Quick Answer: Porting Timelines at a Glance
If you need a number before a specific date, work backwards from that date using these ranges:| Category A (simple port) - geographic numbers, VOIP to VOIP | Category C (complex port) - cross-technology, ISDN, number blocks | 1300 or 1800 number transfer | Mobile number port | |
|---|---|---|---|---|
| Realistic Range | 1 to 5 business days | 5 to 15 business days | 5 to 20 business days | 1 to 3 business days |
| Best Case | Next business day | 5 business days | 5 business days | Same business day |
| With One Rejection | Add 3 to 7 days | Add 5 to 10 days | Add 5 to 14 days | Add 2 to 5 days |
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Your provider says 1 to 2 days. Reality is 1 to 5 business days for a simple port, and 5 to 15-plus for a complex one. The gap is not incompetence. It is that every port depends on the losing carrier's cooperation and the accuracy of your account paperwork. Build in buffer time, especially for business-critical numbers.
Cat A vs Cat C: Which One Applies to Your Number?
Every Australian number port falls into one of two categories. Which one applies to you determines both the timeline and the complexity of the process. The category is assigned based on the number type and the technology change involved, not on what you prefer. For a comparison of current options, see our guide to the best phone systems for small business in Australia.Category A: Simple Port
Category A covers the majority of business VOIP ports. If you have a single geographic number (02, 03, 07, or 08 prefix) or a mobile number, and you are moving it between providers that use the same underlying network technology, you are almost certainly in Cat A. This is the standard scenario: a small business moving their existing office number from Telstra or a budget ISP to a proper business phone company like Maxotel.Cat A ports use the Local Number Portability (LNP) system. The gaining carrier submits the porting authority to the losing carrier, the records are validated against billing data, and the cutover is scheduled. On cutover day, the number flips from the old system to the new one. The technical cutover itself takes minutes. The wait time is the validation and scheduling process in between.Realistic timeline for Cat A: most ports go through in 2 to 3 business days. The 1 to 5 day range accounts for losing carriers that are slower to respond, account detail validation issues that need minor corrections, and cutover scheduling preferences (you typically nominate a preferred time window).Category C: Complex Port
Category C applies when the port crosses a technology boundary, involves multiple numbers, or includes service types that require additional coordination. Common Cat C scenarios for Australian businesses include:Moving from a legacy ISDN or analogue PSTN service to VOIP is Category C, because you are crossing from one network technology to another. If the PSTN copper shutdown has recently affected your premises, you may already be in this situation. Multi-number porting, where you want to move a bank of geographic numbers together, is also Cat C. Any scenario where more than one carrier is involved in delivering the current service adds coordination complexity.Cat C timelines are longer because they require more handoffs between carriers and sometimes involve manual coordination that cannot be handled by automated LNP systems. If you are in a Cat C scenario, ask your new provider to confirm the timeline in writing before you commit to a go-live date. Quoting a five-day turnaround to your team and then finding out it is a Cat C port is how avoidable stress gets created.
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Not sure which category your port falls into? Your new provider can check the LNP database and tell you before you submit anything. This should be one of the first questions you ask when onboarding. A good provider will check proactively. If they do not, ask directly: 'Is this a Category A or Category C port, and what is the realistic timeline?'
