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Enterprise SIP Trunking

Enterprise SIP Trunking.
Built for Scale.

Reliable, carrier-grade SIP trunking for businesses of all sizes — integrating seamlessly with Microsoft Teams Direct Routing, Zoom Phone and your existing PBX infrastructure.

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What Are SIP Trunks?

The backbone of
enterprise voice connectivity

SIP (Session Initiation Protocol) trunks replace traditional ISDN and analogue phone lines with a flexible, internet-based connection to the public telephone network (PSTN) — giving your business scalable, cost-effective calling.

GenNet provides carrier-grade SIP trunks that connect directly to Microsoft Teams via Direct Routing, Zoom Phone, Cisco, Avaya and virtually any SIP-compatible PBX or UCaaS platform.

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Cost Savings
Replace expensive ISDN lines — SIP trunks typically reduce call costs by 30–60% for most businesses.
Reliability & Redundancy
Dual-carrier architecture with automatic failover ensures your voice services stay up even if one path fails.
Instant Scalability
Add or remove channels in minutes — no physical line installation, no waiting weeks for ISDN provisioning.
Universal Compatibility
Works with Microsoft Teams Direct Routing, Zoom Phone, Cisco, Avaya, 3CX and most SIP PBX systems.
Platform Capabilities

Everything you need
in an enterprise SIP service

Local & National Calling

Full Australian PSTN connectivity — local, national and 1300/1800 numbers with competitive call rates and no per-minute surprises.

  • Local geographic numbers
  • National 1300 and 1800 numbers
  • Bundled call plans available
  • International calling optional
  • Transparent billing

Number Porting

Keep your existing phone numbers — we handle the porting process end to end, including scheduling and cutover coordination.

  • Full number porting service
  • Geographic and 13/1300/1800
  • Cutover planning and scheduling
  • Test calls before go-live
  • Temporary number fallback option

Failover & Redundancy

Business continuity built in — automatic failover to backup carriers and configurable disaster recovery routing for critical services.

  • Dual-carrier architecture
  • Automatic failover routing
  • Disaster recovery call diversion
  • SLA-backed availability
  • 24/7 network monitoring

UCaaS & PBX Integration

Connects directly with the platforms your business already uses — from Microsoft Teams to Zoom Phone and legacy PBX systems.

  • Microsoft Teams Direct Routing
  • Zoom Phone SIP integration
  • Cisco, Avaya, 3CX compatible
  • Session Border Controller support
  • Hybrid PBX migration support
Why Choose GenNet

Your SIP trunking partner
from day one

We don't just provision SIP trunks — we design, implement and support your entire voice connectivity solution.

End-to-End Delivery

GenNet manages the full process — from network design and number porting to SBC configuration and go-live testing.

Teams Direct Routing Experts

We're certified for Microsoft Teams Direct Routing — the most common use case for SIP trunks in modern workplaces.

Carrier-Grade Infrastructure

GenNet's SIP trunks run on redundant, Australian-hosted infrastructure — not a resold overseas service with hidden latency.

Competitive Pricing

We provide transparent pricing with no hidden fees — bundled call plans and competitive per-minute rates for all call types.

Migration Support

Moving from ISDN? We plan and execute the full migration — minimising disruption and ensuring your existing numbers follow you.

Ongoing Support

Australian-based technical support — for your SIP trunks, your PBX integration and any calling issues that arise over time.

Ready to replace
your ISDN lines?

Contact GenNet today for a free SIP trunking assessment and quote for your business.

Call 1800 GENNET Request a Callback