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VitalPBX vs 3CX: Multi-Tenant PBX Features Compared (2026)

If you’re an MSP, ITSP, or reseller deciding between VitalPBX and 3CX for hosting multiple customers on shared infrastructure, the “multi-tenant” label on both vendors’ sites hides some real differences in licensing, tenant limits, and what each tenant actually gets. This article compares VitalPBX Multi-Tenant and 3CX Multi-Tenant side by side, using only publicly documented facts from both vendors, so you can see which architecture fits your customer base before you commit a license.

How Multi-Tenant Works on Each Platform

Multi-tenant PBX means one server hosts multiple independent phone systems for different client companies, instead of standing up a dedicated server per client. Both VitalPBX and 3CX offer this, but they built it for different customer profiles.

VitalPBX offers multi-tenancy as a dedicated Multi-Tenant plan, self-hosted on a Debian 12 64-bit server (on-premise or any VPS/cloud provider — AWS, DigitalOcean, Vultr, etc.). It supports up to 5,000 extensions total on a license, with no per-user or per-extension fee — the cost is the same whether you’re running 10 extensions or 5,000 [VitalPBX Plans & Pricing]. Multi-tenant capability is also bundled into the lower-cost VitalPBX One plan.

3CX added a dedicated Multi-Tenant capability in late 2024, allowing partners to host multiple companies — each isolated as a separate “department” — on a single 3CX instance instead of a dedicated server per client [3CX Multi-Tenant PBX]. 3CX positions this specifically for smaller accounts: its own FAQ states multi-tenant is “ideal for smaller SOHO/SMB style businesses with up to 10 users and basic to moderate communications requirements” per tenant [3CX Multi-Tenant PBX].

Licensing & Capacity

This is where the two platforms diverge most.

VitalPBX Multi-Tenant is priced as a flat plan: $250/month, $2,500/year, or a $10,000 one-time license, covering up to 5,000 extensions with no per-user surcharge [VitalPBX Plans & Pricing]. VitalPBX doesn’t publish a fixed maximum number of tenants — but a practical ceiling of roughly 100 tenants per server applies due to a limitation in the underlying Asterisk engine, regardless of how many extensions your license allows.

3CX Multi-Tenant uses 3CX’s standard Simultaneous Call (SC) licensing, with one important detail: SC capacity is pooled across every tenant on the instance, not allocated per tenant. 3CX’s own documentation confirms there’s no way to cap how many simultaneous calls one tenant consumes — you size the whole subscription for total anticipated usage across all tenants combined, and upgrade the license key as that usage grows [3CX Multi-Tenant PBX]. The minimum license size to enable multi-tenant is 16SC Basic [3CX Multi-Tenant PBX]. A single license key covers every tenant on the instance, and the hosting partner — not the individual tenant companies — is the registered 3CX customer of record, taking on all responsibility for customer communication [3CX Multi-Tenant: Making Your SMB Customers Profitable Again].

3CX doesn’t publish a fixed cap on tenant count either — it depends on your extension numbering plan (a 3-digit plan holds fewer tenants than a 5-digit plan) and your server hardware [3CX Multi-Tenant PBX]. Third-party pricing guides report 3CX’s PRO edition starting around €395–795/year at the low end and scaling into the tens of thousands for high-capacity Enterprise/AI editions, though exact current rates should be confirmed on 3CX’s own pricing calculator since they change with regional promotions [3CX pricing overview via CloudTalk, current as of this article’s research date].

