Microsoft Teams Phone for Small Business VoIP
A phone replacement has to work for the receptionist, the mobile employee and the customer who calls after hours. NetSys designs Microsoft Teams Phone around those situations, then scopes the licensing, carrier connection, devices and transfer of existing numbers. We agree how calls will be tested, who can approve the change and where a caller goes when the usual person is unavailable.
The short answer
Microsoft Teams Phone is Microsoft's cloud phone system: it adds business numbers, auto attendants, call queues and voicemail to Teams, so staff make and take calls in the Teams app on a computer or mobile, or on a certified desk phone. Calls to outside numbers also need a connection to the public telephone network: a Microsoft Calling Plan, a carrier through Operator Connect, or Direct Routing through a session border controller. NetSys chooses that connection with you, ports your numbers, builds the call flows and emergency locations, and supports the system month to month.
List what happens when a new prospect, an existing client or a supplier calls. A menu that looks tidy on paper may send an urgent customer into a queue nobody owns. Define business hours, holidays, receptionist coverage, overflow, voicemail ownership and the person responsible for keeping each greeting current.
Bring the current carrier bill, number list and any renewal deadline. Fax, alarms, door entry systems and other special lines need individual review before a PBX or circuit is retired. A familiar Teams app does not mean every existing telephone feature transfers unchanged. We identify those exceptions before choosing devices or agreeing a cutover date.
Requirements, pilot calls, then an agreed cutover
We review the tenant, network and calling requirements, document the proposed carrier path, and test representative users and call flows before the main transfer. Carrier acceptance and number portability determine the transfer schedule. The plan records fallback options, business contacts and checks after activation; keeping an old system available does not make a transferred number active on both systems. Training and handover focus on the actions staff actually perform, such as transferring a caller, updating an absence greeting and escalating a failed call.
What to include in a Teams Phone project
Licensing and carrier decision
Separate the phone capability from the service that carries external calls.
- User and shared-device requirements, existing tenant licenses and resource-account needs
- Microsoft Calling Plans, Operator Connect or Direct Routing compared against regions, call patterns and existing contracts
- Device, headset and network readiness checks for office and remote staff
- A written split between Microsoft, carrier, device and NetSys project or support charges
Call flows and number transfers
Make each important route testable before customers depend on it.
- An inventory of numbers, ownership records, special lines and carrier dependencies
- Auto attendants, queues, business hours, holidays and unavailable-staff behavior
- Pilot inbound, outbound, transfer, voicemail and overflow checks with named business reviewers
- Carrier-confirmed port dates, contingency contacts and retirement checks for the old service
Emergency calling and exceptions
Location and routing depend on the selected service and client.
- Office addresses and location details reviewed against the proposed emergency-calling configuration
- Remote-worker location settings and user guidance for supported devices
- Carrier-supported test procedures and an owner for address or office changes
- Recording, retention, contact-center and specialist-device requirements reviewed separately
Handover and ongoing ownership
The business should know how to change and support the new system.
- Number assignments, call-flow diagrams, configuration decisions and remaining exceptions
- Staff instructions for daily calling tasks and reporting call-quality problems
- Named owners for greetings, queue membership, license changes and carrier escalation
- Response commitments and recurring administration agreed in the service scope
A phone project connected to your Microsoft environment
Fifteen minutes with a NetSys engineer, not a salesperson, and you will know where your microsoft teams phone stands and what it would take to fix it. Call 845-203-3914 or request a call to discuss the scope and next steps.
Who does the work: meet the NetSys team on our About page.
- Calling requirements reviewed alongside tenant identities, devices and network conditions
- A carrier decision explained in terms of your numbers, locations and operating needs
- Business acceptance checks for the call routes customers will actually use
- Documented administration and support responsibilities after cutover
Porting your numbers to Teams, step by step
A number port follows the losing carrier's process as much as Microsoft's. The order we work in:
- Gather the records: a recent invoice from the current carrier showing the account number, billing telephone number, service address and authorized user, plus any account PIN, which mobile numbers require.
- Sort the numbers: which carrier and account each sits on, and which are fax, alarm or other special lines. Fax numbers can move, but Teams will not send faxes on them.
- Match the carrier path: with Microsoft Calling Plans the port order is filed in the Teams admin center; with Operator Connect or Direct Routing the port runs through the carrier you chose.
- Split the order where required: Microsoft takes one port order per account, billing number, service address and number type. A full port closes the old account; a partial port keeps it open.
- Sign and submit: the authorized user signs the letter of authorization, and the losing carrier either confirms a port date (the firm order commitment) or rejects the order with a reason.
- Build before the date: users licensed, auto attendants, call queues and emergency locations configured and tested, ready for the numbers to be assigned.
- Cut over, then cancel: test inbound and outbound calls on the port date, and cancel the old service only after the port completes, because a disconnected number cannot be ported.
Port dates depend on the losing carrier's confirmation, so the cutover plan is built around the firm order commitment rather than a date picked in advance.
Calling Plans, Operator Connect or Direct Routing
Teams Phone needs a connection to the public telephone network, and Microsoft offers four. Who supplies the numbers and the calling is what separates them:
| Option | Who provides numbers and calling | What you need | Usually fits |
|---|---|---|---|
| Microsoft Calling Plan | Microsoft acts as the phone carrier: numbers, calling, U.S. emergency screening and support | A Calling Plan license for each user, alongside Teams Phone | Offices that want one vendor and a per-user bill |
| Operator Connect | A certified carrier from Microsoft's program, switched on in the Teams admin center | A contract with that carrier | Businesses that want to choose or keep a carrier without running telephony equipment |
| Direct Routing | Any carrier, connected through a certified session border controller | The session border controller, run by you, an integrator or a hosted provider, plus a carrier contract | Firms that need a particular carrier, existing contracts or routing the other options do not offer |
| Teams Phone Mobile | A certified mobile operator puts the number on the user's phone SIM onto Teams as well | A contract with that mobile operator; user numbers only | Staff who work mostly from a mobile |
Options can be mixed in one tenant, for example Calling Plans for most staff and Direct Routing for one site. Source: Microsoft Learn, PSTN connectivity options, checked October 2026.
