Microsoft Teams Phone vs Zoom vs RingCentral: what 1,000 users cost a month

The licence is not the phone line

Microsoft's own documentation draws the line that decides this purchase. A Teams Phone licence entitles a user to enhanced calling inside the tenant and access to the PSTN, but a PSTN solution is separate from that licence: it is what gives the tenant phone numbers and domestic, international and emergency access. Buy the licence alone and internal calls between Teams users still work, handled natively and never reaching the PSTN, which removes operator toll costs for calls that stay inside the organisation. Buy it expecting to dial out and you have bought half a phone system.

That split is the whole cost story. Teams Phone Standard lists at $8 per user per month, but only as an add-on to a qualifying Microsoft 365 licence, so the effective cost depends on what the estate already pays Microsoft. Teams Phone with Calling Plan, where the PSTN is included, lists at $15 per user per month. The gap between those two numbers is the price of the phone line, and it is the line a finance partner will ask about.

Zoom and RingCentral sell the other way round. Zoom Phone Pro lists at $15 per user per month metered or $20 unlimited US and Canada, with international calling and contact-centre add-ons separate. RingCentral Core lists at $20 per user per month, with Advanced and Ultra rising to $25 to $35 for contact-centre features. In both, the seat is the phone line; there is no second contract to reach the PSTN.

What 1,000 seats does to the monthly number

Run the published rates across 1,000 users and the spread is wide enough to matter in a budget line. Teams Phone Standard is $8,000 a month before a single PSTN call is connected. Teams Phone with Calling Plan is $15,000. Zoom Phone Pro is $15,000 metered or $20,000 unlimited. RingCentral Core is $20,000, and a move to its Advanced or Ultra tiers puts the same estate at $25,000 to $35,000.

The Teams figure is the one that misleads, because the $8,000 is not a phone bill. It is an add-on sitting on top of Microsoft 365 licences the organisation already owns, and the PSTN connection is a further purchase from a calling plan or an operator. Microsoft supports more than one PSTN integration on a tenant and any combination of solutions, so the connection can be split across sites and operators, but each route carries its own commercial terms that Microsoft does not publish as a single rate.

That missing number is a finding, not a gap. Neither Microsoft's Teams Phone documentation nor its enablement pages state a per-user price for the PSTN side, because it depends on the operator and the country. Ask the account team or the operator for the per-user monthly cost of the calling plan or Operator Connect route at 1,000 seats, the per-minute rate outside the included geography, and the emergency-calling terms, then add it to the $8,000 before comparing anything.

The other published number cuts the other way. Real-world deal pricing for 50 or more seats typically lands 15 to 30 percent below list at all three providers, so the published rate is a starting point rather than a final figure. At 1,000 seats that discount is worth $1,200 to $6,000 a month depending on the option, which is more than the difference between several of the list prices.

Where the bundle stops covering the estate

The Teams bundle stops at the edge of the Microsoft estate. Teams Phone works in all desktop and mobile Teams clients and on certified third-party hardware, and it supports coexistence with another phone system or a contact centre. What the $8 licence does not include is the PSTN connection, and what the documentation does not describe is a contact-centre product of the depth RingCentral sells. A 1,000-seat organisation with a queue-based support line is buying a phone system and a contact centre, and only one of these three prices both in the same seat.

RingCentral's answer to that is explicit. Its Advanced and Ultra packages carry cost-centre management, multi-support administration, custom roles and permissions, adoption analytics and Business Analytics Essentials, which is the set an organisation consolidating an on-premise PBX across multiple sites and regions is told to buy. That is why the per-seat price climbs to $25 to $35. The buyer paying $20 for Core and expecting the consolidation features has misread the tier.

Zoom's bundle stops at the geography. Pro at $15 is metered and $20 is unlimited US and Canada, with international calling and contact-centre add-ons separate. For a 1,000-seat estate with UK, German and Singapore offices, the unlimited US and Canada rate is not the rate that applies to most of the dialling, and the international plan is a quote.

Compliance recording is the third place a bundle ends. A regulated estate that must record calls may find the recording capability sits in a second subscription rather than the seat it already bought, which changes the per-user maths for the whole estate rather than the handful of users who need it.

The integration is the product, and it is priced that way

Microsoft's case is not a cheaper seat. It is that Teams Phone replaces an existing PBX with features delivered from the same platform that provides the productivity tools, administered through the same model as native Teams calling, with voice policy set globally, by group or per user. For an estate already standardised on Microsoft 365, that removes an admin surface and a vendor relationship rather than a line from the invoice.

RingCentral attacks the same ground from outside. It sells business calling to Microsoft Teams customers specifically, positioning itself as the phone system for Teams with pre-built integrations into Salesforce, HubSpot, Zendesk and ServiceNow, and publishes a 99.999 percent reliability figure. That is a real option for an organisation that wants Teams for collaboration and a dedicated vendor for voice, and it is priced at $20 a seat rather than $8 plus an operator contract.

Zoom's case is the client. Voice rides the same infrastructure as meetings, with one client and one admin surface for both, which is worth most to an organisation whose meetings already run on Zoom and least to one that does not. The published rate does not by itself settle which of these three is cheaper at 1,000 seats, because two of them hide a component in a quote and the third hides a tier behind a feature list.

Who should walk away

Walk away from Teams Phone if the estate is not already on a qualifying Microsoft 365 licence. The $8 add-on is only $8 on top of a subscription the organisation is paying for anyway; priced as a standalone phone system it is a licence plus a PSTN contract plus the migration, and the case collapses.

Walk away from RingCentral Core if the requirement is a contact centre across multiple sites. Core at $20 does not carry the cost-centre management, custom roles and analytics that the consolidation case depends on, and the estate that needs them is buying Advanced or Ultra at $25 to $35, which is $5,000 to $15,000 a month more than the Core number it budgeted.

Walk away from Zoom Phone Pro if most of the 1,000 users dial internationally. The $20 unlimited rate covers US and Canada, and the international plan is a separate quote, so the published price is the price for the smallest part of a global estate's traffic.

Choose Teams Phone with Calling Plan at $15 if the estate is on Microsoft 365, the calling is mostly domestic, and removing a vendor is worth more than the last few dollars a seat. Choose RingCentral at $20 to $35 if a contact centre and multi-site administration are in scope and a single vendor for real-time communications is the requirement. Choose Zoom at $15 to $20 if meetings already run on Zoom and the phone system should disappear into the same client. In every case, get the PSTN or international line in writing before signing, because that is the number none of the three publishes.