VoIP / Telephony Engineer (Onsite – Karachi, Pakistan)

2 weeks ago

Karachi Nazimabad, Pakistan 97 Solutions Full time 1,200,000 - 2,400,000 per year

We are seeking an experienced VoIP / Telephony Engineer to join our team and support multiple telephony projects for international clients.

The role requires deep expertise in Asterisk/FreePBX and FreeSWITCH, as well as hands-on experience with WebRTC/webphone integrations and call center environments.

Responsibilities

Project 1: Asterisk/FreePBX IVR System

  • Configure and maintain FreePBX with multiple extensions.
  • Implement IVR menus that route calls to the appropriate extensions.
  • Integrate and troubleshoot our proprietary webphone (WebRTC, SIP over WebSockets).

Project 2: Call Center (FreeSWITCH-based)

  • Deploy, configure, and optimize FreeSWITCH for large-scale call center operations.
  • Manage SIP trunks and call routing for high-volume call flows.
  • Ensure scalability, reliability, and call quality across distributed systems.

General Duties

  • Integrate and manage SIP trunks (Flowroute and others).
  • Monitor and troubleshoot VoIP traffic (SIP/RTP/WebRTC).
  • Configure STUN/TURN servers for WebRTC connectivity.
  • Optimize performance for high concurrency environments.
  • Maintain Linux servers (Debian/Ubuntu/CentOS).
  • Implement security best practices (fail2ban, TLS/SRTP, IP whitelisting).
  • Use tools like asterisk CLI, fs_cli, sngrep, tcpdump, and wireshark for debugging.

Required Skills & Experience

  • 3+ years of hands-on experience with Asterisk/FreePBX (dialplans, IVRs, queues, extensions).
  • Proven expertise in FreeSWITCH for large call center deployments.
  • Strong knowledge of SIP protocol, RTP, NAT traversal issues.
  • Experience integrating and troubleshooting WebRTC/webphones (SIP over WebSockets).
  • Solid Linux system administration skills.
  • Strong debugging and performance optimization skills in high-load VoIP environments.

Nice to Have

  • Experience with Kamailio/OpenSIPS for SIP load balancing.
  • Familiarity with call recording, reporting, and CRM integrations.
  • Knowledge of contact center solutions and workforce management tools.

Job Types: Full-time, Part-time, Contract

Application Question(s):

  • Describe your experience with Asterisk/FreePBX and IVR setup.
  • What's your experience with FreeSWITCH in high-volume call centers?
  • How have you integrated WebRTC or proprietary webphones with PBX systems?
  • What tools do you use to troubleshoot one-way audio or SIP call issues?
  • Have you worked with Flowroute or other SIP trunk providers?

Language:

  • English (Required)

Work Location: In person

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