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Summit Internet
Telstra Business SIP customers

Telstra Business SIP Is Closed to New Customers. Plan Your Next SIP Trunk on Your Terms.

Telstra stopped selling Business SIP on 30 May 2025. Keep the phone system you have, move your SIP trunks to Summit's own voice network, and have the local numbers on your Telstra service ported free. Our dedicated migration team plans the move around your contract date.

Claim Free Number Porting Call 1300 049 749

One-time offer for Telstra customers

Free local number porting when you move your Telstra Business SIP service

Step 1 of 2: your details
Which Telstra SIP service do you have? *

Offer: free porting of local (geographic) numbers attached to your Telstra service when you move to a Summit voice plan. 1300, 1800 and 13 numbers excluded. Expires 30 August 2027 unless extended.

Would rather talk? Call 1300 049 749

Overview

Telstra Business SIP connects a business phone system to the phone network over broadband: voice lines over a SIP trunk, single numbers or 100-number in-dial ranges, and a Telstra SIP network termination unit on site. Telstra's customer terms state that "On and from 30 May 2025, Telstra Business SIP is not available for purchase by any new customers. Existing customers may continue to use their Business SIP service on existing terms until further notice."

Telstra Business SIP Status
New customers Not available from 30 May 2025
Existing customers Continue on existing terms "until further notice"
Announced exit date None published

To be clear about what that means: your Business SIP service has not been given a switch-off date, and Telstra's terms still allow existing customers to add voice lines and extend their term. Nothing forces you to move today.

What it does mean is that you are on a product Telstra no longer sells, with continuity described only as "until further notice". Telstra has set exit dates for several other business voice products, including T-Biz Voice, DOT and Telstra Calling for Office 365, as well as Wholesale CTS. The best time to choose your next SIP provider is before you need to, ideally lined up with your contract end date, a phone system upgrade or an office move.

Summit SIP trunks connect the phone system you already own to our own voice network (ACMA Carrier Licence #388). Summit Internet is an independent carrier and is not affiliated with Telstra.

Key Benefits

  • Keep the Phone System You Already Own

    SIP trunks replace the carrier, not the phone system. Your PBX, handsets, extensions and call flows stay exactly as they are; only the trunk behind them changes.

  • Free Local Number Porting

    Move your Business SIP service to Summit and we port the local numbers attached to your Telstra service with no porting fee, including your in-dial ranges. A one-time offer for Telstra customers, available until 30 August 2027 unless extended.

  • Calls on a Network We Own

    Your trunks connect to infrastructure Summit builds, owns and operates. When call quality needs investigating, we look at our own network instead of raising a ticket with a wholesaler.

  • Voice Priority When We Supply the Internet Too

    Business SIP needs a broadband service you buy separately. Put your SIP trunks on a Summit internet connection and we prioritise voice traffic across our network, so calls stay clear when the office is busy.

  • Scale Lines Up and Down

    Start with as few as two channels and add more as you grow. Changing capacity is a configuration change, not a new install.

  • Move on Your Contract Date

    Telstra's terms set an early termination charge if you cancel during a contract term. Our migration team works out your timing so the cutover lands at the end of your term, not in the middle of it.

  • Or Retire the PBX Altogether

    If your phone system is due for replacement anyway, move straight to Summit hosted PBX or Microsoft Teams Calling and your numbers come across under the same offer.

How It Works

  1. 1 Submit your enquiry

    Fill in the form above or call 1300 049 749. Tell us how many voice lines you run, which numbers you want to keep and what phone system you have.

  2. 2 Our dedicated migration team calls you

    A specialist reviews your phone system, number ranges, concurrent call needs and your Telstra contract end date, and recommends the right channel count.

  3. 3 Choose your path

    Keep your PBX on Summit SIP trunks, or move to Summit hosted PBX or Microsoft Teams Calling. If you change phone systems, choose physical handsets or go softphone only.

  4. 4 We configure and test

    We set up your SIP trunk, configure your number presentation and test with your phone system before any numbers move. New handsets, if you need them, arrive preconfigured.

  5. 5 Port on the day you choose, with migration support

    Your local numbers and in-dial ranges port to Summit on a scheduled cutover day. We test inbound and outbound calls with you, then tell you what to cancel with Telstra and when. Do not cancel first: a disconnected number can no longer be ported.

Features

Summit SIP Trunks

Flexible channel counts
: Start with as few as two channels and scale up as your business grows.
Single numbers and ranges
: Individual numbers and 100-number in-dial ranges.
Free local number porting
: Local numbers on your Telstra service ported with no porting fee.
Own voice network
: Trunks terminate on infrastructure Summit operates.
Voice prioritisation
: Quality of Service when your internet is also with Summit.

