Test Engineer-VoIP, ATA devices -- ONSITE (LOCAL only) --W2

VoIP Test Engineer 
Location :           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 provisioning

• Remote device lifecycle management

• SIP packet-level troubleshooting

• SIP over TLS / SRTP

• SBC interoperability validation

• Residential voice migration

• Lab-based validation

• Automation mindset (Python)

• CPE firmware validation

• NAT traversal testing

 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