Voip Engineer

2 weeks ago

Islamabad, Islamabad, Pakistan Ibix Global Tech Full time

Company Description

Ibix Global Tech specializes in AI-driven technologies, cybersecurity, IT infrastructure, and more to transform businesses worldwide. With a network of trusted partners, we deliver a range of IT services while offering our own innovative IT solutions. Ibix Global Tech is committed to reshaping digital excellence for enterprises and promotes continuous technological advancements. Discover how we're changing the landscape of digital innovation on our website

Role Description

We are seeking a results-driven and technically adept VoIP Engineer with 2–5 years of hands-on experience in the design, deployment, and optimization of enterprise-grade VoIP solutions. The ideal candidate will have deep expertise in SIP trunk configuration, Session Border Controller (SBC) deployment, IP PBX management, and troubleshooting complex VoIP environments.

Key Responsibilities:

  • Configure and manage SIP trunks with major service providers, including registration, authentication, and NAT traversal
  • Deploy, secure, and maintain Session Border Controllers (SBCs) for call routing, media handling, and NAT traversal
  • Install, configure, and manage IP PBX platforms such as Grandstream UCM, Yeastar S-Series, 3CX v20+, and Asterisk FreePBX
  • Design and implement call routing logic and dial plans, including digit manipulation, time conditions, and failover rules
  • Ensure Quality of Service (QoS) for VoIP traffic using traffic shaping, prioritization, and network optimization techniques
  • Integrate VoIP systems with PSTN gateways, legacy PBXs, IP phones (Yealink, Cisco, Grandstream), softphones (Zoiper, Bria), and WebRTC solutions
  • Conduct deep-dive diagnostics and packet-level analysis using tools such as Wireshark and sngrep
  • Monitor, troubleshoot, and resolve VoIP call issues through log analysis, CDRs, and SIP trace interpretation
  • Deliver documentation and training to internal IT teams and end-users on VoIP systems and best practices.

Requirements:

  • Solid knowledge of SIP, RTP, SRTP, and T.38 (FoIP) protocols.
  • 2 - 5 years of experience as an Engineer providing VoIP Solutions.
  • Proven experience with IP PBX platforms (Grandstream, Yeastar, 3CX v20+, Asterisk/FreePBX)
  • Experience configuring and securing SBCs in a production environment
  • Proficiency in dial plan creation, call flow design, and number normalization (E.164 formatting)
  • Familiarity with VoIP quality assurance, traffic shaping, and QoS configuration
  • Hands-on skills in packet capture and analysis using Wireshark, sngrep, and similar tools.
  • Open for traveling internationally.

Preferred/Plus Experience:

  • Networking fundamentals including switching, VLANs, NAT, and routing.
  • Experience with cloud-based voice platforms such as Avaya Cloud Office and Cisco Webex Calling / CUCM Cloud
  • Exposure to VoIP integrations with AWS and Microsoft Azure environments

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