1300 and 1800 Number Timelines: A Different Process
Porting a 1300 or 1800 number does not use the standard LNP system. These are non-geographic numbers registered in the ACMA's Smart Numbers database, and they operate on a carrier assignment model rather than a network porting model. You own the number registration. Your provider is the carrier delivering calls to it. Changing providers means transferring the carrier assignment, not porting in the traditional sense.The practical effect is that the timeline is longer and the process involves more paperwork. You will need to provide your Smart Numbers account credentials or ROU (Right of Use) transfer documentation. Some providers manage this entirely on your behalf; others hand you the forms and expect you to coordinate. Clarify this upfront.Typical 1300/1800 transfer timeline is 5 to 15 business days for a straightforward transfer, with the upper end of 20 business days if documentation needs to go back and forth. If your business relies heavily on an inbound 1300 number for marketing or customer calls, plan for three to four weeks from decision to go-live. For more background on 1300 numbers in Australia, see our 1300 number guide.What Happens on Cutover Day
The actual cutover is the moment your number flips from the old system to the new one. For a Cat A port, this typically takes 15 to 60 minutes. For a Cat C port, the window is wider: allow 1 to 4 hours.During the cutover window, calls to your number may not connect reliably. Some will route to the old system (which may already be decommissioned), some will route to the new system, and some may receive a 'number not available' message. This is normal and temporary. It is not a sign that something has gone wrong. It is the propagation delay as the change ripples through the telephone network.To manage the cutover window practically: schedule it during your lowest call volume period (typically early morning or late afternoon on a Friday). Set up a brief forwarding arrangement to your mobile before the cutover starts. Brief your team that calls may be unreliable for up to two hours. Once the port is confirmed complete by your new provider, test an inbound call immediately. If it lands cleanly on your new system, you are done.After the cutover window, everything returns to normal. Your number works exactly as it did before, except now it is on your new VOIP system with all the call routing, IVR, and features you have configured. For the full setup process before your port, see our NBN VOIP setup guide.What Speeds Up the Porting Process
Porting timelines are not entirely in your control, but several factors consistently produce faster results.Clean Account Details
The single most effective action you can take is to confirm your exact account details with your current provider before submitting the porting authority form. The porting system validates the information you submit against the losing carrier's billing records. If the account holder name, service address, or account number has a single character discrepancy, the port is rejected. Call your current provider and ask them to read out exactly what appears on the account. Write it down. Submit that, verbatim.No Outstanding Balance
Some losing carriers will delay or obstruct a port if there is an unpaid balance on the account. This is not always a formal rejection, but it adds friction and back-and-forth. Clear any outstanding balance before initiating the port. If you are in a contract with an early termination fee (ETF), that is a separate financial matter that does not block the port, but be aware it will be charged.Correct Service Identifier (SPIN or Account Number)
Australian porting forms often require a Service Provider Identification Number (SPIN) or specific account reference. This is different from your billing account number in some cases. Your new provider will tell you which identifier they need. If you do not have it, it is on your current provider's invoice or available by calling their customer service line. Getting this right on the first submission is worth 5 minutes of effort to avoid a 3 to 7 day rejection recovery cycle.Responsive Losing Carrier
Not all of the timeline is in your hands. Losing carriers vary in how quickly they process porting requests. Major carriers (Telstra, Optus, TPG group) generally process within the regulatory timeframes. Smaller carriers and resellers are more variable. If your current provider is slow to respond to porting requests, your new provider should be chasing them. If they are not, that tells you something about how they handle problems.What Delays the Porting Process
Delays fall into two buckets: things you caused, and things outside your control. Both are common.Delays You Can Control
Wrong account holder name. This is the most common rejection reason. The name on the porting form must match the account holder name exactly as it appears in the losing carrier's system. If the account is registered under a business name that has since changed, or under a former employee's name, the port will be rejected. Fix: verify the exact name on the account before submitting.Incorrect SPIN or service identifier. Each number on a business account has a service-level identifier separate from the billing account number. Submitting the wrong one triggers an immediate rejection. Fix: ask your current provider to confirm the service identifier for the specific number you are porting.Number not associated with the account. Some businesses have numbers on their service that they are not aware are on a different account or sub-account. This happens when a business has grown, changed providers, or restructured over time. Fix: ask your current provider to confirm that the specific number you want to port is on the account you are providing details for.Cancelling the old service before the port completes. If you cancel your current service before the port is confirmed, the number is released from your account and cannot be ported. It disappears into the number pool. Port first, confirm completion, then cancel. Always.Delays Outside Your Control
Losing carrier processing times. Carriers are required under ACMA rules to process valid porting requests within prescribed timeframes, but 'within the timeframe' still gives them a window. A Cat A port can take up to 2 business days for the losing carrier to acknowledge and process. Some carriers use the full window as a matter of course.Public holidays. The porting system runs on business days. Public holidays in the state where the losing carrier's operations are based extend the timeline. A port submitted the day before a long weekend will not progress until after the break.Cutover scheduling windows. Most carriers offer cutover windows during business hours on business days. If your preferred cutover time is a specific morning slot and that slot is already taken, you may wait an extra day. Flexible businesses move faster.Legacy infrastructure. Numbers that are still on copper-based PSTN services or ISDN equipment require the losing carrier to physically decommission the service as part of the port. This adds real coordination time, particularly for services in rural or regional areas where the exchange infrastructure is older.What Happens When a Port Is Rejected
Rejections are common. They are not a disaster. A first-attempt rejection does not mean the port has failed. It means the paperwork did not pass validation and needs to be resubmitted with corrections.When a port is rejected, your new provider should receive a rejection notice from the losing carrier that includes a reason code. Common reason codes include: account holder name mismatch, service identifier incorrect, number not found on account, account has outstanding balance, or service is under a cooling-off period.A good provider will communicate the rejection reason to you clearly, tell you exactly what needs to be corrected, and resubmit once you have confirmed the correction. The resubmission process effectively restarts the timeline from zero. Plan for an additional 3 to 7 business days per rejection cycle for a Cat A port, or 5 to 10 business days for a Cat C port.If you receive a rejection, the first question to ask your provider is: 'What is the exact rejection reason code, and what information do I need to correct?' If they cannot answer that clearly, escalate within the provider. Vague answers like 'the other carrier rejected it' without a specific reason code mean someone has not done the diagnosis.
