VoIP Engineer

Mijas Consultants Jaipur; Hyderabad; On-site; INR 1,000,000 - 2,000,000; Full time

Job summary

We are seeking a skilled VoIP engineer to build, run, and debug our telephony infrastructure. You will own end-to-end call flow, SIP servers, and cloud deployment from provisioning a SIP proxy to tracing one-way audio issues.

You will configure dialplans, manage SIP trunk connectivity, and ensure resilient operation across AWS-based infrastructure. You will work with backend engineers and support teams to diagnose and resolve call quality problems quickly.

Qualifications

• Familiarity with telephony/VoIP stack (FreeSWITCH, Kamailio, OpenSIPS, Asterisk, or similar).
• Working understanding of SIP and RTP: call setup, registration, common response codes, media negotiation.
• Comfortable in a Linux terminal (systemd, logs, permissions, basic shell scripting).
• Basic networking knowledge — NAT, firewalls, ports, DNS, TCP/UDP.
• Experience with AWS or a comparable cloud/VPC platform.
• Ability to procure and read packet captures and logs to trace a call end to end.

Responsibilities

• Build and operate the telephony stack.
• Set up and maintain VoIP nodes SIP proxies, PBX, media servers — and wire them into a resilient stack.
• Configure dialplans, routing logic, and call flows (IVR, transfers, forking, recording, conferencing).
• Manage carrier and SIP trunk connectivity: registrations, DIDs, number routing, failover between providers.
• Configure supporting services — SSH, web servers, reverse proxies, process managers.

Skills

VoIP stack familiarity

SIP/RTP knowledge

Linux terminal

Networking fundamentals

AWS/cloud experience

Packet capture analysis

Tools

FreeSWITCH

Kamailio

OpenSIPS

Asterisk

Job description

About the role

We're looking for a VoIP engineer to build, run, and debug our telephony infrastructure. You'll work hands‑on with our SIP servers, call flows, and the cloud infrastructure they run on from provisioning a new SIP proxy to tracing a one‑way‑audio complaint down to a specific RTP stream. Calls either connect and sound good, or they don't, and you'll own that outcome end to end.

What you'll do

• Build and operate the telephony stack
• Set up and maintain VoIP nodes SIP proxies, PBX, media servers — and wire them into a resilient stack
• Configure dialplans, routing logic, and call flows (IVR, transfers, forking, recording, conferencing)
• Manage carrier and SIP trunk connectivity: registrations, DIDs, number routing, failover between providers
• Configure supporting services — SSH, web servers, reverse proxies, process managers

Debug and improve call quality

- Investigate call failures and quality issues: SIP signaling errors, registration problems, NAT traversal, codec negotiation, one‑way audio, jitter, packet loss

- Take and read packet captures (tcpdump, Wireshark, sngrep) and correlate them with logs to trace a call end to end

- Track quality metrics (MOS, ASR, ACD, latency) and drive them in the right direction

- Write up root‑cause analyses so the same failure doesn't recur

Own the cloud infrastructure

- Deploy and manage AWS infrastructure: VPCs, subnets, route tables, security groups, EC2, Elastic IPs

- Handle firewall rules, port management, and DNS for SIP and RTP traffic

- Set up monitoring, alerting, and logging so problems are caught before customers report them

- Contribute to upgrades, capacity planning, and incident response

Work with the team

- Partner with backend engineers on telephony APIs, webhooks, and call‑event handling

- Support customer‑facing teams on escalated call issues with evidence‑backed explanations

- Document configurations, runbooks, and troubleshooting guides

Must‑haves

• Familiarity with any telephony/VoIP stack (FreeSWITCH, Kamailio, OpenSIPS, Asterisk, or similar)
• Working understanding of SIP and RTP: call setup, registration, common response codes, media negotiation
• Comfortable in a Linux terminal (systemd, logs, permissions, basic shell scripting)
• Basic networking knowledge — NAT, firewalls, ports, DNS, TCP/UDP
• Experience with AWS or a comparable cloud/VPC platform
• Ability to procure and read packet captures and logs to trace a call end to end

Clear written communication