Glossary · Hosted PBX

What is hosted PBX?

Hosted PBX is a cloud-based business phone system where the provider hosts and manages all the PBX infrastructure on their servers. Customers access phone features via software apps and IP-connected devices, paying a per-user monthly subscription instead of buying and maintaining on-premises PBX hardware. Hosted PBX is sometimes called cloud PBX, virtual PBX, or PBX-as-a-Service. Most modern hosted PBX products are part of broader UCaaS platforms that add video meetings, team chat, and business SMS to the phone core.

Hosted PBX vs. traditional on-premises PBX

The core difference: where the system lives and who operates it.

Aspect	On-Premises PBX	Hosted PBX
Location	Customer’s office/data center	Provider’s cloud
Hardware	Customer buys and maintains	Provider owns
Upfront cost	$10K–$500K+	Zero
Ongoing cost	Carrier lines + maintenance	Per-user subscription
Setup time	Weeks to months	Minutes
IT skills required	Phone system expertise	Basic admin only
Upgrades	Major projects every 3–7 years	Continuous, automatic
Scaling	Hardware changes required	Add/remove users in admin portal
Remote work	Limited without VPN/tromboning	Native from any device
AI features	Rare or absent	Standard in modern platforms
Disaster recovery	Customer’s problem	Provider’s geographic redundancy

What’s included in hosted PBX

Standard features:

Unlimited inbound/outbound calling (domestic typically unlimited; international metered or included)
Extensions per user
Auto attendant and IVR menus
Voicemail with email/SMS delivery and often transcription
Call transfer, hold, park, pickup, waiting
Ring groups, hunt groups, queues
Call recording (subject to compliance rules)
Mobile apps (iOS, Android) and desktop softphones
Administrative portal for user management
Basic analytics and call reporting

Advanced features (varies by provider):

HD video meetings included
Business SMS and team chat
Online fax (HIPAA-compliant in regulated industries)
Real-time AI transcription with sentiment
AI SMS drafting
24/7 AI receptionist
CRM integrations (Salesforce, HubSpot, Zendesk)
Microsoft Teams integration
Contact center (CCaaS) add-on
Open API for custom workflows

Hosted PBX deployment models

Public cloud (multi-tenant): most common. Provider operates shared infrastructure for all customers with logical tenant isolation. Suits 90%+ of businesses.

Private cloud (single-tenant): dedicated infrastructure per customer. Used when data-residency, regulatory, or contractual requirements mandate isolation.

Hybrid: mix of cloud and on-premises components, often during migration from legacy PBX.

DialPhone is a public-cloud hosted PBX with multi-region data residency for customers that need regional pinning (US, EU, UK, AU, JP) without full private-cloud complexity. See how it compares in the best AI business phone systems ranking.

Who uses hosted PBX

Small businesses replacing legacy phone lines with a modern, mobile-ready system
Mid-market consolidating multiple communications vendors
Enterprises standardizing communications across regions and subsidiaries
Remote/hybrid teams needing a consistent phone experience across locations
Startups wanting a business phone system without capital expense
Regulated industries using hosted PBX with HIPAA BAAs or FINRA-compliant retention

Typical hosted PBX pricing

Entry tier: $10–$25/user/mo. Basic calling, mobile apps, basic voicemail.
Mid tier: $25–$45/user/mo. Adds CRM integration, business SMS, video meetings.
Top tier: $45–$80/user/mo. Adds advanced analytics, priority support, API access, enterprise security.
Enterprise: custom pricing for large deployments with custom contracts.

DialPhone hosted PBX: Core $24, Advanced $34, Ultra $54 per user per month, billed annually. See pricing →

What to look for in a hosted PBX provider

Reliability: 99.999% uptime SLA or better
Call quality: HD codecs, global edge network, jitter handling
Security and compliance: SOC 2, HIPAA BAA, GDPR, encryption at rest and in transit
Integrations: native connections to your CRM and helpdesk
AI capabilities: transcription, summaries, virtual agents
Mobile experience: native iOS/Android apps, not just web
Porting: free number porting, no interruption
Support: 24/7 access, dedicated CSM at higher tiers
Transparent pricing: published rates at every tier, not quote-only
Migration support: help moving from your current system

Example

A 60-person architecture firm had a 9-year-old on-premises PBX approaching end-of-life. The quoted replacement: $45,000 in new PBX hardware plus $8,000/year in maintenance. They moved to DialPhone Advanced at $34/user = $2,040/month. ROI: recovered the “saved” capital expense in approximately 18 months, and gained mobile apps, AI transcription, and HIPAA-compliant communications for their healthcare project work, capabilities the on-premises system couldn’t deliver.

