I need a detailed quote on using Teams as our phone system in the company

Question

I have 5 Microsoft Business Standard licences.

I want to use Teams as our phone system.

We will be using one Number where all calls will come through and all outgoing call will use the same number.
How much do I need to pay? There will be 5 users using the Teams phone and we will use 1 number.

Answer 1

Dear @Aziz Bamyani,

Teams Phone has two cost components:

• Teams Phone capability (PBX features) via a Teams Phone license/plan.
• PSTN connectivity + phone number (how calls reach the public telephone network), using one of:
  • Microsoft Calling Plans (Microsoft is your carrier), or
  • Operator Connect (a participating carrier), or
  • Direct Routing (your own SBC/carrier).

Microsoft explicitly notes that PSTN connectivity is separate from the Teams Phone license—you need both to call regular phone numbers.

Here are some references:

• Microsoft Teams add-on licenses - Microsoft Teams | Microsoft Learn
• Teams Phone features - Microsoft Teams | Microsoft Learn
• Set up Microsoft Calling Plans - Microsoft Teams | Microsoft Learn

To have one main number for inbound and outbound in Teams, you usually configure:

A resource account with the main phone number, and connect it to an Auto Attendant / Call Queue for inbound routing.

Users are enabled for voice and can place outbound calls showing that shared number (commonly via Shared Calling / caller ID configuration depending on your PSTN option).

Licensing-wise:

Each of the 5 users still needs a Teams Phone license to be “voice enabled.”

Here are some options for you:

• If you want one main number for everything and the least complexity: choose Calling Plan is typically the cleanest: Teams Phone portion with your existing Business Standard
• If you want one number but expect light outbound calling: Pay‑as‑you‑go and usage charges.
• If you already have (or prefer) a telecom provider: bring your own carrier (Operator Connect / Direct Routing) and carrier charges, using Operator Connect or Direct Routing.

Here is a reference: Microsoft Teams Phone—Cloud Phone System | Microsoft Teams [21ad-246b-924-7ed5]

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

Teams Phone requires additional licensing and a PSTN connectivity option; exact pricing (currency, taxes, carrier charges) is not provided in the context, so only the required components can be outlined.

With 5 Microsoft 365 Business Standard licenses and a single shared phone number for all inbound and outbound calls, the setup would typically look like this:

1. Base Microsoft 365 licensing

• Existing: 5 × Microsoft 365 Business Standard (already include Teams, but not Teams Phone / Phone System).

2. Teams Phone licensing for the 5 users Each user who needs to make/receive PSTN calls must have:

• Teams and
• Microsoft 365 Phone System (Teams Phone) rights.

From the context, examples of valid combinations include:

• A Microsoft Teams Enterprise license combined with Microsoft Teams Phone Standard
• A Microsoft 365 E5 (no Teams) license (includes Microsoft 365 Phone System)
• A legacy Microsoft 365 E5 license (includes Microsoft Teams and Microsoft 365 Phone System)
• Office 365 F3 + Microsoft Teams Phone Standard for Frontline Workers

In a Business Standard scenario, the typical pattern is:

• Keep Microsoft 365 Business Standard as the base license
• Add a Teams Phone add-on (for example, Microsoft Teams Phone Standard or the “Teams Phone with Calling Plan” bundle where available)

For 5 users, this means:

• 5 × Teams Phone licenses (add-ons) on top of the existing 5 Business Standard licenses.

3. PSTN connectivity and phone number To use Teams as a phone system with PSTN calling, a PSTN solution is required in addition to Teams Phone licensing:

• Option A – Microsoft as carrier:
  • Use “Teams Phone with Calling Plan” bundle or
  • Use Teams Phone + separate Microsoft Calling Plan licenses.
  • Calling Plan licenses determine how many user (subscriber) phone numbers can be acquired from Microsoft. The number of user numbers is:
    • Total Domestic/International Calling Plan licenses × 1.1 + 10 extra numbers.
  • For 5 users on Calling Plans, the entitlement would be more than enough to obtain 1 user phone number.
• Option B – Third-party carrier (Operator Connect or Direct Routing):
  • Teams Phone licenses are still required for the 5 users.
  • PSTN costs (including the single phone number) are paid directly to the chosen operator; Microsoft does not require additional PSTN licensing in this case.

4. Single shared phone number for all 5 users To have one number that all 5 users share for inbound and outbound calls:

• Create a resource account and assign it a Teams Phone license and a phone number.
• Configure Shared Calling so multiple users share that single phone number:
  • A resource account is provisioned with Teams Phone and a telephone number.
  • A policy is granted to users that allows them to use the resource account’s number for outbound calls.

This means:

• 1 × Teams Phone–licensed resource account with the single phone number.
• 5 × Teams Phone–licensed user accounts that use that shared number.

5. Cost components to budget for The total monthly cost will be the sum of:

1. Existing 5 × Microsoft 365 Business Standard licenses (already owned).
2. 5 × Teams Phone (Phone System) licenses for the users.
3. 1 × Teams Phone license for the resource account (for the shared number).
4. PSTN connectivity:
   • Either Calling Plan licenses from Microsoft (per user or pay-as-you-go, depending on choice and availability), or
   • Operator Connect/Direct Routing charges from a third-party carrier.

Exact per-license prices, currency, and taxes are not provided in the context and depend on region and commercial agreement. To get a detailed quote in currency terms, use the Microsoft 365 admin billing portal or contact a Microsoft partner/reseller, specifying:

• 5 × Microsoft 365 Business Standard (existing)
• 6 × Teams Phone (5 users + 1 resource account)
• Chosen PSTN option (Microsoft Calling Plan vs. Operator Connect/Direct Routing) and 1 shared phone number.

---

References:

• Teams Phone licensing
• Get Microsoft Teams Calling Plan phone numbers for your tenant
• Teams interoperability pricing
• Cost and connectivity options for Teams Phone extensibility