Teams telephony migration

Hi @Seerat Fatma

I understand that your environment is already running Teams telephony with Direct Routing, and you're now preparing to migrate an additional site from their current phone system over to Teams. Since this type of migration is environment-specific and involves coordination between multiple parties (Teams admin, SBC team, and the carrier handling the number porting), I'd recommend starting by clarifying the following:

Key things to align on:

• What's the full list of phone numbers being ported, and the expected porting date? Your Teams configuration should be ready before this date.
• Are there any call flows on the old system (auto attendants, call queues, hunt groups, business-hours/after-hours routing) that need to be recreated in Teams?
• Do all users at this site already have the Teams Phone license assigned?
• Is the SBC team aware of the migration and ready to configure routing for the new number range?
• Has the site's network been assessed for voice quality? (bandwidth, QoS, latency)
• What are the emergency calling requirements for this location?

General preparation steps on the Teams side:

• Verify all migrating users have the Teams Phone license.
• Review your existing voice routing policies and voice routes to confirm they support the new number range.
• Recreate any call queues, auto attendants, or call flows in the Teams Admin Center.
• Coordinate closely with the SBC team on timeline and routing configuration.
• Assign phone numbers to users once porting is complete.
• Test with a small group before full rollout if possible.

For more details, please refer to: Plan Direct Routing

Configure Direct Routing

That said, since this migration involves live phone systems and number porting, if you run any issue or have any difficulty while setting up, please don't hesitate to reach out to Microsoft Support by submitting a support request through the Microsoft 365 Admin Center > Support > Help & Support. for guidance tailored to your specific environment.

Here’s what your Microsoft 365 Global Admin (IT Admin) should do next:       

• Submit a Service Request: The Global Admin should create a service request with Microsoft support to get advanced technical assistance and diagnostics. For detailed instructions on how to get support, please refer to Get support - Microsoft 365 admin.   
• Find Your Microsoft 365 Admin: If you’re unsure who the Global Admin is within your organization, you can find guidance on locating them here: How do I find my Microsoft 365 admin? - Microsoft Support.
• If your subscription is managed through a Microsoft partner or reseller, they can also assist with opening a support request and liaising with Microsoft on your behalf.

Note: If you’re an end-user, please coordinate with your Office 365 Global Administrator to handle these steps.     

Hopefully it clears thing up and if you have any other questions or need further assistance, feel free to ask.

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