IP Telephony Engineer - 3CX /Avaya

Bits Secure IT Infrastructure LLC; Dubai; On-site; AED 240,000 - 360,000; Full time

Job summary

Bits Secure IT Infrastructure LLC seeks an experienced Unified Communications engineer to deliver enterprise IP telephony solutions using 3CX and Avaya across multiple customer sites in the UAE. The role requires hands-on configuration, troubleshooting, and customer-facing delivery with strong documentation discipline.

You will lead engineering efforts, coordinate with partners, and travel within the UAE as needed to ensure successful project delivery and customer acceptance.

Qualifications

• 4–6 years of engineering experience in enterprise IP telephony/UC delivery (3CX and Avaya).
• Delivery for external customers through systems integrators, MSPs, or project teams.
• Lead engineers or workstreams while remaining hands-on (configuration and troubleshooting).

Responsibilities

• Lead end-to-end UC delivery across multiple customers, technologies and sites.
• Configure, troubleshoot, and support unified communications platforms at customer sites.
• Produce professional documentation (HLD/LLD, BOQ, MOP, test plans, as-builts) and drive customer acceptance.

Skills

IP Telephony Delivery

Project Leadership

Customer Engagement

Troubleshooting

Education

Bachelor's degree or Diploma in Engineering/CS/Telecom

Tools

3CX

Avaya PABX / IP Office

Yeastar

Grandstream

Cisco CUCM

Microsoft Teams Phone

Ribbon/AudioCodes SBCs

Job description

3.1 Must Have – Unified Communications

• Strong, current hands‑on experience with 3CX, including customer implementation, configuration, and support.

• Practical experience with Avaya PABX / IP Office.

• Strong knowledge of PABX/IP-PBX, VoIP, and Unified Communications.

• Hands‑on expertise in SIP/SIP Trunking, including registration, dial plans, codecs, NAT traversal, and troubleshooting through logs/traces.

• Experience configuring IVR/Auto Attendant, Call Queues, Ring Groups, Call Routing, and Voicemail.

• Experience with IP phone provisioning and voice fault troubleshooting.

• Good understanding of voice‑supporting networks: TCP/IP, VLAN, DHCP, DNS, NAT, QoS, and firewall rules.

3.2 Must Have – Infrastructure Expertise

• Strong hands‑on expertise in at least one of the following areas, with working knowledge of the others:

  • Networking & Security: Routing & Switching, VLAN, STP/LACP, QoS, WAN/SD-WAN, IPsec/SSL VPN, Wireless, NAC, and NGFW.

  • Server & Identity: Windows Server, Active Directory, OU/GPO, DNS, DHCP, PKI, Replication, Hardening, and PowerShell.

  • Virtualization & Business Continuity: VMware/Hyper‑V, Clusters, SAN/NAS, RAID, Backup, Replication, DR, and Restore Testing.

  • Cloud & Hybrid: Microsoft 365, Azure, Entra ID, Identity & Security, Cloud Migrations, Governance, Teams Phone and Direct Routing.

3.3 Added Advantage

• 3CX and/or Avaya certification.

• Experience with Yeastar, Grandstream, Cisco CUCM, Microsoft Teams Phone, and SBCs such as Ribbon/AudioCodes.

• Experience with PRI/ISDN, Analogue Gateways, Call Recording, and Contact Centre solutions.

• Experience implementing and supporting multi-site and multi-tenant telephony solutions for enterprise customers.

Desired Candidate Profile

• 4-6 years of engineering experience, including at least 4 years of genuine hands‑on enterprise IP telephony/UC delivery using 3CX and Avaya.

• Substantial delivery for external customers at a systems integrator, MSP, service provider, OEM partner or project‑delivery organization. Internal-IT-only careers do not qualify.

• 2+ years leading engineers or project workstreams while remaining personally hands‑on (configuration, CLI, troubleshooting).

• Proven end‑to‑end delivery across multiple customers, technologies and sites, through to formal customer acceptance.

• Professional-standard technical documentation: HLD / LLD, BOQ, MOP, test plans and as-built records.

• Proven escalation and RCA leadership on complex faults.

• Clear written and spoken English; credible in front of customer stakeholders.

• Bachelor's degree or diploma in Engineering, Computer Science or Telecom, or equivalent demonstrable experience.

• Able to work independently at customer sites and willing to travel within the UAE.

• Willing to pass a live technical assessment — scenario discussion, whiteboard design, and hands‑on configuration and troubleshooting on real equipment.

Preferred certifications and attributes

3CX, Avaya, CCNP / CCIE, Fortinet NSE / FCP / FCSS, Microsoft, VMware VCP, Veeam, PMP or ITIL; UAE market experience; valid UAE driving licence; AMC / SLA managed‑services background