SIP Trunks Built for Business

Enterprise-grade SIP connectivity with transparent pricing. No hidden fees, no surprises. Just reliable voice over your existing infrastructure.

2-200
Channels per Trunk
100%
Australian Network
$0
Setup Fees

Features

Everything you need from your SIP Trunks solution

Geo-Redundant Infrastructure

Multiple data centres across Australia ensure your calls always connect. If one site goes down, traffic automatically routes through another — no intervention needed.

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Per-Second Billing

Pay only for the seconds you use. No rounding up to the nearest minute — every call is billed to the exact second.

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No Lock-In Contracts

Month-to-month flexibility with no minimum terms. Scale up or down as your business needs change — cancel anytime.

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Geo-Redundant Infrastructure

core

Multiple data centres across Australia ensure your calls always connect. If one site goes down, traffic automatically routes through another — no intervention needed.

Your voice infrastructure runs across geographically separated data centres in Perth, Sydney and Melbourne, with additional points of presence for peering and interconnection. Every component — SBCs, media gateways, signalling servers — is fully redundant across sites. If an entire data centre goes offline, calls automatically route through the surviving site with no perceptible interruption. There is no single point of failure in the call path, from your handset to the PSTN. This is not disaster recovery you have to invoke manually. Failover is automatic, sub-second, and tested continuously. Your calls keep flowing while we handle the infrastructure.
Dual data centres in Perth and Sydney
Automatic sub-second failover
No single point of failure in the call path
Continuous failover testing — no manual invocation

Bulk Channel Discounts

Volume pricing that rewards growth. The more channels you run, the lower your per-channel cost — with savings that scale alongside your business.

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99.99% Uptime SLA

Carrier-grade reliability backed by a published service level agreement. Less than 53 minutes of downtime per year — with service credits if we miss it.

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G.711 & G.729 Codecs

Support for industry-standard voice codecs

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Failover Routing

Automatic call rerouting when primary destination is unavailable

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Number Porting

Keep your existing phone numbers when you switch

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Call Analytics

Detailed reporting and insights on your call activity

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Australian SIP Trunking — NBN Compatible

Simtex SIP trunks connect your existing PBX to the Australian telephone network over an internet connection, replacing traditional ISDN or analogue lines at a fraction of the cost. Whether your office has recently migrated to NBN or is planning to do so, SIP trunking is the natural next step: your phone numbers stay the same, your PBX stays in place, and your call costs typically drop significantly.

SIP Trunks, a breeze

  • NBN compatible — SIP trunks use your existing broadband; no dedicated phone lines required
  • ISDN equivalent call capacity — each channel carries one simultaneous call; scale from 2 to 200 channels on a single trunk
  • Same-day provisioning — additional channels can be added to an existing trunk in minutes, with no physical installation
  • Keep your existing numbers — Simtex can port single numbers, ISDN number blocks, and 1300 and 1800 numbers from most Australian carriers
  • Geo-redundant Australian infrastructure — calls route across server farms in Perth, Sydney, and Melbourne with automatic failover

100% Australian Network

Simtex is an Australian VoIP provider. Our SIP infrastructure is hosted in Australian data centres, operated by Australian staff. Calls originating and terminating in Australia stay on the Simtex network without traversing overseas routes, which reduces latency and improves call quality on Australian numbers. Support is handled by engineers based in Australia.

Choose Your Plan

Flexible pricing to match your business needs

Budget

TrunkPAYG

Pay as you go SIP trunking

$4.99
/channel (line)

Call Rates

  • Local/National$0.0314/min
  • Mobile$0.0890/min
  • 13/1300$0.3244/call
Get Started

TrunkEssentials

Unlimited local & national

$14.95
/channel (line)

Min. 2 channels/lines

Call Rates

  • Local/NationalIncluded
  • Mobile$0.0890/min
  • 13/1300$0.3244/call
Get Started
Most Popular

TrunkPlus

Unlimited local, national & mobile

$35.00
/channel (line)

Min. 2 channels/lines

Call Rates

  • Local/NationalIncluded
  • MobileIncluded
  • 13/1300$0.3244/call
Get Started
Premium

TrunkMax

Included everything, no bill shock

$42.00
/channel (line)

Min. 2 channels/lines

Call Rates

  • Local/NationalIncluded
  • MobileIncluded
  • 13/1300Included
Get Started

All prices are in AUD and include GST. Additional call rates may apply.

Technical Resources

Everything you need to connect your PBX to our SIP network.

PBX Compatibility

Simtex SIP trunks have been tested and documented for use with many different platforms, including but not limited to, the following. Configuration guides are linked where available.

PBX PlatformConfiguration Guide
Asterisk (raw)Asterisk PJSIP configuration guide
FreePBX / Asterisk GUIFreePBX 17 PJSIP setup guide
3CX v203CX SIP trunk configuration guide
FusionPBX / FreeSWITCHFusionPBX configuration guide
Cisco Unified Communications Manager (CUCM/CCM)Cisco CUBE configuration guide
Avaya IP OfficeContact Simtex for assisted configuration
IPECS (Ericsson-LG)Contact Simtex for assisted configuration
Panasonic NS/NSX SeriesContact Simtex for assisted configuration
Yeastar P-SeriesYeastar P-Series configuration guide
Yeastar S-SeriesYeastar S-Series configuration guide
Grandstream UCMGrandstream UCM configuration guide
NEC PBXContact Simtex for assisted configuration

Customer Success Stories

See how businesses are modernising their voice infrastructure with SIP Trunking.

Contact centre handles 3x call volume

Our ISDN lines were maxed out and quotes for more were astronomical. Simtex SIP trunks gave us unlimited capacity at a fraction of the cost. We handled our busiest season ever without a single busy signal.

David Park

300%increase in call capacity

SIP Trunk Questions

Simtex SIP trunk plans start from $4.99 per channel per month on the pay-as-you-go TrunkPAYG plan. Unlimited local and national calling is available from $14.95 per channel per month. There are no setup fees and no minimum contract terms on standard plans. Pricing is per channel — each channel supports one simultaneous call.

Ready to modernise your phone lines?

Replace legacy ISDN and analogue lines with SIP trunks. Lower costs, better features, instant scalability.

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