See DialPhone’s hosted PBX

AI business phone system → · Compare hosted PBX providers → · See pricing →

Top hosted PBX providers in 2026

The hosted PBX market is crowded. Headline pricing looks similar, but per-seat feature set, AI depth, and contract terms vary widely. A candid ranked shortlist of seven vendors that consistently appear in 2026 B2B evaluations:

DialPhone — $24–$54/seat/mo billed annually. AI-first hosted PBX with business phone, SMS, video meetings, and a 24/7 AI receptionist included on every tier. Free number porting, no setup fees, transparent pricing published at every tier. Strongest fit for SMB and mid-market teams that want AI features without paying for an add-on.
RingCentral RingEX — $20–$35/seat/mo. The market-share leader with the deepest partner ecosystem (Salesforce, ServiceNow, MS Teams). RingSense AI is sold as a separate $20–$40/seat add-on rather than bundled. Strongest fit for enterprises with mature integration requirements and existing channel relationships.
Nextiva — $18.95–$32.95/seat/mo. Cleanest SMB admin experience in the category and consistently top-rated for customer support. Lighter on AI than DialPhone or RingCentral. Strongest fit for SMBs that value usability and human support over advanced AI.
8x8 X Series — $24–$85/seat/mo. International calling included to 14–48 countries depending on tier — by far the broadest unlimited-international coverage. Strongest fit for multinational teams with offices or staff outside the US/Canada.
Vonage Business Communications — $19.99–$39.99/seat/mo. Solid generalist with a usable mobile app and a reasonable API platform (Vonage Communications APIs). Strongest fit for teams that need both a UCaaS product and programmable voice/SMS in one vendor.
Ooma Office — $19.95–$29.95/seat/mo. Hardware-friendly, ships pre-configured IP phones, and supports analog devices like fax machines and door buzzers through their Linx adapter. Strongest fit for ultra-SMB and small offices with existing hardware to preserve.
Grasshopper — $26–$80/month flat (not per-seat). Strictly speaking Grasshopper is virtual-number forwarding rather than a true hosted PBX (no extensions, no real SIP endpoints), but it ranks for hosted PBX queries and serves solopreneurs adequately. Strongest fit for sole proprietors and side-businesses that want a business number on a personal phone.

Honest tradeoffs: RingCentral has the deepest integrations but charges extra for AI. Nextiva has the cleanest SMB UX but lighter AI. 8x8 wins international. Ooma owns the hardware-heavy small office. Grasshopper isn’t really hosted PBX. DialPhone wins on bundled AI per dollar.

Hosted PBX vs cloud PBX vs hosted VoIP

These terms get used interchangeably in 2026, but there are subtle distinctions worth knowing before comparing vendors.

Hosted PBX — the vendor runs the PBX in their cloud. Legacy term from the late 2000s when “PBX in the cloud” was new and needed a name to distinguish it from on-premises PBX. Implies traditional PBX features (extensions, hunt groups, IVR, call routing) delivered as a service.
Cloud PBX — the same thing in modern phrasing. If you see “cloud PBX” in 2026 marketing, assume it means hosted PBX. Microsoft Teams Phone uses this term for its own service, which has subtly shifted what buyers expect from the phrase.
Hosted VoIP — a broader umbrella. Any VoIP service the vendor hosts, with or without traditional PBX features. A hosted VoIP service might be a SIP trunking offering with no extensions, or it might be a full hosted PBX. Read the feature list, not the label.
UCaaS — hosted PBX plus team chat, video meetings, and business SMS as a unified suite. UCaaS is what most hosted PBX vendors actually sell in 2026 even when they market under the “hosted PBX” label.

Practical conclusion: when you buy a “hosted PBX” in 2026, you’re almost always buying UCaaS. Vendors ranking for hosted PBX terms (RingCentral, Nextiva, 8x8, DialPhone) all sell unified suites. The label is legacy SEO; the product is UCaaS. The exception is purpose-built SIP trunking, which connects to your own PBX rather than replacing it.

