Senior Technical Support Engineer - SIP / VoIP / FoIP

Job not on LinkedIn

February 14

🔔 Pennsylvania – Remote

Although this job is listed in Pennsylvania, this company may be open to hiring remote in other states.

⏰ Full Time

🟠 Senior

📞 Support Engineer

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T38Fax Incorporated

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T38Fax is a T.38 Fax over IP (FoIP) service provider. We offer PSTN termination and origination (fax sending and receiving) over SIP trunks that have been optimized to offer extremely reliable faxing over WAN and LAN connections . Take advantage of our 30-day free trial, connect any T.38-capable device to our network and experience reliable fax send & receive with no wires, and no strings attached!

11 - 50 employees

📋 Description

• Provide Escalated (Tier 3) support for FoIP and SIP-related technical issues via email, phone and case management system (Zendesk). • Diagnose and troubleshoot SIP signaling, call setup failures, one-way audio, jitter, latency, and packet loss. • Analyze SIP traces, PCAP captures, and logs using tools like Wireshark and tcpdump. • Support T.38 Fax Over IP (FoIP) implementations, troubleshooting failed fax transmissions and improving reliability. • Work with PBX systems (Asterisk, FreePBX, 3CX, etc.), VoIP gateways, and SBCs. • Assist customers with network configurations, NAT traversal and firewall rules. • Escalate complex issues to engineering teams and collaborate with vendors as needed. • Take ownership of reported customer issues and see problems through to resolution, ensuring proper recording and closure of all issues. • Write documentation, knowledge base articles and FAQs, and document troubleshooting steps, best practices and solutions in the company's knowledge base for use by both internal staff and customers. • Test interoperability of new VoIP/FoIP equipment and create user guides for various IP-PBX and SIP-compatible devices for use with our SIP Trunking service.

🎯 Requirements

• Bachelor's Degree in Computer Science or related field, or combination of education and experience may be considered. • Solid understanding of networking fundamentals (TCP/IP, DNS, DHCP, NAT, VPNs and firewall rules) and networking protocols, in particular VoIP/SIP. • Experience with fax and/or FoIP a plus. • Experience with Wireshark. • Experience with Asterisk, Kamailio, FreeSWITCH, OpenSIPS, or cloud-based VoIP APIs (Twilio, Plivo, Telnyx, etc.). • Working knowledge of Linux/Unix Operating System. • Careful, methodical approach to troubleshooting complex technical issues. • Experience with help desk ticketing systems (Zendesk, Jira, ServiceNow, etc.). • Excellent written and verbal communications including the ability to explain complex technical concepts to customers. • Excellent customer-facing skills.

🏖️ Benefits

• Competitive salary with annual profit-sharing bonus • Casual, informal work environment • Flexible working arrangements (remote/hybrid options) • Generous PTO allowance • Healthcare • 401(k) • Flyers tickets with VIP parking • A team of aces • An open mind for new ideas and methodologies