Mitel in the Comms Cupboard? Telstra's Maintenance Safety Net Has Gone. Here Is the Way Out.
Telstra's PABX exit took effect on 30 September 2026 and named Mitel, including Aastra and ShoreTel, among the brands affected. Summit moves your business to a cloud phone system with new handsets, your numbers ported free, and a free assessment first so you know exactly what you have.
Free for businesses moving off an old phone system
Free site assessment and free local number porting
Offer: a free assessment of your current phone system, and free porting of local (geographic) numbers when you move to a Summit voice plan. 1300, 1800 and 13 numbers are excluded. $0 upfront hardware is included on our MAX plans. Available until 31 December 2027 unless extended. Terms apply.
Overview
If the front of the box says Mitel, MiVoice or Aastra, this page is for you. Mitel systems come under several names: MiVoice Office 250, MiVoice Business (the 3300), MiVoice 5000, MX-ONE, and older SX-200 and SX-2000 systems. A box like that tends to run quietly for years, which is exactly why nobody has looked at it lately.
We are not going to tell you your system is dead, because we do not know that. Here is what is actually on the record.
Telstra's PABX exit named Mitel. Telstra withdrew PABX hardware supply, TBS Care maintenance and Managed Voice Services, with an exit date of 30 September 2026. Its list of affected brands included Mitel (including Aastra and ShoreTel). That date has now passed. If Telstra looked after your Mitel system, that fault service has ended, and Telstra's own advice is to sign an agreement with a PABX maintenance provider.
For MiVoice Office 250, Mitel itself has announced an end-of-life process. Mitel's own page states it has announced the end-of-life process for MiVoice Office 250, and names MiVoice Business as the replacement. That page does not give dates, and the dates we have seen come from resellers, so we are not quoting any. Ask your maintainer for Mitel's notice and read the dates for yourself.
For MiVoice Business, MiVoice 5000 and MX-ONE, we have not found a vendor end-of-life notice. We are saying that plainly rather than inventing urgency. The better question is whether your system suits how your business works now.
ISDN has already gone. Telstra's final ISDN exit date was 31 May 2022 in nbn fixed-line areas and 30 November 2022 in satellite and wireless areas, with approved extensions to 31 May 2023. A Mitel system with ISDN cards now relies on a gateway or SIP trunking to reach the network.
None of this means your phones stop ringing tomorrow. It means the safety net under an ageing system is thinner than it was, and you can choose your moment instead of having it chosen for you. For a wider look at your options, see our guide to replacing your old phone system.
Summit Internet is an independent Australian carrier (ACMA Carrier Licence #388) that has served businesses since 2000. Mitel and MiVoice are trademarks of their respective owners, used here only to identify the product you have. Summit Internet is not affiliated with Mitel.
Key Benefits
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A Free Assessment Before You Spend a Cent
We start with what you actually have: the platform and release, users and handsets, which lines and numbers are connected, and everything plugged into the system, such as EFTPOS, alarms, fax, door intercoms and paging. You get an honest summary, including whether waiting a while longer makes sense.
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Free Local Number Porting
Your customers know your number, so we keep it. When you move to a Summit voice plan, we port the local (geographic) numbers on your service at no charge: your main line, direct numbers and fax numbers, such as 02, 03, 07 and 08 numbers. 1300, 1800 and 13 numbers are excluded from the offer, and can still be ported. Available until 31 December 2027. Terms apply.
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New Handsets, With $0 Upfront Hardware on MAX Plans
Your new desk phones, cordless handsets and reception console arrive preconfigured, with extensions, greetings and ring groups already set up. Plug them in. $0 upfront hardware is included on our MAX plans, so moving does not mean a big cheque for handsets.
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Everything Included in One Per-User Price
Hosted PBX from $10 per user per month. Auto attendant, ring groups, call queues, voicemail to email, time-of-day routing, call recording and mobile and desktop apps are all included. No feature packs, no licence codes, no paying again to add a user.
