband
  • Knowledge of NAT, DNS, B2B UA, Load Balancing/Resilience Testing
  • Experience using Call generator like but not limited to Spirent Abacus and Emutel Harmony
  • Experience using a Terminal Line simulator like but not limited to Advent Ai520

To find out more please send your CV to Rocky Tsang at
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