VOIP Test Engineer

Mountain View, California, United StatesOnsiteContractPosted 2 months agoVisa sponsorship available

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Role summary

The VOIP Test Engineer will be responsible for designing, executing, and automating tests for carrier-grade VoIP systems. This role requires deep expertise in SIP protocol, ATA devices, and TR-069 provisioning. The engineer will perform various testing types including regression, negative, and scale testing, utilizing Wireshark for packet capture and log analysis. Proficiency in Python scripting for automation, REST API validation, and SQL for data reconciliation is essential. A strong understanding of networking fundamentals, including TCP/UDP, NAT, firewalls, QoS, and VLANs, is crucial for troubleshooting VoIP issues in diverse network environments.

Required Qualifications (Must-Have)

Carrier-Grade VoIP Expertise

- Strong hands-on experience with
SIP protocol (REGISTER, INVITE, BYE, CANCEL, OPTIONS)
- Deep understanding of SIP response codes, authentication flows, and retransmission behavior
- Strong knowledge of SDP negotiation and RTP/RTCP validation
- Experience troubleshooting SIP over TLS and SRTP

CPE / ATA Device Experience

- Hands-on experience with
ATA devices (Poly, Grandstream, or similar)
- Strong experience with
TR-069 remote provisioning and zero-touch configuration
- Experience validating device behavior behind NAT and residential gateways

Test Engineering & Validation

Experience designing and executing VoIP regression test cases
Experience performing negative testing (malformed SIP headers, auth failures, TLS failures)
Experience performing scale testing of endpoint registrations
Strong Wireshark packet capture and log analysis expertise

Automation & Validation

Proficiency in Python scripting
Experience automating bulk SIP registration validation
REST API validation experience
SQL knowledge for reconciliation and migration verification

Networking Fundamentals

Strong understanding of TCP/UDP, NAT traversal, firewall behavior, QoS, VLANs
Experience troubleshooting VoIP in residential and enterprise network environments

Preferred Qualifications

Experience in ISP / telecom / ITSP environments
Experience with SBC platforms (AudioCodes, Ribbon, CUBE, etc.)
Experience with SIP load testing tools (e.g., SIPp)
Experience working in a VoIP lab environment
Experience supporting high-scale residential voice deployments

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