What Your Migration Team Handles

Contract timing
: A cutover planned around your Telstra term to avoid unnecessary early termination charges.
PBX configuration
: Trunk settings tested with your phone system before cutover.
Number range porting
: In-dial ranges and single numbers ported in a planned sequence.
Cutover testing
: Inbound, outbound, transfers and direct dials tested on the day.
Telstra exit guidance
: What to cancel, when, including any Telstra equipment on site.
Talk to an expert

Line the move up with your contract end date

Telstra Business SIP is closed to new customers. Plan your next SIP trunk now and our migration team will time the cutover to avoid early termination charges, with your local numbers ported free.

Claim free number porting Call 1300 049 749

Keep Your PBX or Replace It?

Most Business SIP customers keep their phone system and swap the trunk. But if the PBX is near the end of its life, it may be simpler to replace both at once.

Keep Your PBX on Summit SIP Trunks

Best for
Businesses with a phone system that still does the job and has years left in it.
How it works
Summit SIP trunks replace Telstra Business SIP behind your existing PBX.
Disruption
Minimal. Staff keep the same handsets and extensions.
Good to know
Pairs naturally with a Summit internet connection for voice priority.

Replace It With Summit Hosted PBX

Best for
Businesses with an ageing phone system or a support contract about to renew.
How it works
A cloud phone system with handsets, apps, auto attendant and queues.
Pricing
From $15 per user per month, every feature included.
Good to know
No PBX hardware to maintain, and your numbers port across under the same offer.
See Replace It With Summit Hosted PBX

Your migration specialist will tell you honestly which suits you.

Call 1300 049 749

Why Choose Summit

  • 01

    A Licensed Carrier With Its Own Network

    Summit holds ACMA Carrier Licence #388 and runs its own voice network. Your SIP trunks are not resold from someone else's.

  • 02

    One Provider for Internet and Voice

    When your internet and SIP trunks are both on Summit, one team owns the whole voice path and there is no finger-pointing between providers.

  • 03

    Business Only

    Summit does not sell residential services. Our support and priorities are built around businesses whose phones are their front door.

  • 04

    Moving Businesses Off Retiring Services Since 2000

    ISDN and PSTN shutdowns, the nbn rollout and providers leaving the market: we have helped businesses through all of it.

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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

Reviews from Google. Read all reviews on Google

Frequently asked questions

Is Telstra Business SIP being shut down?
Telstra has not published an exit date. Its customer terms state that from 30 May 2025 Business SIP is not available to new customers, and that existing customers may continue to use the service on existing terms until further notice.
Can I still add lines to my Telstra Business SIP service?
Telstra's terms say existing customers can increase their minimum contract term or number of voice lines at any time without penalty. Changes may attract an adds, moves and changes fee, and Telstra says some restrictions may apply.
Why move if my service still works?
Because you are on a product that is closed to new customers, with continuity described as "until further notice". Planning the move around your contract end date, an office move or a phone system upgrade lets you change on your schedule rather than someone else's.
Will Summit SIP trunks work with my phone system?
Summit SIP trunks work with most modern IP phone systems. Your migration specialist will confirm compatibility with your PBX and test the trunk with it before any numbers move.
Can I keep my numbers and in-dial ranges?
Yes. Local numbers and 100-number in-dial ranges can be ported to Summit. Under this offer, we port the local numbers attached to your Telstra service free of charge.
What does the free number porting offer include?
Free porting of the local numbers (geographic numbers such as 02, 03, 07 and 08 numbers) attached to your Telstra service when you move to a Summit voice plan. It is a one-time offer for Telstra customers and expires on 30 August 2027 unless extended. 1300, 1800 and 13 numbers are not included.
Will I pay Telstra to leave early?
Possibly, if you are within a contract term. Telstra's terms set an early termination charge of 30% of the remaining monthly service charges for the remaining months, plus any outstanding equipment amount, and also apply it if you cancel more than 30% of your voice lines. Check your contract end date with Telstra; we will plan your cutover around it.
Should I cancel Telstra before switching?
No. Only active numbers can be ported. Keep the Telstra service running until your numbers have moved to Summit, then cancel.
Is Summit part of Telstra?
No. Summit Internet is an independent Australian carrier (ACMA Carrier Licence #388) and is not affiliated with Telstra.
Get started

Choose your next SIP trunk before you have to.

Tell us about your phone system and contract date, and our migration team will plan a move that keeps your PBX and your numbers.

Call 1300 049 749 · Mon-Fri 9AM-5PM AEST

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