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Phones That Follow Your People
A cloud phone system does not care where staff are sitting. Make and take calls on your business number from the Summit app on a mobile or laptop, from the office, home or a client site. The ABS reports that 36% of employed Australians usually work from home, and a box in the comms cupboard cannot follow them there.
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One Less Specialist to Chase
An on-premise system means a controller in a cupboard, software releases to track, and an installer who knows your platform. With a cloud phone system, the platform is ours to run. Adding a user, changing a greeting or rerouting after-hours calls takes a few clicks in a web portal.
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A Cutover Day You Choose
We plan the move for a quiet day, test inbound and outbound calls with you, and check every connected device before we tell you to cancel anything. Leave it until the system fails and you take whatever day it picks.
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Internet and Backup Handled Properly
Cloud phones are only as good as the connection under them. We can supply business nbn with automatic 4G backup, with voice prioritised across our network, so one outage does not take your phones out with it.
What You Will Keep, and What You Will Miss Moving From Mitel
We would rather be straight with you. Here is how the day-to-day compares.
| On your Mitel system today | On Summit Hosted PBX |
|---|---|
| Auto attendant and hunt groups, programmed by an installer | Auto attendant, ring groups and queues you can edit yourself in a web portal |
| Voicemail on the system | Voicemail to email, included |
| Handsets your staff know by heart | New handsets, preconfigured, with a short adjustment while people learn the layout |
| A reception console wired to the system | A reception console or softphone view that shows who is on a call |
| Calls between desks keep working if the internet drops | Needs internet to work, so we pair it with automatic 4G failover, and staff can take calls on the mobile app |
| Changes made by a Mitel-skilled installer, or one person in the office | Changes made in the portal, or by our team |
The honest trade is simple: an on-premise system can keep internal calls working with the internet down, and a cloud phone system depends on a good connection. That is why we do not sell one without talking through your internet and backup first. You will also lose the familiarity of handsets you have used for years. New phones take a week or so to feel normal.
How It Works
- 1 Book your free assessment
Book your free assessment
Fill in the form above or call 1300 049 749. Tell us the platform and, if you know it, the model. A photo of the box, or of a handset, is enough.
- 2 We look at what you have
We look at what you have
A Summit specialist reviews your platform, users, lines and numbers, and everything connected to the system. We list every number you want to keep and every device that depends on the phones.
- 3 Choose your handsets, or go softphone only
Choose your handsets, or go softphone only
Pick desk phones, cordless handsets and a reception console, or go softphone only and take calls on the Summit app. Mix both if that suits your team. $0 upfront hardware is included on our MAX plans.
- 4 We preconfigure and ship
We preconfigure and ship
Your handsets arrive with your extensions, auto attendant and ring groups already set up. Nothing to program.
- 5 We port your numbers and cut over
We port your numbers and cut over
We port your local numbers on the day you choose, test inbound and outbound calls with you and check connected devices. Only then do we tell you what to cancel with your old provider. Port first and cancel after: a number that has been disconnected can no longer be ported.
Features
What Your Move Includes
- Free site assessment
- : A review of your current system, numbers and connected devices, before anything changes.
- Free local number porting
- : Local (geographic) numbers moved to Summit at no charge. 1300, 1800 and 13 numbers excluded from the offer. Available until 31 December 2027. Terms apply.
- New handsets
- : Desk phones, cordless DECT handsets, reception consoles and softphone apps, preconfigured before delivery.
- Cutover testing
- : Inbound, outbound, transfers, voicemail and attached devices tested on the day.
- One bill, one support number
- : Phones, and internet and backup if you want them, from one provider.
Phone System Features Included
- Auto attendant (IVR)
- : A professional greeting that routes callers to the right person or team.
- Ring groups and call queues
- : Ring several phones at once or in turn, and hold callers in a queue when it is busy.
- Voicemail to email
- : Messages delivered to your inbox as audio files.
