Asterisk & VoIP Systems Engineer

Turkcell Global Bilgi; Fatih; On-site; TRY 400,000 - 640,000; Full time

Job summary

Turkcell Global Bilgi seeks a Senior Asterisk & VoIP Systems Engineer to lead design, deployment, integration, and operation of Enterprise PBX, Call Center, and UC platforms. You will implement Pure Asterisk, manage RBAC and HA, and automate operations.

The role requires hands-on production Asterisk experience, strong Linux scripting, and proficiency with SIP, ARI/AMI, and network issues. On-call and cross-team collaboration are expected.

Qualifications

• Hands-on experience with Pure Asterisk in production environments.

Responsibilities

• Manage installation, configuration, operation, integration, and support of Enterprise PBX, Call Center, and UC platforms.
• Design, deployment, development, integration, and operation of systems on Pure Asterisk.
• Develop CRM/ERP integrations using Dialplan, AGI, AMI, ARI.
• Compile Asterisk from source; manage modules, patching, upgrades, migrations.
• Manage Asterisk Realtime Architecture (ARA) and DB integrations.
• Configure and integrate SIP Trunks, SBCs, FXO/FXS/PRI Gateways.
• Deploy Kamailio/OpenSIPS for SIP proxy/routing.
• Perform packet-level RCA with Wireshark, tcpdump, sngrep.
• Troubleshoot VoIP: jitter, loss, latency, audio issues, RTP, DTMF."
• Manage RHEL/Linux servers; fix system/service/resource/logging/perf issues.
• Develop ops tools with Bash; Python/ PHP/ C as needed.
• Support Java/Tomcat apps; troubleshoot JVM issues.
• Centralized logging with Elasticsearch; monitor with Zabbix/SolarWinds.
• Contribute to HA/DR, load balancing, and failover.
• Troubleshoot TCP/IP/DNS/VLAN/NAT/QoS for VoIP.
• Work with MySQL/PostgreSQL; support Azure DevOps/TFS deployments.
• End-to-end RCA across app, system, network, DB, VoIP layers.
• Participate in Incident/Problem/Change Mgmt; create runbooks/docs.
• Collaborate with Software/DevOps/Net/Telecom teams to resolve issues.

Skills

Pure Asterisk

VoIP

SIP/SDP/RTP

Dialplan/AMI/ARI

Linux Bash

Scripting (Python/ PHP/ C)

JVM/ Tomcat

Documentation

Education

Bachelor's in CS/Software Eng/Telecom

5+ years Asterisk-based PBX/VoIP

dCAP or Sangoma/Asterisk certs (preferred)

CCNA/CCNP Collaboration

RHCSA/RHCE / LPIC (plus)

Tools

Docker

Kubernetes

Elasticsearch

Zabbix

SolarWinds

Job description

Job Description

We are looking for a Senior Asterisk & VoIP Systems Engineer to play a key role in the development, integration, operation, and technical support of Enterprise PBX, Call Center, and Unified Communications platforms.

This position involves managing application and infrastructure layers, performing end-to-end technical analysis and Root Cause Analysis (RCA), operating highly available systems, and developing operational automation.

Please Note: This is not a GUI-focused PBX administration role (FreePBX, Issabel, Elastix, etc.). Hands-on experience with Pure Asterisk in production environments is required.

