VoIP Test Engineer

Dice is the leading career destination for tech experts at every stage of their careers. Our client, MAVLRA CORPORATION, is seeking the following. Apply via Dice today!
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 Responsibilities

• Design 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