Professional Guides

VANTAGE ARS — VoIP, Networking & IT Infrastructure

Pragmatic engineering for South African businesses. Secure voice, resilient networks, and practical fixes that work in the field.

Our Services

VoIP & SIP Trunking

Interoperability, NAT traversal, QoS, failover, and carrier-grade troubleshooting.

Networking & Wi‑Fi

Mikrotik, routing, VLANs, firewalls, and performance tuning for SMBs.

Security & CCTV

Hikvision, access control, segmentation, and hardening with minimal friction.

IT Support & Infrastructure

3rd-line support, PBX migrations, documentation, and SLA-aligned operations.

Latest guides

VoIP Network Setup for Small Offices: VLANs, QoS and the Firewall Settings That Break Calls

2026-09-28

A practical guide to getting a small office network ready for VoIP: bandwidth targets, voice VLANs, QoS markings, DHCP provisioning and the three firewall settings that break calls.

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SIP Trunking Setup: What Actually Goes Wrong (And How to Fix It)

2026-09-28

A VoIP network engineer's honest breakdown of the SIP trunking failures that actually show up in support calls — one-way audio, registration drops, NAT issues — and how to fix each one.

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