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 signalling and media.
Networking: understanding QoS for Voice and how it works. How to check is COS and ToS is applied using wireshark.
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.
UK/EU Citizens or ILR or (Tier-2/ICT) Dependants are encouraged to apply.
Candidates who reside in UK currently and looking for sponsorship are also eligible to apply.
Tagged as: VoIP
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