Compare · Microsoft Teams
Thirdlane vs Microsoft Teams Phone: a platform you operate, not a SaaS you rent.
Microsoft Teams Phone is a credible telephony product for a Microsoft 365 customer who wants voice grafted onto the chat surface their staff already use. For that buyer, it’s the path of least resistance — one vendor, one bill, one identity provider. We’re not going to pretend otherwise.
What Teams Phone is not is a platform you can operate as a service provider. It is single-tenant by design (one Microsoft 365 organization per customer), Microsoft owns the billing and the roadmap, and the partner economics are referral margins rather than operator margins. The MSP and UCaaS provider audience needs the opposite: a multi-tenant platform they run, white-label, sell, and own the customer relationship on. That’s where Thirdlane lives.
The wedge: who operates the platform
Both vendors will say “unified communications” in their datasheet. The architectural question is who runs the platform and who owns the customer.
Teams Phone: Microsoft-operated SaaS
Microsoft hosts the platform, owns the roadmap, owns the billing relationship, and ships the apps under the Microsoft brand. Partners introduce, integrate, and bill on top — but the core product is rented, not operated. The customer’s tenancy is their Microsoft 365 organization.
Thirdlane: operator-run platform
You run the platform. Tenants are logical inside one install, the apps ship under your brand, and you set the pricing, the SLA, and the roadmap. Microsoft is one identity provider in a list of supported OIDC IdPs — not the platform owner.
The Direct Routing ceiling
Teams Phone is great until you need anything Microsoft didn’t ship.
Three things happen at the same time on serious deployments. The customer wants real call recording with their own S3 bucket, and now you’re shopping for a compliance-recording partner to integrate via the Compliance Recording API. The customer wants advanced IVR or omnichannel (SMS, WhatsApp, chat in one queue), and now you’re standing up Azure Communication Services or a partner CCaaS. The customer wants the operator’s own brand on the app, and there is no such option — the Teams app is the Teams app.
On Thirdlane, those are default features: native WhatsApp via Meta direct API, S3 recording across seven providers with per-tenant BYOS, a unified omnichannel queue model, and Connect apps published under your brand on the App Store and Google Play.
Side by side
| Area | Thirdlane | Microsoft Teams Phone |
|---|---|---|
| Tenancy model | True multi-tenant. One platform, logical tenant isolation, one upgrade path. An MSP can host hundreds of customers on the same install. | Single-tenant per Microsoft 365 organization. Each end-customer is a separate M365 tenant; an MSP-style host model is not part of the product. |
| MSP / channel economics | Per-tenant licensing built for service providers. White-label-first. Margins scale with the operator, not the platform vendor. | Per-user SKU through Microsoft (or via CSP partner with thin margins). Microsoft owns the customer billing relationship; resellers earn referral-style margin rather than operator margin. |
| Identity binding | OIDC SSO across every surface (Configuration Manager, User Portal, Connect web/desktop/mobile). Pre-named: Okta, Azure AD, Google Workspace, Keycloak, Authentik, Zoho. Plus any OIDC IdP. | Identity is tied to Microsoft Entra ID (the customer must live in Microsoft 365). Cross-tenant or non-Microsoft identity is not a first-class scenario for Teams Phone. |
| Telephony core | Carrier-grade SIP, Asterisk-based, open dialplan, AMI/AGI hooks, broad codec/protocol support, decades of carrier deployment behind it. | Proprietary Microsoft telephony stack. PSTN connectivity is via Microsoft Calling Plans, Operator Connect, or Direct Routing — and Direct Routing requires the operator to run a session border controller and certified SBC firmware. |
| Custom IVR / dialplan flexibility | Full visual IVR builder with conditional logic, time conditions, queues, voicemail trees, and dialplan scripting for advanced flows. | Auto attendants and call queues are UI-driven and intentionally simple. Anything more advanced typically requires a Power Automate / Bot Framework bolt-on or a third-party voice app platform. |
| Native WhatsApp Business | Native Meta WABA integration. Thirdlane is its own WhatsApp Business Solution Provider — direct API, no broker. | Not a native channel. WhatsApp routing into Teams requires Azure Communication Services or a third-party messaging integration; it is not part of the Teams Phone product. |
| Recording & storage | S3-compatible object storage across seven providers (AWS, Wasabi, Backblaze B2, DigitalOcean Spaces, Cloudflare R2, MinIO, Garage). Per-tenant BYOS for compliance-bound customers. | Call recording lives in the user OneDrive / SharePoint by default. Compliance recording with BYOS requires a third-party recording partner (Verint, NICE, etc.) integrated via the Teams Compliance Recording API. |
| Built-in CRM | Full CRM module: Contacts, Accounts, Leads, Deals, Lists, Tasks, Campaigns, Custom Fields. CSV import, REST API, OpenAPI 3.1 spec. | No CRM. Teams Phone integrates with Dynamics 365 (separate SKU) or via third-party CRM integrations published in the Teams app store. |
| Omnichannel contact center | Voice, SMS, WhatsApp, and chat through a single queue model with disposition codes, ACW policies, and three-level inheritance. | Native contact center is intentionally light. Microsoft positions Dynamics 365 Contact Center or partner CCaaS (Nice, Genesys, Five9) for serious omnichannel workloads. |
| Agent apps | Connect web, desktop (Electron), iOS, and Android apps — white-labelled per tenant on the app stores. Same UX across surfaces. | Teams web / desktop / mobile. Apps are Microsoft-branded. Custom branding is limited to per-tenant theming inside Teams; the app icon and name on the store remain Microsoft. |
| White-label | Per-tenant logo, brand colors, Connect login page, email templates, and Connect apps published under your brand on app stores. | Not supported as a partner model. Teams cannot be re-skinned and re-published as a partner-branded app. |
| APIs | OpenAPI 3.1 specs, interactive Scalar docs, REST APIs for Organization, CRM, telephony operations, system management, and webhooks. | Microsoft Graph + Teams Phone APIs. Surface is broad but oriented around Microsoft 365 administration; multi-tenant operator scenarios are not a first-class concern. |
| Deployment | On-prem, private cloud, public cloud, or Thirdlane Cloud (Early Access). Operator chooses where the platform runs. | Microsoft cloud only. There is no on-prem or self-hosted Teams Phone deployment option. |
When Microsoft Teams Phone is the right call
We don’t pretend Teams Phone never wins — it does, often, in a specific shape of deployment. The scenarios where it’s the better answer aren’t MSP scenarios:
- A Microsoft 365–centric enterprise that already pays for E5 (or M365 plus Teams Phone Standard) and just wants telephony bolted onto the chat surface staff already use.
- Low to moderate call volume with simple call flows — auto attendants, hunt groups, voicemail — and no requirement for white-label apps, multi-tenant pricing, or operator-grade APIs.
- A buyer with no MSP / channel intent. Teams Phone is built for the end customer; running it as a multi-tenant service for other companies is not the supported model.
Considering Teams Phone for your MSP?
If you’re an MSP weighing Teams Phone as the voice product you’ll sell to your customers, the math worth running is the operator-vs-reseller one. Teams Phone keeps Microsoft in the customer relationship; Thirdlane keeps you in it. Send us your customer profile and target margin and we’ll come back with a sized comparison — platform footprint, per-tenant cost, and an honest view of where Teams Phone is the better fit and where it isn’t.
Comparisons are based on each vendor’s public documentation and pricing pages. Last reviewed: 2026.