VoIP Test Engineer
Role details
Job location
Tech stack
Job description
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
Requirements
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
