Teams Phone: Microsoft Calling Plan vs Operator Connect vs Direct Routing. How to Choose for 10, 50 and 200 Users

Microsoft documents four ways to bring public phone network (PSTN) calling into Teams. All sit on the same Teams Phone Standard license, or a suite that includes it, and Microsoft's documentation states that a tenant can run more than one at once.

• Calling Plan. Microsoft is your carrier. You buy or port numbers in the Teams admin center, Microsoft delivers the calls and bills the minutes. Nothing to host, no third-party contract.
• Operator Connect. A carrier certified by Microsoft delivers the calls and runs the session border controllers. You enable the operator in the Teams admin center under Voice and assign the numbers it provisions. The operator bills numbers and minutes.
• Direct Routing. Any carrier delivers the calls through a certified session border controller (SBC) that you own, host in Azure or rent from a partner as a service. It is the most flexible option and the only one where voice infrastructure is your responsibility. The fourth, Teams Phone Mobile, ties a user's cell number to Teams and covers user numbers only, not service numbers, so it complements one of the other three. For a US business under 500 seats: Calling Plan or Operator Connect for most users, and Direct Routing only where something specific forces it.

Every user who makes or receives external calls needs Teams Phone Standard, as an add-on or inside Microsoft 365 E5, which includes it (as reported; see Sources). Microsoft list price, September 2026 price list:

• Teams Phone Standard: $120 per user per year on an annual commitment ($10 a month), or $12 a month on a monthly term.
• Teams Phone with Calling Plan (country zone 1, US): $204 per user per year ($17 a month); Teams Phone Standard and a domestic plan in one SKU.
• Microsoft Teams Domestic Calling Plan (customers in US, UK and Canada): $96 per user per year ($8 a month) on top of Teams Phone Standard.
• Microsoft Teams Domestic and International Calling Plan: $288 per user per year ($24 a month) on top of Teams Phone Standard.

Microsoft's plans include a monthly outbound minute allowance per user, pooled across users on the same plan; third-party summaries of Microsoft's documentation put the domestic pool at 3,000 minutes per user and the international pool at 600, so verify the current allowance on Microsoft Learn. Calls beyond the pool, and every call on the pay-as-you-go plan, which includes no minutes, are metered through Communication Credits or post-usage billing. Those charges are always yours and never appear on a license quote.

Operator Connect and Direct Routing move number and minute charges to the carrier; ask for its rate card. Direct Routing adds the SBC: an appliance and support contract if you own it, or a monthly fee if a partner hosts it. The Teams Phone calculator puts the Microsoft side of each model next to a carrier quote.

1. Number porting. All three port numbers: Calling Plan into Microsoft, the other two to the carrier; if the carrier already holds your numbers there is nothing to port. Our guide to porting numbers to Teams Phone covers the paperwork.
2. International calling. A few users calling abroad fit the Domestic and International plan. A sales floor calling abroad all day, or offices where Microsoft does not sell Calling Plan, fit an operator with the right coverage.
3. Contact center. Auto attendants and call queues come with Teams Phone under any model. A real contact center is a separate product, and some vendors require Direct Routing to their platform. Decide the contact center first.
4. Existing carrier contracts. A SIP trunk with two years left is a reason to look at Direct Routing, or at that carrier's Operator Connect offering. A contract ending in a few months is not a reason to keep the carrier.
5. SBC ownership. If nobody on your team wants to patch firmware, renew certificates and read SIP traces, do not own an SBC. Operator Connect removes it; a hosted Direct Routing partner owns it for you.
6. E911. All three support dynamic emergency calling in Teams, but the party delivering your 911 call differs, and with Direct Routing the emergency routing on the SBC is your design.

Ten users, one office, US calling only. Buy Teams Phone with Calling Plan, port the main number and the direct lines, build one auto attendant and one call queue, and stop. There is no carrier to manage and the renewal is one line on the Microsoft invoice. A business on Teams Essentials rather than a Microsoft 365 suite has the Teams Essentials with Phone bundles for the same purpose.