- Time-based routing
- : Different call handling for business hours, after hours and public holidays.
- Mobile and desktop apps
- : Make and take calls on your business number from a mobile or laptop.
- Call recording and reporting
- : Record calls for training or compliance, and see call volumes and missed calls.
Hosted PBX or Microsoft Teams Calling After Mitel?
Most Mitel businesses land on one of two replacements. We will recommend the one that fits how your team actually works, including the simpler one if that is the right call.
Summit Hosted PBX
- Best for
- Offices, clinics, trades and shops that answer calls on desk or cordless phones.
- How it works
- A complete cloud phone system with handsets, auto attendant, ring groups and queues, managed from a web portal.
- Pricing
- From $10 per user per month, every feature included.
- Good to know
- The closest match to how a traditional Mitel system works day to day, with far less to look after.
Microsoft Teams Calling
- Best for
- Teams that already live in Microsoft 365 and Teams.
- How it works
- Summit connects Teams to the phone network, so staff call from the Teams app they already use.
- Pricing
- Requires Microsoft Teams Phone licences in addition to Summit calling.
- Good to know
- Most staff use a headset and the Teams app; desk phones are optional.
Not ready to replace everything at once? Some IP-capable Mitel systems can connect to Summit SIP trunks, which moves your lines and numbers first. Whether yours can depends on the model and release, so we check before suggesting it, and we will tell you if it is only a stopgap. If your business also ran ShoreTel at another site, Mitel acquired ShoreTel in 2017, and we have a page on replacing a ShoreTel phone system.
Use Cases
These are scenarios to show how a move can look, not customer stories.
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The Medical Practice With a Reception That Cannot Miss a Call
Dentists & GPsA suburban clinic has several lines, a fax number for referrals and a front desk that handles every appointment call. We port the numbers, set up a queue for reception with overflow to the practice manager, and turn the fax number into fax to email, so referrals arrive in the inbox.
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The Law Firm With a Reception Console and Direct Dials
Lawyers & AccountantsA firm has a receptionist who transfers calls to partners and every lawyer has a direct number clients use. We port every direct number, build the reception view around who is in, on a call or away, and let partners take their direct line on a mobile when they are in court or at a client.
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The Manufacturer With Cordless Handsets on the Floor
ManufacturingA small manufacturer runs cordless handsets between the office and the workshop. We map where the handsets are used during the assessment, plan cordless coverage for the whole site, and agree a working path for paging and the gate intercom before cutover.
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The Business Whose Telstra-Maintained System Needs a New Home
A company has a Mitel system that Telstra maintained for years, and nobody has a replacement contract. Rather than hunt for a new maintainer for an ageing box, we assess whether to move the lines first or the whole system, and give you a straight answer on which makes sense.
Your situation not on this list? Tell us what you run or call 1300 049 749 and we will tell you honestly whether we can help.
Still running Mitel phone systems?
Book a free assessment. We will look at what you have, tell you honestly what it will cost to keep, and show you what moving looks like, with your numbers ported free.
Why Choose Summit to Replace Mitel
- 01
We Are a Carrier, Not Just a Reseller
Summit holds its own ACMA Carrier Licence (#388) and has served Australian businesses since 2000. Your phone service, number porting and internet come from the company that runs them.
- 02
One Team for the Whole Move
Phones, numbers, internet and backup are planned together by one team, so you do not have to coordinate an installer, a carrier and an internet provider.
- 03
Straight Answers, Including "Not Yet"
If your system is healthy and the right move is to wait, or to start by moving your lines, we will say so. A free assessment is not a sales trap.
- 04
Your Numbers Stay Yours
Local numbers ported free, tested before you cancel anything, with port first and cancel after as our standard order.
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Bundle them on one bill →Why Australian Businesses Choose Summit Internet
Great business and service provider. Highly recommended.