Hosted PBX pricing: what the headline number leaves out

Headline per-seat prices ($18–$30/seat/mo) are misleading without the full bill. Line items that get added back in:

Setup or onboarding fees — $0 to $500 one-time. DialPhone and Nextiva charge $0; some enterprise contracts add professional services fees.
Number porting — $25 to $200 per number depending on vendor and number type. DialPhone is free; RingCentral is free on most plans; some smaller vendors still charge.
Additional numbers beyond the included one — $1 to $5 per number per month.
International outbound minutes — billed per-minute outside US/Canada unless your tier includes unlimited international (rare below $30/seat). Rates vary from $0.01/min (UK landline) to $1+/min (some satellite destinations).
Toll-free numbers — $1 to $15 each per month plus $0.02 to $0.05 per inbound minute (toll-free is paid by the recipient).
AI features — bundled on DialPhone; sold as a $20–$50/seat add-on at RingCentral (RingSense), Dialpad Ai (included on most tiers), and some other vendors.
Recording storage caps — typically 90 days included, then per-GB charges or a paid retention upgrade.
SMS messages beyond the bundle — $0.01 to $0.05 per message after the included allotment.
Premium support and SLA upgrades — $5 to $15/seat for 24/7 priority support, dedicated CSM, or stricter uptime SLA.

Real per-seat cost typically lands 20–40% higher than the headline. Build the full 24-month TCO when comparing. DialPhone pricing publishes the full feature list at every tier with no quote-only enterprise gating below 500 seats.

Hosted PBX migration: 6-step plan from on-premises or legacy provider

Migration discipline matters more than vendor choice. A clean cutover follows six stages.

Audit current usage. Pull six months of call detail records from your current system. Calculate peak concurrent calls (drives any per-channel pricing), monthly inbound/outbound minute volumes, integration touchpoints (CRM, helpdesk, ERP), and a full hardware inventory (handsets, headsets, ATAs, fax machines, paging systems, door entry).
Map extension scheme and call flows on paper. Do not rebuild blindly in the new admin portal. Document every extension, hunt group, IVR menu, after-hours route, and conditional rule from the legacy system. Decide which to carry over, which to consolidate, and which to retire. Most migrations cut 20–30% of legacy routing rules that no one remembers configuring.
Plan number porting. Timeline is 2–15 business days depending on quantity, current carrier, and number type. Toll-free numbers port faster than local DIDs. Submit a Letter of Authorization (LOA) and a recent bill from the losing carrier. Keep the old service active until porting completes — never cancel before the port date. See the number porting guide for a full checklist.
Decide handset strategy. Three paths: keep existing SIP phones (most Polycom, Yealink, and Cisco IP phones are supported by major cloud providers — confirm model compatibility before assuming), buy new handsets pre-provisioned by the new vendor, or go all-softphone with mobile and desktop apps. Hybrid (softphone for most staff, IP phones for receptionists and call-center seats) is common.
Pilot with 1–2 departments before full cutover. Pick a low-risk team (internal IT, a single small office) and run for 7–14 days. Validate call quality, voicemail flow, integrations, and admin portal usability. Surface configuration gaps before the all-hands cutover.
Decommission legacy hardware after a 30-day verification window. Keep the old PBX powered on but routed-around for 30 days post-cutover. Confirms nothing fell through the cracks (third-party integrations, an obscure analog line for a fire panel, etc.) before you rack-and-stack it.

Typical end-to-end migration window: 4–8 weeks for under 100 seats, 8–16 weeks for mid-market. Anything claiming “migrate in a day” is glossing over steps 1, 2, and 5.

When hosted PBX makes sense (and when it doesn’t)

Hosted PBX is the default architecture for new business deployments in 2026, but not universally the right choice.

Hosted PBX fits when:

You have no existing on-premises PBX, or your existing system is approaching end-of-life with no remaining sunk capex worth preserving.
Your team is distributed, hybrid, or mobile-heavy and needs a consistent calling experience across locations and devices.
You want predictable per-seat operating expense rather than capex cycles every 3–7 years.
You need to deploy under 30 days. Hosted PBX cutovers run weeks; legacy PBX projects run 6–18 months.
You want AI features (transcription, summaries, virtual receptionists) without standing up your own infrastructure.
You’re regulated (HIPAA, FINRA, GDPR) and want the vendor to carry the compliance burden via BAA, SOC 2, and signed DPAs.

