Test Engineer-VoIP ATA/CPE device test

VoIP Test EngineerLocation : Mountain View, CA-Onsite ( 5 days Onsite)We are currently able to consider only W2 candidates for this role.Overview: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.Core Focus Areas:ATA devices (Customer Premise Equipment)TR-069 provisioningRemote device lifecycle managementSIP packet-level troubleshootingSIP over TLS / SRTPClient interoperability validationResidential voice migrationLab-based validationAutomation mindset (Python)CPE firmware validationNAT traversal testingRequired Qualifications (Must-Have)Carrier-Grade VoIP ExpertiseStrong hands-on experience with SIP protocol (REGISTER, INVITE, BYE, CANCEL, OPTIONS)Deep understanding of SIP response codes, authentication flows, and retransmission behaviorStrong knowledge of SDP negotiation and RTP/RTCP validationExperience troubleshooting SIP over TLS and SRTPCPE / ATA Device ExperienceHands-on experience with ATA devices (Poly, Grandstream, or similar)Strong experience with TR-069 remote provisioning and zero-touch configurationExperience validating device behavior behind NAT and residential gatewaysTest Engineering & ValidationExperience designing and executing VoIP regression test casesExperience performing negative testing (malformed SIP headers, auth failures, TLS failures)Experience performing scale testing of endpoint registrationsStrong Wireshark packet capture and log analysis expertiseAutomation & ValidationProficiency in Python scriptingExperience automating bulk SIP registration validationREST API validation experienceSQL knowledge for reconciliation and migration verificationNetworking FundamentalsStrong understanding of TCP/UDP, NAT traversal, firewall behavior, QoS, VLANsExperience troubleshooting VoIP in residential and enterprise network environmentsKey ResponsibilitiesDesign and execute comprehensive VoIP regression and migration validation test plansValidate ATA/CPE provisioning workflows using TR-069Perform end-to-end validation of:SIP registrationInbound/outbound callingVoicemailE911 routingBilling alignmentTroubleshoot SIP signaling issues using packet-level analysis (Wireshark)Validate SIP over TLS and SRTP sessions including certificate negotiation and encryption issuesTest devices behind NAT/firewalls and validate RTP/media path behaviorConduct interoperability testing between ATAs, Clients, and cloud voice platformsPerform firmware validation and lifecycle testing of CPE devicesReproduce and isolate VoIP defects observed in productionAutomate repetitive validation workflows using Python and REST APIsUse SQL queries to validate provisioning accuracy and migration completenessSupport production-readiness validation prior to platform cutover