Nabil Salameh
last month
The Summit Team have always been a pleasure to work with; we highly recommend their services. Thank you for the continued support.
Paul Braithwaite
5 months ago
We recently moved our dental practice over to Summit for phone services, and the experience has been excellent from start to finish. The team has been responsive, professional, and incredibly helpful throughout the entire setup process. The transition was smooth, any issues were addressed promptly, and communication was always clear and efficient. Reliable phones and internet are essential for a busy practice like ours, and Summit has delivered exactly that. A special thank you to Michael for his patience and ongoing assistance during the transition. Highly recommend Summit to any business looking for reliable service and great customer support.Read more
Elli Darabi
5 months ago
The best service !!! Got issue fixed out by Greg ^^
白大倫
5 months ago
The whole team at Summit have been great from the initial onboarding to the rapid responses from Max when we need to make changes or additions to our services. Can't recommend them enough!
Aaron Klaver
5 months ago
As the I.T. Manager for Hydronic Systems Australia, Summit helps provide me and our companies with consistently stable Business Grade Internet, backed up by a dedicated Fixed Wireless Broadband connection. They also saved us a serious amount of money on our mobile phone bills. We have had no serious issues, and our business has been rock-solid under there great service. Highly Recommended.Read more
James Paterson
6 months ago
Prompt and efficient service. Highly recommend
Elliot Bell
6 months ago
We now use Summit across our real estate network. Great family business, reliable and their attention to detail is outstanding. Highly recommend.
Ryan Bell
6 months ago
As a reseller, we primarily work with Summit’s 4G services and have been very impressed. The plans are affordable, flexible, and well suited to our customers—especially for internet failover solutions. The sales and support teams are responsive and genuinely helpful, which is why we’re proud to partner with Summit Internet. We happily recommend them.Read more
Mal Skinner
6 months ago
After working with another ISP for several months to deliver a critical internet service for a major international sporting event, we were ultimately advised that the required upgrade was unlikely to be completed prior to event week. This left us facing a significant risk to service delivery. After exhausting all other options (and a few sleepless nights) we came across Summit Internet. From the initial conversation, Allan immediately understood the severity of the situation and quickly engaged his technical delivery team. Michael “Radar” was on site within days to assess and finalise a solution. Despite challenging conditions, including large trees and other obstructions, he worked tirelessly to design and implement an alternative approach. Leveraging an adjacent building, a temporary NBN connection, and a wireless link into the comms room, the solution was delivered within 24 hours of the initial site visit. Not only was the outcome faster than expected, but it was also more cost effective and delivered higher speeds than originally promised by the previous ISP. Over the course of the event, the service handled terabytes of data and supported hundreds of concurrent users without a single speed or performance issue. I cannot thank Summit Internet, particularly Allan and Radar enough for their exceptional service, technical expertise, and commitment to delivering under pressure. Highly recommended.Read more
Adam Hastie
6 months ago
Fausto and the staff at Summit are amazing. We have had nothing but fantastic service from start up to problem solving issues. The system is easy to use. Would highly recommend this service provider.
Jo Bodhankar
6 months ago
Summit internet recently set my small business up with a local land line number and a soft phone that runs off an app on my mobile - getting my personal phone number off the internet and being able to distinguish between business and personal calls is a game changer. Whole process took less than a week, and is super cost effective. Highly recommend.Read more
Alex Holly
8 months ago
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Frequently asked questions
Has Mitel discontinued the MiVoice range?
Is my Mitel system end of life?
Do I have to replace everything at once?
Will I keep my phone numbers?
Can I keep my Mitel handsets?
What about EFTPOS, alarms, fax and door intercoms?
What does a cloud phone system cost?
What happens if the internet goes down?
Find Out What Your Mitel System Is Really Costing You to Keep.
Talk to someone who can actually action it, not read you a list of plans. Tell us how your business runs and we will tell you what suits it.
Call 1300 049 749 · Mon-Fri 9AM-5PM AEST