Teams Phone pricing, per user and per line
A Teams Phone bill has several payees. These are the lines to expect; Microsoft and carriers publish their own current list prices:
| Cost line | Who bills it | How it is priced |
|---|---|---|
| Teams Phone license | Microsoft | Per user per month, added to Microsoft 365 Business Basic, Standard or Premium |
| Calling connection | Microsoft with a Calling Plan, or a carrier through Operator Connect or Direct Routing | Per user per month on Microsoft's plans; on the carrier's contract terms otherwise, plus any usage charges |
| Auto attendants and call queues | Microsoft | Teams Phone Resource Account licenses carry no cost; toll-free numbers need Communications Credits |
| Phones and headsets | The device vendor | One-time purchase per device |
| Setup and number porting | NetSys | A project quote based on users, numbers to port and call-flow complexity |
| Support after launch | NetSys | Per user per month under a month-to-month agreement |
Choosing the Microsoft 365 plan the Teams Phone license sits on? Microsoft 365 Business Basic vs Standard.
NetSys publishes no rate card. The quote lists each line separately, including any commitments attached to carrier and software subscriptions.
Where we deliver Microsoft Teams Phone
Microsoft Teams Phone in New York City · Microsoft Teams Phone in New Jersey · Microsoft Teams Phone in Westchester County · Microsoft Teams Phone in Nassau County, NY · Microsoft Teams Phone in Philadelphia. We also support clients remotely wherever their systems run. See all locations and service areas.
Microsoft Teams Phone FAQs
What is Microsoft Teams Phone, and what does it replace?
Teams Phone is Microsoft's cloud PBX: the call control and phone-system features an office phone system used to provide, delivered from Microsoft 365. It replaces the on-premises PBX or hosted phone service, not the need for a carrier, which is why every setup pairs Teams Phone licenses with a Calling Plan, Operator Connect or Direct Routing. Calls between your own staff stay inside Teams and never touch the public telephone network.
How do staff use Microsoft Teams Phone day to day?
Calls ring in the Teams app on computers and mobiles, and on certified Teams desk phones. Staff dial from Teams, transfer a caller to a colleague with or without speaking to them first, and pick up voicemail, which also arrives in their mailbox as an email attachment. Each person can set their own forwarding and simultaneous-ring rules, while auto attendants and call queues send outside callers to the right group. We train staff on the handful of actions they actually use and leave short written instructions.
Is Microsoft Teams Phone a good VoIP option for a small business?
It can be a fit when staff use Teams and need business numbers, shared call handling and calling across supported devices. Compare it with your requirements for contact-center functions, recording, SMS, fax, analog equipment and integrations. Those features may need a separate product, carrier capability or additional licensing. We review the required behavior before recommending the configuration.
Can we keep our numbers, and will there be downtime?
Number transfer depends on the number type, carrier, region and correct account information. We check eligibility and schedule against carrier confirmation, then define fallback communication and post-transfer tests. No provider should promise that every number transfer is interruption-free. Keep the existing service active until the transfer and remaining dependencies have been checked with the carriers.
What determines the cost of Teams Phone setup and support?
The quote depends on users and shared devices, available Microsoft licenses, the carrier connection, calling usage, number transfers, hardware and call-flow complexity. Recording, specialist integrations and contact-center features can add separate costs. Project work and recurring administration should be listed separately, including the commitments attached to carrier and software subscriptions.
How does emergency calling work in Teams Phone?
Each office gets a validated emergency address in the Teams admin center, with places such as a floor added where they help responders, and dynamic emergency calling can route a call using the location the Teams client reports, including for staff at home who turn on location sharing. A security desk notification can bring a named person into an emergency call. Routing details depend on the carrier option, so we test emergency locations with the supported procedure before the first user goes live, and your business keeps addresses current after that.
Who supports Teams Phone after launch?
If you choose ongoing support, NetSys does, per user per month under a month-to-month agreement. Staff report call-quality problems, a wrong greeting or a queue change to the NetSys help desk, staffed seven days a week from 4 a.m. to 11 p.m. Eastern, and our engineers make the change. The handover names who owns greetings, queue membership, license changes and carrier escalation, and response commitments are written into the agreement.
Sources and technical references
- Microsoft: Teams Phone capabilities and licensing boundaries
- Microsoft: options for connecting Teams Phone to telephone carriers
- Microsoft: emergency locations and call routing
- Microsoft: Teams Phone, Calling Plan and add-on licensing options
- Microsoft: Teams Phone Resource Account licenses
- Microsoft: planning a number port to Teams Calling Plans
- Microsoft: submitting a port request in the Teams admin center
- Microsoft: Teams Phone features, including voicemail, call forwarding and transfer
Guides on this topic
- Microsoft 365 tenant administration and support
- Review network readiness for voice and business applications
- Scope AI call intake and human handoffs
- Plan hands-on device installation where needed
- Teams Phone vs RingCentral vs Zoom Phone for business
- Microsoft Teams Phone for small business: common questions answered
Bring the numbers, users and call flows you need to keep.
Tell us your current carrier, office locations, required features and target date. We will identify the licensing, transfer dependencies and pilot needed for a scoped Teams Phone proposal.