Responsibilities

• Manage installation, configuration, operation, integration, and technical support of Enterprise PBX, Call Center, and Unified Communications platforms.
• Participate in the design, deployment, development, integration, and operation of systems running on Pure Asterisk.
• Develop CRM, ERP, and internal application integrations using Dialplan, AGI, AMI, and ARI.
• Compile Asterisk from source and manage modules, patching, upgrades, and migrations.
• Manage Asterisk Realtime Architecture (ARA) and database integrations.
• Configure and integrate SIP Trunks, SBCs, and FXO/FXS/PRI Gateways.
• Manage SIP/VoIP integrations with telecom operators and ITSPs.
• Deploy and operate Kamailio/OpenSIPS for SIP proxy and routing requirements.
• Perform packet-level analysis and RCA using Wireshark, tcpdump, and sngrep.
• Troubleshoot VoIP issues including jitter, packet loss, latency, one-way/no-way audio, RTP, codec negotiation, DTMF, and call setup failures.
• Manage Red Hat Enterprise Linux / Linux servers and troubleshoot system, service, resource, logging, and performance issues.
• Develop operational tools and automation using Bash/Shell, with Python, PHP, or C where required.
• Support Java/Tomcat-based applications and troubleshoot related application and JVM issues.
• Manage centralized logging and analysis using Elasticsearch.
• Monitor systems and applications using Zabbix, SolarWinds, and similar tools.
• Contribute to Load Balancing, High Availability, failover, and Disaster Recovery activities.
• Troubleshoot network and VoIP issues involving TCP/IP, DNS, TCP/UDP, NAT, VLAN, routing, and QoS.
• Work with MySQL/PostgreSQL databases and support Azure DevOps / TFS-based deployment and release processes.
• Perform end-to-end troubleshooting and RCA across application, system, network, database, and VoIP layers.
• Take an active role in Incident, Problem, and Change Management processes.
• Prepare and maintain technical documentation, troubleshooting guides, and runbooks.
• Collaborate with Software, DevOps, System, Network, and Telecom teams to resolve critical technical issues.

Qualifications

Technical Competencies (Core Requirements)

• Proven hands-on experience in Telecommunications, VoIP, Enterprise PBX, or real-time communication systems.
• Advanced hands-on experience with Pure Asterisk in production environments.
• Experience with high-availability Asterisk architectures, failover, SIP trunk redundancy, and Disaster Recovery.
• In-depth expertise in Dialplan, AGI, AMI, ARI, and Asterisk Realtime Architecture (ARA).
• Strong understanding of SIP, PJSIP, SDP, and RTP/RTCP.
• Hands-on experience with PJSIP/res_pjsip, including endpoint, AOR, authentication, identify, and transport configuration.
• Hands-on experience with SIP Trunks, SBCs, and FXO/FXS/PRI Gateways.
• Experience with Asterisk CDR/CEL, call records, and call-flow analysis.
• Strong understanding of SIP signaling, call flows, SIP response codes, and SDP negotiation.
• Experienced in Red Hat Enterprise Linux / Linux system administration and proficient in Bash/Shell scripting.
• Strong command of TCP/IP, DNS, UDP, NAT, VLAN, routing, and QoS for VoIP troubleshooting.
• Hands-on experience with packet-level analysis (sngrep, tcpdump, Wireshark) and systematic RCA.

Education & Certifications

• Bachelor's degree in Computer Science, Software Engineering, Telecommunications Engineering, Electronics & Communication Engineering, Electrical & Electronics Engineering, or a related field.
• 5+ years of hands-on experience designing, developing, and operating high-traffic Asterisk-based PBX, Call Center, or VoIP platforms.
• dCAP (Digium Certified Asterisk Professional) or current Sangoma/Asterisk certifications are preferred.
• CCNA / CCNP Collaboration or similar Network/VoIP certifications are a plus.
• RHCSA / RHCE / LPIC or similar Linux certifications are a plus.

Nice-to-Have Skills

• SIP/VoIP integration experience with telecom operators and ITSPs.
• Advanced hands-on experience with SBC products.
• Advanced SIP routing experience with Kamailio or OpenSIPS.
• Knowledge of Docker and Kubernetes.
• Experience with SIP/RTP/WebRTC based real-time communication platforms.
• Experience with Apache Tomcat and Java-based applications.
• Knowledge of JVM and application performance tuning.
• Experience with Elasticsearch and centralized logging.
• Experience with Zabbix, SolarWinds, or similar monitoring tools.
• Familiarity with Azure DevOps / TFS and release processes.
• Experience with MySQL and/or PostgreSQL.
• Knowledge of TLS/SRTP, iptables, and fail2ban.
• Strong analytical thinking and problem-solving skills.
• Ability to perform systematic analysis and RCA on complex technical issues.
• Ability to analyze relationships between application, system, network, database, and VoIP layers.
• Comfortable working in critical, high-availability, 24/7 environments.
• Effective communication and coordination skills across technical teams.
• Strong technical documentation and knowledge-sharing skills.
• Professional working proficiency in technical English.
• Willingness to participate in an on-call rotation when required.