Microsoft Teams Phone: How Toronto Firms Are Replacing Their Legacy Phone Systems

Most professional services firms still operate some version of the same phone system they installed a decade ago. A physical PBX in a server room. Desk phones that barely get used. Separate contracts for hardware, maintenance, and dial-tone service. A dedicated system for voicemail that nobody checks. Annual maintenance fees for a system that does less than what's already sitting on every employee's laptop.

Microsoft Teams Phone changes all of that. It replaces the PBX, the desk phones, the voicemail system, and the dial-tone contract with a single, integrated platform that lives inside Microsoft 365 — where your team already works. For Toronto firms already running Microsoft 365 Business Premium or higher, the economics are compelling and the migration path is clearer than most people realize.

What Microsoft Teams Phone actually is

Microsoft Teams Phone (formerly Teams Phone System) is a cloud-based private branch exchange (PBX) that runs entirely inside Microsoft 365. It gives your employees a real phone number, the ability to make and receive external calls, voicemail, call forwarding, auto-attendant menus, and call queues — all within the Teams interface they're already using for chat, video, and file sharing.

There are no additional physical servers, no separate PBX hardware, and no proprietary desk phones required (though certified Teams phones are available if staff prefer a physical handset). Calls can be made from any device — laptop, tablet, or mobile — which is particularly valuable for hybrid and remote teams.

Why professional services firms in Toronto are making the move

1. Cost consolidation

Most firms pay separately for their PBX hardware, PBX maintenance, SIP trunking or PSTN service, desk phone hardware and support, and their conferencing platform. Teams Phone consolidates most of these line items into a per-user monthly cost that's typically lower than the sum of what firms are already paying. For a 30–50 person professional services firm in Toronto, the savings often range from $1,500 to $4,000 per month when all legacy contracts are factored in.

2. Unified communications — actually unified

With Teams Phone, every conversation — chat, video, voice, voicemail — lives in one platform. Staff don't switch between systems depending on how a client reaches them. Calls from external numbers ring in Teams. Voicemails appear as transcribed messages. Call history is searchable. For firms managing client relationships across multiple channels, this simplification has a real impact on response times and professionalism.

3. Hybrid-first flexibility

A traditional PBX tethers your phone system to a physical location. Teams Phone doesn't care where your employees are. A staff member working from home has the same phone number, the same call handling, and the same experience as someone sitting at a desk in the office. For firms managing hybrid work arrangements — which is most Toronto professional services firms in 2026 — this is a significant operational advantage.

4. Business continuity built in

When a physical PBX fails, your phones go down. When power or internet is disrupted at your office, your phones go down. Teams Phone runs on Microsoft's Azure infrastructure with 99.99% uptime SLAs, and because calls can be routed to mobile devices, a disruption at your office doesn't necessarily mean a disruption for your clients.

How Teams Phone connects to the public phone network

Microsoft Teams Phone requires a connection to the public switched telephone network (PSTN) to make and receive calls to and from regular phone numbers. There are two primary ways to set this up:

• ✓Microsoft Calling Plans — Microsoft provides the dial-tone directly. Simple, fully managed, no third-party carrier required. Best for firms that want minimal complexity and don't have existing SIP trunking contracts.
• ✓Operator Connect or Direct Routing — Your existing Canadian telecom carrier (or a new one) provides the dial-tone and connects to Teams Phone. This gives more flexibility for Canadian number portability, existing contracts, and specific dial plan requirements.

For most Toronto professional services firms, Operator Connect through a Canadian carrier is the recommended path — it preserves your existing phone numbers, leverages local carrier relationships, and integrates cleanly with Teams Phone without requiring you to manage SIP infrastructure yourself.

What the migration process looks like

A well-managed Teams Phone migration for a 25–60 person firm typically follows this sequence:

1. 1.Audit current telephony — document all numbers, extensions, auto-attendant configurations, call queues, and existing contracts.
2. 2.Confirm Microsoft 365 licensing — Teams Phone requires an add-on license (Teams Phone Standard) on top of Microsoft 365. Many firms on Business Premium only need the add-on.
3. 3.Design the call flow — map out auto-attendant menus, call queues, business hours routing, and emergency calling configuration.
4. 4.Port phone numbers — transfer existing numbers to Microsoft or the chosen carrier. This typically takes 2–4 weeks and is the longest part of the process.
5. 5.Configure and test — set up all users, call policies, and routing. Test internally and with external calls before cutover.
6. 6.Cutover — typically done outside business hours. The old system is decommissioned, the new system goes live.
7. 7.Training and support — brief training sessions to ensure staff are comfortable with the Teams Phone interface, especially for those who previously used desk phones.

Is Teams Phone right for your firm?

Teams Phone is a strong fit for most Toronto professional services firms that are already using Microsoft 365. It makes particular sense if:

• ✓Your PBX is aging and approaching end-of-life or end-of-support
• ✓You have a hybrid or remote workforce that needs phone access from anywhere
• ✓You're paying for separate conferencing, calling, and collaboration platforms
• ✓You want to eliminate physical hardware dependencies from your phone system
• ✓You're already on Microsoft 365 Business Premium or higher