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One rejection adds 3 to 7 days to a simple port. Two rejections can take a simple port past 2 weeks. The most reliable way to avoid multiple rejections is to spend 10 minutes on the phone with your current provider before you submit anything, confirming the exact account holder name, service address, and account number. That call is worth a week.
Your Rights Under ACMA Rules: What to Do If a Provider Stalls
Number porting in Australia is regulated under the ACMA's Telecommunications Numbering Plan. Under this framework, losing carriers are legally required to support valid porting requests and process them within prescribed timeframes. A provider cannot refuse to release a number because they do not want to lose your business.If you have submitted a valid porting request with correct documentation and your current provider is not processing it within the regulated timeframe, you have escalation options. The first step is a formal complaint to the losing carrier's complaints team (not standard customer service). Most carriers have a dedicated complaints process and are required to respond within a defined timeframe.If the formal complaint does not resolve the issue, the next step is the Telecommunications Industry Ombudsman (TIO). A TIO complaint reference does two things: it creates a formal record of the dispute, and it triggers the carrier's internal complaints escalation process. In practice, most porting obstruction issues resolve within days of a TIO complaint being lodged. The TIO service is free for consumers and small businesses. You can lodge a complaint at tio.com.au.For context on broader VOIP switching decisions, see our VOIP vs traditional phone comparison.Planning Your Port: Work Backwards From Your Go-Live Date
The most common porting planning mistake is treating it as a finish line rather than a milestone. Businesses pick a date to be 'done with the old system' and then find out the port has not completed yet. The correct approach is to work backwards.Start with your target go-live date. The date you want your new VOIP system handling calls. Then work backwards: your new system needs to be fully configured and tested before the port completes, so allow 1 to 2 weeks for setup and testing on a temporary number. Add the port timeline on top: 5 business days for a simple Cat A port, 15 business days for a complex port or 1300 number. Add a buffer for one potential rejection: 7 business days. That gives you your submission deadline.Example: You want to be fully live on a new VOIP system by Wednesday 18 June. Working backwards: buffer for rejection (7 days) puts you back to Monday 9 June. Cat A port timeline (5 days) puts you back to Tuesday 3 June. System setup and testing (10 days) puts you back to Sunday 25 May. You need to start the process by 25 May to give yourself a realistic chance of a clean 18 June go-live.Most businesses that experience porting stress submit the port request the week before they want to go live. That works sometimes, for a first-attempt clean Cat A port with zero complications. It creates real problems when it does not. Give yourself 4 weeks from decision to go-live for a simple port. Give yourself 6 weeks for a complex port or 1300 number. For background on what migrating looks like end to end, see our landline to VOIP migration guide.Australian Businesses: Number Porting Reality Check
There is a specific anxiety around number porting that shows up repeatedly in AU business communications decisions. The anxiety is: 'What if I lose my number?' or 'What if it does not work?' These fears are legitimate but they are overestimated relative to the actual risk.The porting process is routine. Australian business phone companies process hundreds of ports every week. The technical infrastructure for porting has been in place for decades. Numbers do not disappear into a void. The worst realistic outcome for a straightforward number port is a delay, not a permanent loss. In the rare scenario where something goes genuinely wrong, the ACMA regulatory framework and the TIO exist to resolve it.The delay is paperwork, not technical difficulty. When a port takes 10 business days instead of 2, it is almost always because a detail needed correction, a carrier took the full regulatory window, or there was a public holiday in the chain. None of these are signs that your number is at risk.What actually causes number loss is not the porting process itself. It is businesses that cancel their current service before confirming the port is complete. Do not do that. Port first. Confirm completion. Then cancel.The NBN PSTN copper shutdown (completed 2025) has put many Australian businesses into a forced porting situation. If you were on a traditional landline connected to copper, that service no longer exists. Your only option now is VOIP, and porting your number to a proper business phone company is how you retain the number you have been using for years. The process is well-established for this scenario, and any competent business phone company has done it hundreds of times. For a broader comparison of your options now, see our VOIP vs traditional phone guide.What Most Businesses Get Wrong About Number Porting Timelines
