Voip Engineer

Feeblo; Johannesburg; On-site; ZAR 400,000 - 600,000; Full time

Job summary

A leading company in Johannesburg is seeking an experienced VoIP Engineer to design and maintain high-performance VoIP and Unified Communications systems. The ideal candidate will have extensive knowledge in VoIP protocols, telephony infrastructure, and cloud-based solutions. Responsibilities include ensuring call quality, troubleshooting issues, and implementing security measures. This role offers an opportunity to work with cutting-edge technology in a dynamic environment.

Qualifications

• Deep expertise in SIP, RTP, VoIP protocols, and telephony infrastructure.
• Hands-on experience in cloud-based PBX systems and SBCs.
• Strong troubleshooting and analytical skills.

Responsibilities

• Design, deploy, and manage VoIP infrastructure (on-premises, hybrid, or cloud-based).
• Monitor call quality metrics and troubleshoot VoIP issues.
• Secure VoIP systems against vulnerabilities and ensure compliance.

Skills

SIP

RTP

VoIP protocols

telephony infrastructure

network protocols

QoS

VoIP security

troubleshooting

automation scripting

Education

3+ years of VoIP engineering or telecommunications experience

CompTIA Network+ or Security+

Tools

Wireshark

SIPp

tcpdump

Job description

We are seeking an experienced VoIP Engineer to design, implement, and maintain high-performance Voice over IP (VoIP) and Unified Communications (UC) systems . The ideal candidate will have deep expertise in SIP, RTP, VoIP protocols, and telephony infrastructure , along with hands-on experience in cloud-based PBX systems, session border controllers (SBCs), and contact center solutions .

You will be responsible for ensuring call quality, reliability, and security across our VoIP network while troubleshooting complex issues and optimizing performance. Strong knowledge of network protocols, QoS, and VoIP security best practices is essential.

Key Responsibilities

VoIP System Design & Implementation

• Design, deploy, and manage VoIP infrastructure (on-premises, hybrid, or cloud-based).
• Configure and optimize SIP trunks, PBX systems (Asterisk, FreePBX, Cisco CUCM, Avaya) .
• Implement session border controllers (SBCs) (AudioCodes, Ribbon, Oracle ACME).
• Integrate VoIP with Microsoft Teams, Zoom, or other UC platforms .
• Set up call routing, IVR, auto-attendants, and call recording solutions .

Network Performance & Troubleshooting

• Monitor call quality metrics (MOS, jitter, latency, packet loss) using tools like Wireshark, SolarWinds, or VoIPmonitor.
• Troubleshoot SIP signaling, RTP streams, and one-way audio issues .
• Optimize QoS (Quality of Service) for VoIP traffic across LAN / WAN.
• Diagnose and resolve echo, choppy audio, and registration failures .

Security & Compliance

• Secure VoIP systems against toll fraud, DDoS attacks, and SIP vulnerabilities .
• Implement encryption (SRTP, TLS) and firewall rules for VoIP traffic.
• Ensure compliance with emergency services (E911, Kari’s Law, RAY BAUM’S Act) .

Cloud & Hybrid VoIP Solutions

• Deploy and manage cloud PBX platforms (RingCentral, 8x8, Zoom Phone, Webex Calling).
• Migrate legacy telephony (TDM, PRI) to VoIP / SIP .
• Configure SBCs for hybrid cloud-PBX environments .

Automation & Scripting

• Develop scripts (Python, Bash) for bulk configurations and diagnostics .

Required Skills & Qualifications

Technical Skills

Core VoIP Technologies :

• SIP, RTP, RTCP, SDP, WebRTC

Networking & Protocols :

• TCP / IP, VLANs, QoS (DSCP, COS), VPN
• Wireshark, SIPp, tcpdump for VoIP analysis
• Microsoft Teams Direct Routing, Zoom Phone, Webex Calling
• Contact Center Solutions (Genesys, Five9, Amazon Connect)

Security & Compliance :

• VoIP firewall / NAT traversal (STUN, TURN, ICE)
• E911, HIPAA, PCI-DSS compliance

Soft Skills & Experience

• 3+ years of VoIP engineering or telecommunications experience .
• Strong troubleshooting and analytical skills .
• Ability to work with carriers, vendors, and cross-functional teams .
• Excellent documentation and communication skills .

Certifications (Preferred)

• CompTIA Network+ or Security+

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Engineer • Johannesburg, Gauteng, South Africa