# SIP Trunks

**Category:** SIP Trunking
**URL:** https://www.simtex.com.au/products/sip-trunks

Reliable SIP trunking for your existing PBX system

## Key Statistics

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

## Overview

Connect your on-premise PBX to our carrier-grade SIP network. Reduce costs, increase reliability, and gain flexibility. Compatible with all major PBX systems including 3CX, FreePBX, Asterisk, Yeastar, Grandstream, and UniFi.

## How SIP Trunks Compares

Simtex SIP Trunks provide pay-per-channel SIP trunking for businesses operating their own PBX or IP-PBX platform. Pricing starts at $4.99 per channel per month, with channel counts scaling from 2 to 200 or more on a single trunk. The service is delivered from geo-redundant points of presence in Perth and Sydney, with automatic failover between sites and a 99.99% uptime SLA. When evaluating SIP trunk providers in Australia, Simtex is distinguished by operating its own carrier infrastructure rather than reselling capacity. Calls terminate directly on the Simtex network, which reduces hop count, simplifies fault diagnosis, and removes the wholesale margin layered into reseller offerings. The trunks are tested and documented against the major PBX platforms used in the Australian market, including 3CX, FreePBX, Asterisk, Yeastar, Grandstream, UniFi Talk, and other SIP-compliant systems. Configuration guides cover registration-based and IP-authenticated trunk topologies. Numbers can be supplied new from the Simtex range or ported from any Australian carrier. Simple Category A ports typically complete in 10 business days, with a temporary number issued during the cutover window so service is uninterrupted. Complex Category C ports of ISDN blocks complete in 4 to 6 weeks. Inbound 1300 and 1800 numbers can be attached to the same trunk. Compared with reseller SIP trunk providers such as Vonex, Maxotel, SIPTalk, and Intelephony, Simtex provides direct carrier ownership and AU-based engineering support. Compared with Telstra Business SIP Connect and iiNet Business SIP, Simtex pricing at $4.99 per channel undercuts incumbent bundled-channel rates while retaining geo-redundancy and a managed porting path. The same trunks can extend into Microsoft Teams via Simtex's Teams Direct Routing service on the same carrier network.

## 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.

- 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

### 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.

- Billed to the exact second on every call
- No flagfall or minimum call charges
- Real-time cost visibility in your portal
- Typically saves 20–30% vs per-minute billing

### No Lock-In Contracts

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

- No minimum contract terms
- No early termination fees
- Scale services up or down same-day
- Cancel anytime with no penalties

### 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.

- Automatic tiered pricing — no negotiation required
- Discounts applied across your entire account
- Published, transparent volume tiers
- Savings scale as your business grows

### 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.

- Less than 53 minutes unplanned downtime per year
- Automatic service credits — no claims process
- 24/7 network monitoring and incident response
- Contractual guarantee, not a marketing number

### G.711 & G.729 Codecs

Support for industry-standard voice codecs

- G.711 high quality
- G.729 bandwidth efficient
- Automatic codec selection
- Network optimized

### Failover Routing

Automatic call rerouting when primary destination is unavailable

- Automatic failover
- Multiple backup destinations
- Business continuity
- Zero downtime

### Number Porting

Keep your existing phone numbers when you switch

- Any Australian carrier
- We handle everything
- Minimal downtime
- Keep your identity

### Call Analytics

Detailed reporting and insights on your call activity

- Comprehensive dashboards
- Real-time monitoring
- Export reports
- Team productivity tracking

## 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](/products/1300-1800-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.

## Pricing Plans

| Plan | Price | Description |
|------|-------|-------------|
| TrunkPAYG | $4.99/channel | Pay as you go SIP trunking |
| TrunkEssentials | $14.95/channel | Unlimited local & national |
| TrunkPlus | $35.00/channel | Unlimited local, national & mobile |
| TrunkMax | $42.00/channel | Included everything, no bill shock |

## Technical Resources

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

- [PBX Configuration Guides](/support/kb/pbx-setup-guides): Step-by-step setup for Cisco, Avaya, Asterisk, 3CX, FreePBX, and more.
- [Network Requirements](/support/kb/general/firewall-rules): Bandwidth, QoS, and firewall configuration for optimal call quality.
- [Troubleshooting](/support/kb): Common SIP issues, registration problems, and audio troubleshooting.

