SIP Trunking: A Guide for MSPs & Resellers

As a Managed Service Provider (MSP) or broadband reseller, you're always on the lookout for ways to expand your product range and boost business growth.

But have you considered offering SIP Trunking services?

Demand for cost-effective SIP solutions is only increasing. The global SIP Trunk market is projected to grow at 13.75%per year to $255 Billion (USD) by 2034. Australian MSPs and resellers can expect SIP to be a key product for many years to come.
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What is SIP Trunking?

Let’s start with the basics. ‘SIP’ stands for Session Initiation Protocol – the name for the technology that enables voice calling over the internet. ‘Trunking’ is a way of connecting devices using the SIP technology.

SIP Trunking allows you to connect your client's phone systems to the public switched telephone network (PSTN) via the internet. SIP Trunking is the modern alternative to old-fashioned phone lines.

In Australia, the old-fashioned ISDN and TDM phone services were phased out as part of the nbn. All phone calls are now delivered over the internet.

SIP Trunking is a way of enabling this internet-based calling for businesses, opening up a new revenue opportunity for MSPs and business broadband providers.

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What are the benefits for MSPs & NBN providers?

By offering SIP Trunking, service providers can offer calling plans that will work for any IP-PBX, as well as Microsoft Teams and Webex. Voice services are a natural value-add for any business nbn or fibre service .

SIP is versatile and can be adapted to a wide range of customer needs. For example, you can configure SIP Trunks to work with your customers’ existing on-premise PBX phone systems, or offer your own white label Cloud PBX solution.

With Telcoinabox’s fully managed SIP Trunking service, you can deliver high quality voice services without the need to host your own SIP servers. Plus, our end-to-end carrier automation makes it easy to port, order, and provision phone numbers.

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What does SIP Trunking cost?

SIP Trunking plans are often better value than the standard calling plans available from the major telcos. We have seen many MSPs win customers away from popular services like Telstra DOT, TIPT, Optus Loop and BizPhone.

The other cost-saving benefit is that SMBs can operate their voice and data through their nbn or fibre connection. They don’t need to pay for separate phone and fax line rental, enabling seamless communication while reducing overhead costs.

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Can your clients keep their numbers?

Telcoinabox supports number porting, so your customers’ numbers stay the same when you switch them to SIP Trunking.

Service providers can also 'host' numbers on behalf of their customers, offering a reliable solution while earning recurring revenue. This makes it easier to manage phone services while providing ongoing value to your clients.

For more details on how number porting works, check out our Phone Numbers page.

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Will SIP Trunks work across different platforms?

If your customers are larger or have a mix of different communication platforms, SIP Trunks are a great way to thread all these services together.

For instance, a company using a 3CX phone system in one office and Teams Calling in another might have two different phone plans and providers. But you don’t need to convince your customers to give up one platform.

With SIP, you can provide your own calling plans for each of these platforms. You can take over the voice component – leaving your clients with their preferred mix of communication tools.

This is great news for your customers because they will feel more in control, and enjoy better rates, simplified management and support via one provider.

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How does SIP Trunking benefit remote teams?

With SIP Trunking, Service Providers can extend communication services to both in-office and remote workers. SIP works via fixed and mobile internet connections. It ensures seamless communication across locations, making it easier for businesses to manage team interactions, whether employees are at the office, working from home, or on the move.

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Why Telcoinabox is the Ideal Partner for MSPs

At Telcoinabox, we don’t just provide SIP Trunking—we empower MSPs with an entire ecosystem to deliver best-in-class services. From our intuitive portal for real-time provisioning to tailored support and flexible billing options, we give MSPs the tools to scale effortlessly and maximise their margins.

Whether you're helping clients with inbound or outbound calling, Telcoinabox ensures you stay ahead with industry-leading features and unmatched reliability.