# IT Network Engineer - PBX

> CallTek · Cebu City, Philippines · Full-time · Posted 2026-09-29

**Workplace:** on_site

## Description

-   Perform configuration and maintenance of PBX Systems. Including installation and configuration of softphones, managing User Accounts, Creation/Deletion of Queues/Flows, DIDs/TFNs, Extensions, Voicemails etc.
-   Carry out Flows/IVRs and Call Routing design and implementation.
-   Monitor network performance.
-   Troubleshoot Network Infrastructure issues.
-   Provide technical support to end users, resolving hardware and software issues efficiently.
-   Diagnose problems, implement solutions, and escalate as necessary.
-   Maintain documentation of common problems and solutions.
-   Maintain service level agreements (SLA).
-   Handle routine system maintenance (network/software/PBX)
-   Participate in backup testing, business continuity, and recovery drills.
-   Log ticket issues and document relevant information to come up with a resolution.
-   Work with Security and Compliance to ensure IT infrastructure compliance with organizational policies, procedures, and industry standards.
-   Collaborate with other teams – Corporate Connectivity, Managed Services, Engineering, Security, and Compliance
-   Help identify opportunities for process improvement, recommendations, upgrades, or new technologies
-   Able to stay current with industry trends and best practices to enhance operational efficiency

## Requirements

-   IT / Computer Science-related degree or certification.
-   Knowledge in SIP, RTP and WebRTC, including voice codecs to optimize audio quality.
-   Knowledge in Zoom Phone and Zoom Contact Center, Mitel, Vanilla Asterisk and other Asterisk based PBX Systems.
-   Proficient in configuring, Flows, Routing, Integrations etc. This includes scripting and APIs.
-   Knowledge of SBC, MBG, and firewalls to secure voice networks, with a strong understanding of LAN/WAN routing and VLANs.
-   Knowledge in Mikrotik, Tailscale and Netskope is a plus.
-   Able to use Wireshark or other network packet tracer to diagnose call drops and SIP messages.
-   Strong problem-solving and analytical abilities.
-   Communication skills (technical and non-technical audiences).
-   Time management and ability to prioritize tasks.
-   Team collaboration and customer service orientation.
-   Adaptability and willingness to learn new technologies.
-   Attention to detail and documentation practices

## Apply

[Apply at CallTek](https://apply.workable.com/staff4me/j/809DEAFAB0/apply)

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