Mistake 1: Treating the Provider's Quoted Timeline as a Deadline
When a provider says '1 to 2 days', that is their best-case scenario for a clean first-attempt Cat A port. It is not a commitment. If the account details need any correction, or if the losing carrier uses the full regulatory processing window, the actual timeline stretches. Treat quoted timelines as optimistic targets. Plan around the realistic range in the table above.Mistake 2: Submitting the Port Before the New System Is Ready
The port timeline and the system setup timeline run in parallel in some businesses' heads. They should not. Your new VOIP system should be fully configured, tested, and running on a temporary number before you submit the porting authority. When the port completes, the number lands on an already-working system. If you submit the port and then start configuring the system, you risk the port completing before the system is ready. That means calls to your number hit an unconfigured system. Not a good look.Mistake 3: Not Telling the Team What to Expect During the Cutover
The cutover window is real. For 15 to 60 minutes, calls to your number may not connect reliably. If your team does not know this is coming, they panic. If they do not have a temporary mobile number to give clients who call during the window, the business looks unreliable. Brief your team before the cutover date. Give them a mobile number to use as a backup during the window. It turns a potentially stressful event into a routine handover.Your Next Steps: Port Planning Checklist
Work through this checklist before you initiate any porting request:[ ] Confirm your port category with your new provider: Cat A or Cat C? Get the realistic timeline for your specific scenario in writing. [ ] Set your go-live date and work backwards: new system fully live by [date] = port submitted by [date - 3 weeks minimum for simple, 6 weeks for complex]. [ ] Call your current provider and confirm exact account holder name, service address, and account number (not just your billing email). [ ] Check for outstanding balance on your current account. Clear it before submitting. [ ] If porting a 1300 or 1800 number: confirm with your new provider that they support 1300/1800 hosting and understand the Smart Numbers transfer process. [ ] Set up your new VOIP system on a temporary number. Configure IVR, call routing, voicemail, ring groups. Test everything. [ ] Submit the porting authority form with verified account details. [ ] Choose a cutover date and time during your lowest call volume period. [ ] Set up mobile call forwarding from your current number for the cutover window. [ ] Brief your team on the cutover date, time, and backup contact number. [ ] On cutover day: wait for provider confirmation, then test inbound and outbound calls immediately. [ ] After port confirmation: cancel old service (not before).If you want a recommendation on which provider handles number porting smoothly for Australian businesses your size, our team can point you in the right direction. See the Get a Recommendation page.The expected porting timeline depends almost entirely on number type and category. Our Number Porting Checker identifies your number's type and category upfront, so you know whether to plan for a 2-business-day Cat A port or a 10-business-day Cat C process before you start.
What Does Number Porting Cost?
Number porting in Australia is usually free or close to it. Most cloud phone providers charge $0 to port a number in. Some charge a one-off administration fee of $25-50. The losing provider (the telco you are leaving) may charge a service cancellation or early termination fee if you are mid-contract. CAT-A ports (standard SMB numbers) typically have no porting fee on either side. CAT-C ports (complex multi-line or ISDN services) may incur fees of $50-200 depending on complexity. The ongoing cloud phone plan after porting costs $20-35 per user per month (inc. GST).
How long does number porting take in Australia?
Category A ports (simple geographic or mobile numbers) typically take 1 to 5 business days, with most completing in 2 to 3. Category C ports (cross-technology, multi-number, ISDN) take 5 to 15 business days. 1300 and 1800 number transfers take 5 to 20 business days. Each rejection adds 3 to 7 business days for a Cat A port and 5 to 10 business days for a Cat C port. For planning purposes, allow 4 weeks from decision to go-live for a simple port and 6 weeks for a complex one.
