Microsoft Teams Phone With Direct Routing: How to Replace Your Business Phone System

What Teams Phone Replaces

A traditional setup has a lot of moving parts: desk phones, an on-premises or hosted PBX, a carrier contract, a voicemail system, and an auto-attendant box that only one person knows how to change. Teams Phone collapses those into the Teams client. Users make and take calls from the Teams desktop app, the Teams mobile app, a web browser, or Teams-certified desk phones and headsets, with the same identity and security policies as the rest of Microsoft 365 support in your tenant.

Three Ways to Connect Teams to the Phone Network

Every user who makes external calls needs a Microsoft Teams Phone license. Connecting Teams to the public phone network then happens one of three ways:

• Microsoft Calling Plans: Microsoft acts as the carrier and supplies numbers and minutes directly.
• Operator Connect: a participating carrier connects its service to Teams through the Teams admin center.
• Direct Routing: a voice provider connects its own phone network to Teams through certified session border controllers, as described in Microsoft’s Direct Routing planning documentation.

All three put calling inside Teams. The difference is who runs the voice network behind it, and how much control you get over numbers, routing, and features.

Why Direct Routing

Direct Routing puts one provider in charge of both sides of the call: the Teams configuration and the voice network it connects to. That matters in practice:

• Your numbers stay yours. Existing main lines, DIDs, toll-free, and vanity numbers are ported rather than replaced.
• Routing built for how you answer calls. Call queues, hunt groups, time-of-day routing, holiday schedules, and auto-attendants in more than one language.
• Contact-center depth. High-volume support teams get queue reporting on wait times, abandoned calls, and service levels, not just a call log.
• One number to call. When audio drops or a queue misroutes, the same provider owns the carrier side and the Teams side, so nobody points fingers.

How VirtuWorks Delivers Teams Phone

VirtuWorks is the voice provider. We operate our own cloud PBX and voice platform, connected to your Teams tenant through Direct Routing, and handle number porting, DID assignment, E911 emergency addressing, call routing, and ongoing administration. Business VoIP is priced per user, with Teams Phone licensing and calling included, and routine moves, adds, and changes are covered rather than invoiced as projects.

Because calling runs inside Microsoft 365, it inherits your MFA, Conditional Access, and security baseline. New hires get a number on day one through the same automated onboarding that provisions their mailbox, and departing employees lose calling access the day their account is disabled. Call recording and transcription are available and stored under your tenant’s retention policies. The monthly executive report covers call volume, average handle time, and service levels on critical queues, and the same US-based team that supports your business VoIP phone system supports the rest of your IT.

Moving Off a Legacy Phone System

A structured migration runs about six weeks:

1. Discovery and number audit (week 0 to 1): every DID, toll-free and vanity number, auto-attendant, queue, and device is inventoried, and porting risks are flagged in writing.
2. Teams Phone setup (week 1 to 2): Direct Routing, dial plans, emergency addresses, voicemail, recording policy, and caller ID are configured, and pilot users start test calling.
3. Porting in tested batches (week 2 to 4): numbers move in groups, never in one risky cutover, with queues and auto-attendants rebuilt to match or improve your current call flows.
4. Training (week 4 to 5): role-based sessions for receptionists, queue agents, power users, and executives.
5. Steady state (week 5 onward): support moves to the standard helpdesk SLA, and routing is tuned using real call data.

What to Check Before You Switch

• Internet resilience: a second connection, or confirming calls can fail over to the Teams mobile app or a backup number.
• Emergency addresses: every office location, plus how remote workers’ locations will be handled for E911.
• Analog lines: fax machines, alarm panels, elevators, and door phones that still depend on copper lines.
• Your carrier contract: the termination date and any early-cancellation terms, so porting lines up with the notice period.

Moving voice onto Teams is often part of a wider shift in how teams work, which we covered in how Microsoft 365 supports hybrid work.

Replacing Your Phone System

If your phones still run on a separate system, carrier, and login, consolidating them into Teams is one of the simpler IT changes with a visible payoff for customers. Schedule a Call and we will start with an inventory of your numbers and call flows so you can see exactly what the move involves.