CallTek

White-label tech support, BPO, TaaS provider

IT Network Engineer - PBX

Network Engineering & AdministrationConfirmed live in the last 24 hours

Full-timeCebu City, PhilippinesNo salary listed

About the Job

Requirements

An IT- or Computer Science-related degree or certification is required.
Knowledge of Session Initiation Protocol (SIP), Real-time Transport Protocol (RTP), and WebRTC, including voice codecs to optimize audio quality.
Knowledge of Zoom Phone, Zoom Contact Center, Mitel, Vanilla Asterisk, and other Asterisk-based PBX systems.
Proficiency in configuring flows, routing, and integrations, including scripting and APIs.
Knowledge of session border controllers (SBC), MBG, and firewalls to secure voice networks, and a strong understanding of LAN/WAN routing and VLANs.
Ability to use Wireshark or another network packet tracer to diagnose call drops and SIP messages.
Strong problem-solving and analytical abilities.
Communication skills for 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.

Responsibilities

Configure and maintain PBX systems, including installation and configuration of softphones, management of user accounts, creation and deletion of queues and flows, management of DIDs/TFNs, extensions, and voicemails.
Design and implement flows/IVRs and call routing.
Monitor network performance.
Troubleshoot network infrastructure issues.
Provide technical support to end users by resolving hardware and software issues.
Diagnose problems, implement solutions, and escalate as necessary.
Maintain documentation of common problems and solutions.
Maintain service level agreements (SLAs).
Handle routine system maintenance for network, software, and PBX systems.
Participate in backup testing, business continuity, and recovery drills.
Log ticket issues and document relevant information to develop resolutions.
Work with Security and Compliance to ensure IT infrastructure complies with organizational policies, procedures, and industry standards.
Collaborate with Corporate Connectivity, Managed Services, Engineering, Security, and Compliance teams.
Identify opportunities for process improvement and recommend upgrades or new technologies.
Stay current with industry trends and best practices to enhance operational efficiency.

Desired Qualifications

Knowledge of Mikrotik, Tailscale, and Netskope.

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

About the Company

CallTek

White-label tech support, BPO, TaaS provider

CallTek provides white-label technical support and BPO services for technology operators and service providers, including field service, cloud monitoring, NOC, and business continuity delivered under a Technology as a Service model that covers infrastructure, procurement, and full lifecycle support. It serves MSPs and enterprise platforms such as Cradle Point, Cisco, Aruba, Ruckus, and Fortinet, offering 24/7 multi-channel, multi-language support. Key differentiators are a global workforce of over 7,000, nearly two decades of experience, and recognition as a top employer in the Philippines in 2023, with a vertical focus on hospitality, multi-family student housing, and healthcare. CallTek aims to help technology operators scale, maintain uptime, and provide reliable branded support across channels and languages.

Company size: 501-1,000
Company stage: Not listed
Total funding: Not listed
Headquarters: Irvine, CA
Founded: 2004

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