Voice Test Engineer with IMS,SIP and Wireshark skills at Infoplus Technologies UK Ltd, Brentwood, £240 per day

£240 per day
  • Outside Spy
  • Brentwood CM13, UK
  • Nov 19, 2020
Duration not stated

Contract Description


We have an job opening for Voice Test Engineer with our client and the details are as below:

Job Type: Contract (Outside of IR35)
Duration: 6 Months extendable
Work Location: Brentwood, UK.

Job Description:

  • Subject Matter Expert in SIP protocol and has an understanding of 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.
  • Ability to use Wireshark as an analysis tool to debug VOIP traces. (SIP & RTP)
  • Networking fundamentals: understanding DHCPv4 and v6, DNS look ups (NAPTR/SRV/AAAA/A records). How analyses them on Wireshark.
  • Networking fundamental: understanding how IPV6 works and the difference between IPV4 and IPv6. How to search and identify the IP layer information using wireshark trace.
  • SIP: understanding the RTP Attributes. Identifying codecs, DTMF, SRTP etc.
  • SIP: analysing RTP traffic in Wireshark. How do you check is there is one way audio or the correct codec is used in the RTP streams.
  • SIP: how to filter for a specific call.
  • SIP: identifying the agreed IP and Ports for signaling and media.
  • Networking: understanding QoS for Voice and how it works. How to check is COS and ToS is applied using Wireshark.

Added Advantage/Desirable skills:

  • Has a good understanding of how an FXS port works and the FSK protocol.
  • Has a good knowledge of the TR-69/ 104 specification.
  • Experience in SBC.
  • Knowledge in NAT, DNS, B2B UA, Load Balancing/Resilience Testing.