What Each Tenant Actually Gets

A few feature-scope details matter for anyone evaluating this at the tenant level, not just the license level:

  • CRM integration: VitalPBX offers native CRM integrations with Zoho CRM, Odoo, and Salesforce. On 3CX, CRM integration is documented as a dedicated-instance-only feature — a separate CRM per customer is explicitly not available in 3CX’s multi-tenant mode [3CX Multi-Tenant PBX].
  • Department structure: Each 3CX tenant is limited to a single department; if a client needs multiple departments, 3CX’s own guidance is to move that client to a dedicated instance instead [3CX Multi-Tenant PBX].
  • Domain: All tenants on a 3CX multi-tenant instance share the hosting partner’s single FQDN — there’s no per-tenant custom domain. 3CX again recommends a dedicated instance for any client that wants its own domain [3CX Multi-Tenant PBX].
  • Reporting: 3CX does provide per-tenant call reporting even in multi-tenant mode [3CX Multi-Tenant PBX]. VitalPBX’s Sonata Stats and Sonata Billing add-ons cover call center reporting and tenant billing/cost management for partners running its Multi-Tenant plan.
  • Setup: Both platforms support manual tenant creation through the admin interface and programmatic creation via API — 3CX through its XAPI configuration REST API [3CX Multi-Tenant PBX].

Which Fits Your Business Better

If you’re an MSP or ITSP serving mostly small accounts — think SOHO clients under 10 users each — 3CX’s multi-tenant tier is built explicitly around that profile, and 3CX states it directly in its own FAQ. If your book of business includes larger tenants, or you want to avoid recalculating simultaneous-call capacity every time a client’s usage grows, VitalPBX’s flat, extension-based Multi-Tenant plan (up to 5,000 extensions, no per-user fee) removes that variable from your pricing math. [Link: VitalPBX Plans & Pricing — vitalpbx.com/pbx-plans-and-pricing-vitalpbx-system/]

Frequently Asked Questions

What does “multi-tenant” mean in a PBX system?

Multi-tenant means one server hosts multiple independent, isolated phone systems for separate client companies, instead of requiring a dedicated server per client. Both VitalPBX and 3CX offer this, letting MSPs and resellers consolidate hosting and management under one platform while keeping each client’s data and call routing separate.

How is VitalPBX Multi-Tenant licensed?

VitalPBX’s Multi-Tenant plan is a flat license — $250/month, $2,500/year, or a $10,000 one-time purchase — covering up to 5,000 extensions with no per-user or per-extension fee. The same license cost applies whether you’re running 10 extensions or 5,000.

How is 3CX Multi-Tenant licensed?

3CX Multi-Tenant uses 3CX’s standard Simultaneous Call (SC) licensing, starting at a minimum of 16SC Basic. Simultaneous call capacity is shared across all tenants on the instance rather than allocated per tenant, so the license must be sized for total usage across every hosted company combined.

Can each tenant have its own CRM integration on 3CX?

No. 3CX’s own documentation states that a separate CRM integration per customer is not available in multi-tenant mode — CRM integration on 3CX requires a dedicated, single-tenant instance.

Is there a hard limit on how many tenants VitalPBX or 3CX can host per server?

Neither vendor publishes a single fixed number. VitalPBX has a practical ceiling of roughly 100 tenants per server due to the underlying Asterisk engine. 3CX’s tenant capacity depends on your extension numbering plan length and server hardware, with no published fixed maximum.

Which is better for an MSP serving a mix of small and larger clients?

It depends on client size. 3CX explicitly positions its multi-tenant tier for SOHO/SMB clients with up to 10 users each. VitalPBX’s Multi-Tenant plan supports up to 5,000 extensions total with no per-user fee, which can simplify pricing for MSPs managing a wider range of client sizes.

VitalPBX’s Multi-Tenant plan comes with a 30-day free trial (credit card required, no charge if cancelled before the trial ends), or you can book a demo to see it configured for your customer base.

Sources & Methodology

Researched and fact-checked on July 23, 2026, from the following official and third-party sources:

Comparison based on publicly available information from 3CX and VitalPBX as of July 23, 2026. Features, pricing, and specifications are subject to change; readers should verify current details on each vendor’s official website. 3CX® is a registered trademark of 3CX Ltd. VitalPBX is a trademark of VitalPBX LLC. This content is independently produced and is not sponsored, endorsed by, or affiliated with 3CX Ltd.

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