International Calls on a VOIP System in Australia

This guide covers how international calling works on a hosted VOIP system, which plan structures save the most money for AU businesses with regular overseas call volume, and what to check before switching from a traditional plan.

How International Calls Work on VOIP

A hosted VOIP system routes calls over the internet to your provider's data centres, which then connect to the public phone network in the destination country. Because your provider has existing wholesale agreements with carriers in major countries, their per-minute cost for international calls is significantly lower than what a retail phone plan charges. That saving is partly passed to business customers through lower per-minute rates or included international minute bundles.

For calls to New Zealand, the United Kingdom, the United States, Canada, and most of Western Europe, many AU VOIP providers include a set number of international minutes per user per month on their standard business plans. Published VOIP rates for these destinations may be similar to Telstra's per-minute rates. Telstra currently lists Singapore and Hong Kong at 2 cents per minute, Japan fixed lines at 3 cents and mobiles at 15 cents, and South Korea fixed lines at 3 cents and mobiles at 5 cents, plus a 55-cent connection fee. International mobile pricing depends on the provider and destination: mobiles may cost the same as fixed lines, cost more, or be included in selected-country bundles.

Plan Structures for International Calling

Included International Minutes

Some AU VOIP providers bundle international minutes to a defined list of countries within the monthly plan cost. A typical bundle covers landline calls to NZ, UK, USA, Canada, and sometimes Singapore and Hong Kong at no additional charge per minute. If your business regularly calls these destinations, a bundle plan is usually cheaper than a per-minute plan even if the monthly rate is slightly higher. Check the country list carefully -- 'international minutes' means different things to different providers.

Per-Minute International Rates

If international calls are occasional rather than daily, a per-minute plan is usually better value. AU VOIP providers typically publish per-minute rate tables for all destinations. Compare these against your current phone bill's international call charges. Published rates vary materially by provider, destination and number type, and connection fees can affect the total cost. Compare current provider rate tables rather than relying on a generic 3 to 15 cent versus 20 to 60 cent range.

SIP Trunking for High-Volume International

If your business makes more than 500 international call minutes per month, SIP trunking with a wholesale international termination provider is worth investigating. SIP trunking connects your on-premises PBX (or hosted VOIP system) directly to a carrier's SIP infrastructure. SIP-trunk pricing varies: some services charge per channel or require commitments, while others are pay-as-you-go with no contract or reserved capacity. This is the structure used by call centres, trade businesses with overseas supply chains, and businesses with distributed international teams.

Softphone Apps for International Calling

A softphone is an app on a laptop, desktop, or mobile that acts as a VOIP phone using the device's microphone and speakers. For staff who travel internationally or work with overseas clients from laptops, a softphone app connected to your AU VOIP system means international calls cost the same as any other call on the plan -- the call travels over the internet to your provider and back out to the destination, regardless of where the staff member physically is.

The practical implication: a staff member in Melbourne calling a supplier in Singapore uses the same per-minute rate as if they were in the Melbourne office. A staff member travelling in Singapore can call a Melbourne colleague free when the call is made extension-to-extension within the same account; calling the office's public number may be billed as an external call. AU VOIP providers include softphone apps with most business plans -- confirm this is included before signing up if remote or travel use is a requirement.

Calling International Mobile Numbers

Providers may distinguish fixed and mobile destinations, but the price and bundle treatment vary: some mobile calls cost more, some cost the same, and some are included. Coverage of international mobile numbers depends on the destination and plan. For the USA, some Australian plans include both fixed and mobile numbers or charge the same rate for both., typically 5 to 20 cents per minute on VOIP versus 30 to 80 cents on standard AU business plans. If your business regularly calls international mobile numbers, check the mobile rate specifically, not just the headline international rate.

AU Caller ID on International Calls

When your staff call international numbers, the recipient sees your caller ID. A hosted VOIP provider can present a configured Australian geographic number as outbound caller ID, but caller ID cannot be guaranteed on international routes. Australian 13, 1300 and 1800 numbers cannot be used for CLI overstamping. This is important for businesses calling overseas clients or partners who need to recognise the calling number. Some VOIP providers allow you to set a specific outbound CLI per user or per call queue, which matters if you have multiple AU numbers across locations or departments.

Time Zone Considerations

Australian businesses working across Asia-Pacific, UK, and US time zones benefit from after-hours call routing on their VOIP system. When staff finish for the day, calls from international time zones can be routed to a voicemail with international callback instructions, or to an on-call extension. The VOIP system's schedule-based routing handles this automatically once configured -- no manual forwarding required. A pharmacy or medical practice taking calls from international patients has different compliance requirements here; see specific industry guides for those cases.

Checking Call Quality to International Destinations

Call quality on international VOIP calls depends on the provider's routing to that specific country. A provider with strong routing to USA and UK may have noticeably worse quality on calls to Indonesia or Vietnam -- their wholesale carrier for those routes may be lower quality. Before committing to a VOIP provider for international calling, ask about their routing for your specific destination countries. Some providers offer a test call to a specific destination number. Echo, delay and broken or choppy audio do not by themselves identify whether the fault is on the international route or the local connection; packet loss, jitter and latency can occur anywhere along the call path.

What to Check Before Switching

Before moving international call volume to a VOIP provider, confirm: which countries are covered by included minutes (if any), per-minute rates for your specific destination countries (both landline and mobile), whether softphone apps are included for staff who travel or work remotely, and what the data storage and privacy position is if call recording is enabled (relevant if calls include customer or patient information). AU businesses calling countries with strict data localisation laws should also confirm where call recordings are stored.

If international calls are a regular part of your business and you are evaluating which hosted VOIP system to move to, our comparison of the best phone system for small business in Australia includes notes on which AU providers include international bundles and which charge per-minute rates.

International calling is one of several variable cost components in a hosted VOIP plan. For a full breakdown of what AU VOIP plans actually cost when all per-minute, per-user, and feature add-on charges are included, see our guide to VOIP costs for Australian businesses.

If you are comparing whether a hosted VOIP system or a traditional landline is the better long-term option for your business, our guide to VOIP vs traditional phone systems in Australia covers the full cost, reliability, and feature comparison including how international call pricing differs between the two approaches.