Senior VoIP Test Engineer - Mountain View
16 hours ago
Job description
Role :
: Senior VoIP Test Engineer
Onsite: 5 days a week – Mountain View , CA
Contract/ Fulltime Job
Seeking a highly skilled Senior VoIP Test Engineer to support the migration and validation of its residential and enterprise voice platform as part of a transition from Voice to a third-party cloud-based telephony platform.
This role is focused on carrier-grade SIP validation, ATA/CPE device testing, TR-069 provisioning, and large-scale endpoint migration testing within a hands-on lab environment.
The ideal candidate brings deep protocol-level expertise, strong troubleshooting capability, and an automation mindset to ensure platform reliability at scale.
Key ResponsibilitiesDesign and execute comprehensive VoIP regression and migration validation test plans
Validate ATA/CPE provisioning workflows using TR-069
Perform end-to-end validation of:
SIP registration
Inbound/outbound calling
Voicemail
E911 routing
Billing alignment
Troubleshoot SIP signaling issues using packet-level analysis (Wireshark)
Validate SIP over TLS and SRTP sessions including certificate negotiation and encryption issues
Test devices behind NAT/firewalls and validate RTP/media path behavior
Conduct interoperability testing between ATAs, SBCs, and cloud voice platforms
Perform firmware validation and lifecycle testing of CPE devices
Reproduce and isolate VoIP defects observed in production
Automate repetitive validation workflows using Python and REST APIs
Use SQL queries to validate provisioning accuracy and migration completeness
Support production-readiness validation prior to platform cutover
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
Critical Attributes for Success
Structured troubleshooting mindset
Strong protocol-level knowledge
Ability to work hands-on in lab daily
High attention to detail
Long-term relocation commitment and stability
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