Plan Your Transition Before Telstra Calling for Office 365 Ends
Telstra Calling for Office 365 (TCO365) is being withdrawn, which means businesses currently using the service need to plan how their Microsoft Teams calling environment will operate moving forward. While the change affects the calling connectivity provided through Telstra, it does not mean Microsoft Teams itself is being discontinued. The good news is that businesses can continue using Microsoft Teams while migrating to another compatible calling solution. Planning ahead gives you time to review your existing setup, retain important business phone numbers where possible, and minimise disruption during the transition.
If you’re looking for a modern Microsoft Teams calling solution, explore our Microsoft Teams & Flex to learn how Broadconnect helps businesses migrate with confidence.

Is Telstra Calling for Office 365 Being Discontinued?
Yes. Telstra Calling for Office 365 is being withdrawn, requiring businesses that currently rely on the service to transition to an alternative Microsoft Teams calling solution before the service ends. Although the withdrawal affects the telephony component, Microsoft Teams will continue to operate as your collaboration platform for chat, meetings, and file sharing.
Planning your migration early allows your business to assess replacement options, prepare users, review phone numbers, and complete testing before the existing service is withdrawn.
| Timeline | What Happens |
|---|---|
| Current | Review your existing Teams calling environment |
| Before withdrawal | Choose a replacement calling solution and prepare migration |
| Before service ends | Complete migration and verify all calling services |
What Does This Mean for Businesses Using Microsoft Teams?
The withdrawal of Telstra Calling for Office 365 does not mean you need to replace Microsoft Teams. Instead, businesses should focus on replacing the calling connectivity that currently supports external phone calls.
Before migrating, it’s important to review your current environment to understand how your business uses Microsoft Teams for telephony.
Consider reviewing:
- Existing Teams users
- Business phone numbers
- Call queues and auto attendants
- Reception and call routing
- Current Microsoft licensing
- Existing integrations
Understanding your existing setup helps ensure a smoother migration and reduces the risk of missing important configurations.
To learn more about Teams calling solutions, visit our Microsoft Teams & Flex .
What Can Replace Telstra Calling for Office 365?
Several Microsoft Teams-compatible calling options are available, and the right solution depends on your business requirements, technical environment, and future growth plans.
| Option | What it Does | Suitable For |
|---|---|---|
| Teams Phone | Adds business telephony capabilities to Microsoft Teams | Businesses wanting Teams as their primary phone system |
| Direct Routing | Connects Teams with external voice providers | Businesses requiring flexibility, integrations, and advanced calling |
| Operator Connect | Connects Teams with participating telecom operators | Businesses wanting a simplified operator-managed solution |
There isn’t a single solution that suits every organisation. Factors such as existing business numbers, call routing, Microsoft licensing, integrations, and future scalability should all be considered before making a decision.
Learn more about Microsoft Teams & Flex, our SIP Trunking service, or compare Direct Routing vs Operator Connect to determine which approach best suits your business.
How to Migrate from Telstra Calling for Office 365?
Migrating away from Telstra Calling for Office 365 is easier when approached with a structured plan.
- Review your existing TCO365 and Microsoft Teams environment.
- Identify users, business phone numbers, and existing call flows.
- Select the most appropriate Microsoft Teams calling replacement.
- Confirm Microsoft licensing and technical requirements.
- Plan number porting, configuration, and testing.
- Complete the migration before the existing service is withdrawn.
Following these steps helps reduce downtime while ensuring your business communications continue to operate as expected.
To simplify your migration, explore our Microsoft Teams & Flex and SIP Trunking services.
Can You Keep Your Existing Business Phone Numbers?
In many cases, yes. Businesses can often retain their existing business phone numbers when migrating away from Telstra Calling for Office 365 through a number porting process.
However, portability depends on the specific numbers, services, and carrier requirements involved. Before starting your migration, review all business numbers—including main office numbers, direct lines, and shared service numbers—to determine what can be transferred.
Choosing a Microsoft Teams Calling Provider
Choosing the right provider can make your migration significantly easier while helping ensure your Teams calling environment meets your business requirements.
Look for a provider that offers:
- Microsoft Teams expertise
- End-to-end migration support
- Number porting assistance
- Australian-based support
- Direct Routing and Operator Connect capability
- Scalable business solutions
- Ongoing technical support
Learn how Broadconnect supports Australian businesses through our Business Phone Systems solutions.
Telstra Calling for Office 365 Replacement – Quick Answer
Telstra Calling for Office 365 is being withdrawn, but businesses do not need to stop using Microsoft Teams. Instead, organisations can replace the existing calling connectivity while continuing to use Microsoft Teams for collaboration and business communications.
The most suitable replacement depends on your users, business numbers, Microsoft licensing, call routing requirements, and future communication needs. Planning your migration early helps minimise disruption and ensures a smooth transition.
Frequently Asked Questions
Before planning your migration, here are answers to some of the most common questions businesses ask about Telstra Calling for Office 365.
1. Is Telstra Calling for Office 365 being discontinued?
Yes. Telstra Calling for Office 365 is being withdrawn, requiring businesses to migrate to another Microsoft Teams-compatible calling solution before the service ends.
2. When is Telstra Calling for Office 365 ending?
Telstra has announced the withdrawal of the service. Businesses should begin planning their migration as early as possible to avoid disruptions.
3. What replaces Telstra Calling for Office 365?
Common alternatives include Microsoft Teams Phone, Direct Routing, and Operator Connect, depending on your business requirements.
4. Can I continue using Microsoft Teams?
Yes. Microsoft Teams continues to operate as your collaboration platform. Only the calling connectivity needs to be replaced.
5. Can I keep my existing business phone numbers?
In many cases, yes. Existing numbers can often be ported, although eligibility depends on your current services and provider.
Need to Replace Telstra Calling for Office 365?
If your business currently uses Telstra Calling for Office 365, Broadconnect can assess your Microsoft Teams calling environment and recommend the most suitable replacement solution. Our team can help review your users, business numbers, call flows, licensing, and migration requirements to ensure a smooth transition before the existing service is withdrawn.

Call: 1300 880 330
Email: hello@broadconnect.com.au
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