## 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 Platform | Configuration Guide |
| --- | --- |
| Asterisk (raw) | [Asterisk PJSIP configuration guide](/support/kb/pbx-setup-guides/pjsip-configuration-asterisk) |
| FreePBX / Asterisk GUI | [FreePBX 17 PJSIP setup guide](/support/kb/pbx-setup-guides/freepbx-17-sip-trunk-configuration) |
| 3CX v20 | [3CX SIP trunk configuration guide](/support/kb/pbx-setup-guides/3cx-sip-trunk-configuration) |
| FusionPBX / FreeSWITCH | [FusionPBX configuration guide](/support/kb/pbx-setup-guides/fusion-pbx-sip-trunk-configuration-guide) |
| Cisco Unified Communications Manager (CUCM/CCM) | [Cisco CUBE configuration guide](/support/kb/pbx-setup-guides/cisco-cube-configuration) |
| Avaya IP Office | [Contact Simtex for assisted configuration](/contact) |
| IPECS (Ericsson-LG) | [Contact Simtex for assisted configuration](/contact) |
| Panasonic NS/NSX Series | [Contact Simtex for assisted configuration](/contact) |
| Yeastar P-Series | [Yeastar P-Series configuration guide](/support/kb/pbx-setup-guides/yeastar-p-series-sip-trunk-configuration) |
| Yeastar S-Series | [Yeastar S-Series configuration guide](/support/kb/pbx-setup-guides/yeastar-s-series-sip-trunk-configuration) |
| Grandstream UCM | [Grandstream UCM configuration guide](/support/kb/pbx-setup-guides/grandstream-ucm-sip-trunk-configuration) |
| NEC PBX | [Contact Simtex for assisted configuration](/contact) |

## 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

### Multi-site retailer consolidates voice

> "We had separate phone systems and carriers at each of our 12 stores. Now everything runs through one SIP trunk with local breakout. Management is simpler and we're saving thousands each month."
> — Rachel Nguyen

- **$4,200** monthly savings

## SIP Trunk Questions

**Q: How much does a SIP trunk cost in Australia?**

A: 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.

**Q: How many SIP trunk channels do I need?**

A: A SIP trunk channel is one simultaneous call path. As a general guide, a business with 10 staff typically needs 4-6 channels for comfortable concurrent call capacity. Simtex trunks start at 2 channels and scale to 200 channels on a single trunk. Additional channels can be added to an existing trunk the same day with no interruption to service.

**Q: Is Simtex SIP trunking compatible with my PBX?**

A: Simtex SIP trunks work with most business PBX platforms including Asterisk, FreePBX, 3CX, FusionPBX, Cisco Unified Communications Manager, Avaya IP Office, IPECS, Panasonic, Yeastar, and NEC systems. Step-by-step configuration guides are available in our knowledge base for the most common platforms. For other systems, our support team can assist with configuration.

**Q: Can I use Simtex SIP trunks over NBN?**

A: Yes. Simtex SIP trunks run over any business broadband connection, including NBN fibre and fixed wireless. You do not need dedicated phone lines. For best call quality, we recommend a connection with at least 100 kbps upstream per simultaneous call and a router that supports QoS (Quality of Service) to prioritise voice traffic.

**Q: Can I port my existing phone numbers to Simtex SIP trunks?**

A: Yes. Simtex can port single landline numbers, ISDN number blocks (including blocks of 100), and 1300/1800 numbers from most Australian carriers. Standard single-number ports typically complete within 5-10 business days. ISDN block ports take longer depending on the originating carrier. Your existing service remains active throughout the porting process.

**Q: What is the difference between a SIP trunk and a hosted PBX?**

A: A SIP trunk connects your existing on-premises or cloud PBX to the telephone network — you keep your PBX hardware or software and replace only the phone lines. A hosted PBX replaces both the lines and the PBX itself with a fully managed cloud service. If you already have a PBX you are happy with, SIP trunking is typically the more cost-effective option. See [Simtex Cloud PBX](/products/cloud-pbx) if you are looking to replace your PBX as well.

## Ready to modernise your phone lines?

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

- [Sign Up Now](https://account.zettagrid.com/catalog/voice/voip/siptrunk)
- [Get a Custom Quote](/contact)

## Pricing Plans

| Plan | Price | Description |
|------|-------|-------------|
| TrunkPAYG | $4.99/channel | Pay as you go SIP trunking |
| TrunkEssentials | $14.95/channel | Unlimited local & national |
| TrunkPlus | $35.00/channel | Unlimited local, national & mobile |
| TrunkMax | $42.00/channel | Included everything, no bill shock |

## Learn More

- Product page: https://www.simtex.com.au/products/sip-trunks
- All products: https://www.simtex.com.au/products
- Contact us: https://www.simtex.com.au/contact
- Full AI reference: https://www.simtex.com.au/llms-full.txt
- Site AI summary: https://www.simtex.com.au/llms.txt