Hosted PBX is the wrong fit when:

You have 200+ seats and a recently-deployed IP PBX with significant sunk capex that can’t be redeployed elsewhere — SIP trunking to your existing PBX is dramatically cheaper at scale than re-licensing every seat.
You operate in extreme security environments — air-gapped facilities, certain government and defense contexts, or jurisdictions that prohibit cloud-hosted voice data.
Your network conditions don’t reliably support VoIP. This is now rare (under 1% of business locations in the US/EU/UK/AU), but still relevant for some rural or developing-market sites without adequate broadband.
You have specialized analog-heavy workflows (large fax estates, paging systems, alarm panels) that survive better on hybrid deployments than pure cloud.

For everyone else — the majority of new deployments — hosted PBX is the right architecture. The question is which vendor, not whether to host.

Hosted PBX frequently asked questions

How much does a hosted PBX cost in 2026?

Entry tiers start at $18–$25/seat/mo for basic calling and voicemail. Mid tiers run $25–$45/seat/mo and add CRM integration, SMS, and video. Top tiers reach $45–$80/seat/mo with advanced analytics, API access, and bundled AI. The headline number understates real cost by 20–40% once you include porting, international minutes, AI add-ons, and recording storage. DialPhone publishes flat $24/$34/$54 tiers with AI, porting, and recording included.

What’s the difference between hosted PBX and on-premises PBX?

On-premises PBX runs on hardware you own and operate, with upfront capex of $10K–$500K+ and ongoing maintenance. Hosted PBX runs in the vendor’s cloud, paid as a per-seat subscription with no upfront hardware cost. On-premises needs phone-system expertise; hosted PBX needs only basic admin skills. Hosted PBX scales by clicking in the admin portal; on-premises requires hardware changes. The table earlier on this page details every dimension.

Can I keep my existing desk phones with a hosted PBX?

Most cloud providers support common SIP-based IP phones from Polycom, Yealink, Cisco, and Grandstream — check your specific model against the new vendor’s compatibility list before assuming. Phones bought in the last 5–7 years generally work. Older proprietary phones (Avaya, Nortel, Mitel digital sets) typically do not — they’re tied to the old PBX. Analog devices (fax machines, alarm panels) can connect through an Analog Telephone Adapter (ATA). Many teams use migration as a chance to standardize on softphones with optional new IP phones for receptionists.

How long does hosted PBX setup take?

The system itself activates in minutes — you create the account, add users, configure routing, and place test calls the same day. The longer timeline is number porting (2–15 business days from your current carrier) and the migration discipline around extensions, call flows, integrations, and pilot testing. For a clean cutover including porting and a verification window, plan 4–8 weeks for under 100 seats and 8–16 weeks for mid-market. Any vendor claiming “migrate in a day” is selling the activation step and skipping the porting and verification work.

Is hosted PBX secure for sensitive business calls?

Yes, when implemented correctly. Look for SOC 2 Type II certification, end-to-end encryption (SRTP for voice, TLS for signaling), HIPAA BAA availability if you’re in healthcare, GDPR-compliant data residency if you have EU users, and signed DPAs. Hosted PBX is typically more secure than on-premises PBX because the provider runs continuous patching, intrusion monitoring, and DDoS protection that most businesses can’t replicate in-house. Air-gapped facilities and certain government/defense contexts are the exceptions where cloud hosting isn’t permitted.

Do I need internet redundancy for a hosted PBX?

Strongly recommended for any business where phone downtime equals revenue loss. The minimum sensible setup: a primary business broadband connection (cable or fiber) plus a secondary path for failover. Common second-path options are a separate fiber from a different carrier, fixed wireless, or 4G/5G cellular backup. Many hosted PBX vendors also offer automatic call forwarding to mobile numbers if the office internet goes down — calls reach staff on cell phones during the outage. For single-location SMBs with under 20 seats, cellular failover plus mobile-app calling is usually sufficient.

Hosted PBX vs. cloud phone: what’s the difference
How to switch from a landline to VoIP
PBX — the on-premises predecessor
UCaaS — hosted PBX with meetings, chat, and SMS bundled
VoIP — the protocol underlying hosted PBX
DialPhone pricing