What is the difference between Category A and Category C porting?
Category A covers simple ports where a geographic or mobile number moves between providers using the same underlying network technology. Most business VOIP ports are Cat A. Category C covers ports that cross a technology boundary (for example, moving from an ISDN or legacy PSTN service to VOIP), involve multiple numbers being ported together, or require coordination between more than one carrier. Cat C takes longer because of the additional coordination involved. Your new provider can confirm which category applies to your number before you commit to a timeline.
How long does it take to port a 1300 number in Australia?
1300 and 1800 number transfers typically take 5 to 20 business days. These numbers use a different process from standard geographic number porting. Instead of the LNP porting system, you are transferring the carrier assignment in the ACMA's Smart Numbers database. This requires Right of Use (ROU) documentation and coordination between the outgoing and incoming carrier. Plan for 3 to 4 weeks from decision to go-live for a 1300 or 1800 number transfer, and confirm with your new provider that they support 1300/1800 hosting before starting.
Why was my number port rejected, and how do I fix it?
The most common rejection reasons are: account holder name does not match exactly, incorrect SPIN or service identifier, number is not found on the account, or the account has an outstanding balance. Your new provider should receive a rejection reason code from the losing carrier. Ask them for the specific code and what information needs to be corrected. Once you have confirmed the correct details with your current provider and updated the porting authority form, the port can be resubmitted. Allow an additional 3 to 7 business days for a Cat A port after resubmission.
Will my number be lost during the porting process?
No. The number does not disappear during the port. There is a cutover window, typically 15 to 60 minutes, during which calls may not connect reliably. Outside that window, your number is active on either the old or the new system. The risk is not permanent number loss. It is a brief period of reduced reachability during the cutover window. That risk is manageable by scheduling the cutover during low-volume hours and forwarding to a mobile during the window. The one scenario that actually causes number loss is cancelling your current service before the port completes. Never do this.
Can my current provider block or delay my number port?
Providers cannot refuse a valid porting request. Under the ACMA's Telecommunications Numbering Plan, losing carriers are legally required to process valid ports within prescribed timeframes. A provider can reject a port for legitimate technical reasons such as account detail mismatches, but they cannot simply refuse because they want to retain your business. If your provider is obstructing a valid port, lodge a formal complaint with their complaints team first. If that does not resolve it, lodge a complaint with the Telecommunications Industry Ombudsman (TIO) at tio.com.au. Most obstruction issues resolve quickly once a TIO reference number is in play.
What happens during the cutover window on porting day?
The cutover window is the period when your number transitions from the old system to the new one. It typically lasts 15 to 60 minutes for a Cat A port and 1 to 4 hours for a Cat C port. During this window, calls to your number may not connect reliably. Some calls may reach the old system (which may already be decommissioned), some may reach the new system, and some may receive a 'number not available' message. This is normal. It is not a sign the port has failed. Schedule the cutover during your lowest call volume period, forward your number to a mobile before the window starts, and test inbound calls as soon as your provider confirms completion.
How far in advance should I submit my port request?
At minimum, submit 2 weeks before your target go-live date for a simple Cat A port. For a complex Cat C port or a 1300 number transfer, submit 4 to 6 weeks in advance. These windows include a buffer for one rejection cycle and cutover scheduling. Before you submit, your new VOIP system should already be configured and tested on a temporary number. Businesses that submit the week before they need to go live are taking a risk that a clean first-attempt port will work without any delays. Most do, but the ones that do not create significant stress. Build in buffer.
Does number porting cost anything?
For most Australian business VOIP ports, porting fees are $0 to $30 AUD from the gaining carrier. Many providers include porting as part of their onboarding process at no charge. The more significant cost to watch for is any early termination fee from your current provider if you are within a minimum contract period. Check your contract terms before initiating the port. For 1300 and 1800 number transfers, some providers charge a small administration fee of $20 to $50 AUD.
Can I port my number if I am switching from NBN to a different connection type?
Yes. Number portability is independent of your physical internet connection. You can port a geographic number to a business phone company regardless of whether you are on NBN FTTP, FTTC, FTTN, or a business fibre connection. The port is a carrier-level transaction. Your internet connection is what the VOIP service runs over after the port. If you are switching both your internet provider and your phone provider at the same time, coordinate the timelines so your internet connection is live before the phone port completes. A VOIP service with no internet connection is not useful.
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