Fifty users, two or three sites, some international calls, a carrier contract ending. Operator Connect from a certified operator is our usual recommendation: the operator ports the numbers, carries the international rate card and appears as a page in the Teams admin center, and you still manage users in one place.

Two hundred users, analog door phones and fax lines, a legacy PBX that must run alongside Teams for a year, and a contact center. This is where Direct Routing earns its complexity: a partner-hosted SBC bridges the PBX, the analog adapters and the SIP trunk while users move in waves. Most organizations this size still put the majority on Operator Connect and reserve Direct Routing for the exceptions.

Whatever you choose, count licenses against real callers before the annual term starts; the Teams Phone renewal checklist explains why the quantity you confirm under NCE is the quantity you pay for.

Two US federal laws apply to a multi-line telephone system, which is what Teams Phone becomes once it reaches the public network. Kari's Law requires that a user can dial 911 directly, with no prefix, and that a designated person or location is notified when a 911 call is placed. RAY BAUM's Act requires that a dispatchable location, the street address plus the floor, suite or room a responder needs, is sent with the call. (Both as reported by carrier and telecom publishers; see Sources, and confirm the current rules on fcc.gov.)

In Teams this means an emergency address on every number and, beyond a single small office, dynamic emergency calling: the tenant learns the user's location from the network (subnets, Wi-Fi access points, switch ports) and sends it with the call. Under Calling Plan Microsoft carries the call to the answering point; under Operator Connect the operator does; under Direct Routing the SBC and your carrier do. None of this configures itself when you assign the license, and most tenants we inspect have the licenses right and the emergency locations wrong.

• A number inventory: every direct line, service number, fax line and 800-series number, with the carrier and account that holds it. Ports fail on numbers nobody knew about.
• A recent carrier bill or customer service record for the letter of authorization.
• Call flows on paper: who answers the main number, business hours, holidays, overflow, voicemail.
• Network readiness at each site, and a device decision: headsets and the Teams apps cover most users.
• For Operator Connect, the operator's onboarding form and a porting contact. For Direct Routing, the SBC or hosting partner, a public certificate and the SIP trunk details.

If the system is already live and the question is who keeps it running, the Managed Microsoft Teams Phone Service handles moves, adds and changes, carrier liaison and E911 address upkeep at $4 per Teams Phone user per month.

Do I need a Teams Phone license with Direct Routing?

Yes. Microsoft's Direct Routing planning documentation lists Teams Phone licenses for each user, a certified SBC and a carrier connection as the minimum (as reported). Direct Routing replaces the calling plan, not the phone system license.

Can I use Calling Plan for some users and Operator Connect for others?

Yes. Microsoft supports more than one connectivity type in the same tenant. Each user has one route, set by the number and policy assigned, so a site on Operator Connect and a remote group on Calling Plan can coexist.

Does Microsoft 365 E5 already include Teams Phone?

E5 includes Teams Phone Standard (as reported), so those users do not need the add-on. They still need connectivity: a calling plan, an operator or Direct Routing. E5 does not include minutes.

Does Teams Premium add anything to calling?

No. Teams Premium is a meetings add-on: recap, watermarks, webinars, branded meetings. Our Teams Premium guide explains what it covers; it does not include Teams Phone or a calling plan.

• Microsoft Learn, "PSTN connectivity options", "Plan Direct Routing", "Plan for Operator Connect", "Microsoft Teams Calling Plans", "What are Communication Credits?" and "Teams Phone licensing", as reported by search excerpts and the Pure IP, Cerium Networks, UC Today, Tom Talks, Dataprise and Dstny summaries opened 2026-09-27; Microsoft Learn was not reachable from our environment, so verify there
• Telnyx, "Why E911 matters for Microsoft Teams compliance", and BCM One, "E911 Requirements for Microsoft Teams", as reported by search excerpts opened 2026-09-27 (Kari's Law and RAY BAUM's Act)
• Microsoft Commercial price list, September 2026 (all list prices above)
• IT Partner service pages: content/services/ITPWW170IMPOT, ITPWW1070IMPOT and ITPWW420MSPRC; IT Partner blog: renewing-teams-phone-and-calling-plans-under-nce-the-checklist
• IT Partner engineering notes, September 2026