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Already paying for Microsoft 365 and a separate VoIP system? Consolidating to Microsoft Teams Phone usually saves money — here's how to migrate without dropping a single call.
Most NYC businesses we talk to are paying twice. They pay Microsoft for Microsoft 365 (which includes Teams for meetings and chat), and separately they pay RingCentral, Vonage, 8x8, or another VoIP provider for phone service. Two vendors, two bills, two apps your team has to know.
Microsoft Teams Phone with Operator Connect lets you consolidate both into one platform. Your team gets phone calling inside the Teams app they already use. You drop the separate VoIP provider. Often the math works out to lower total cost, plus simpler IT and a better user experience.
Here's how the migration actually works.
Teams Phone is a great fit if:
Teams Phone is probably the wrong fit if:
Before you start migrating, document what you have. This usually takes 1-2 hours:
The Teams Phone setup mirrors your existing system, but with a few opportunities to improve. Decisions to make:
In Teams Phone, every user typically gets a direct dial number. This is a small mindset shift from older systems where most users just had a 3-digit extension. Direct numbers are better — they're externally callable, work with caller ID, and don't require an auto-attendant menu to reach a specific person.
Teams auto-attendants work slightly differently from traditional PBX systems. You can build multi-level menus, time-based routing, and holiday schedules natively in the Teams admin center. We typically redesign the auto-attendant during migration to take advantage of native Teams features.
Teams has built-in call queues for high-volume inbound traffic (front desk, customer support). If your current system has call queues, we map them to Teams call queues with the same routing rules.
Teams voicemail delivers as audio + transcription to email. If your current system has separate voicemail boxes for departments or shared mailboxes, we replicate that in Teams.
Every user who needs to make/receive phone calls in Teams needs a Microsoft Teams Phone license. This is usually the Teams Phone Standard add-on ($8-15/user/month) or included in Microsoft 365 E5.
Common license combinations for NYC businesses:
We often find that businesses are paying for E5 licenses without realizing Teams Phone is already included — so the only additional cost is the calling service through Operator Connect.
In the Microsoft Teams admin center, your IT admin selects Callifi as your Operator Connect provider. The integration is automated by Microsoft — no SBC to deploy, no SIP trunks to configure. Within a day or two, the operator connection is live.
This is the part that takes time. Number porting from your current carrier to Callifi takes 5-10 business days. Your old phone system keeps working normally during the port — we don't cut over until the port completes.
For toll-free numbers, porting is usually faster (3-5 business days). For local DIDs, expect 5-10 business days. For complex setups with hundreds of numbers across multiple carriers, longer.
While porting is in progress, we configure the Teams side:
The Teams Phone experience is mostly intuitive if your team already uses Teams — but there are a few things worth covering:
For NYC businesses, we do this training on-site. 30-45 minutes per group typically covers it. Power users (receptionists, office managers) get more in-depth training.
On cutover day, the number port completes. The old phone system goes dark; calls start arriving in Teams. We're on-site at your office in NYC to monitor the transition, troubleshoot any issues immediately, and make sure your team is comfortable.
Typical cutover window is 1-2 hours. During that window, some calls might briefly route to the old system as the port completes — but in practice, most businesses don't notice the switch happened.
Once Teams Phone is stable (usually 1-2 weeks), cancel your old VoIP provider. Notify them per the contract requirements. Remove their app from your team's computers and phones.
This is where the cost savings start showing up on your bill. Most businesses save 20-40% on monthly communication costs after consolidating to Teams Phone.
Typical timeline from kickoff to cutover for an NYC business with 25-50 users on a standard hosted VoIP system:
Larger or more complex migrations (multiple offices, hundreds of users, custom integrations) take 6-10 weeks. Simpler migrations can compress to 2 weeks.
Forgetting fax: If your business uses fax, plan for it explicitly. Microsoft Teams Phone doesn't include a fax solution. Use CalliFax or another cloud fax service.
Skipping E911 configuration: Teams supports Dynamic E911 but it must be configured. For remote workers, each user's home address should be registered. For multi-floor offices, addresses should include floor and suite. Read more about E911 setup.
Underestimating training: Some users (especially less technical staff) need more than 30 minutes to feel comfortable with the new system. Plan for follow-up training a week after cutover.
Not testing the call queues: Inbound call routing is the highest-impact part of any phone system. Test every call queue, every after-hours flow, and every auto-attendant menu before cutover.
We've migrated dozens of NYC businesses from RingCentral, Vonage, 8x8, and various hosted PBX systems to Microsoft Teams Phone. The process is repeatable, the outcomes are consistent, and the savings are real.
See our Microsoft Teams Phone service or call (212) 423-1234 for a free migration assessment. Send us your current invoice and we'll do an apples-to-apples cost comparison.
