As of June 2025, the United States counted 63 million interconnected VoIP subscriptions against just 15 million legacy switched access lines - a more than four-to-one ratio that inverts the telephone market of a decade ago (FCC, Voice Telephone Services, June 2025). Globally, the UCaaS market stands at $70.56 billion in 2026 and is on track for $221.14 billion by 2031 (Mordor Intelligence). Microsoft Teams Phone crossed 26 million PSTN users and Zoom Phone passed 10 million seats during 2025, while roughly 76% of US adults now live in homes with no landline (Microsoft; Zoom; CDC/NCHS). This analysis consolidates data from the FCC, Gartner, Mordor Intelligence, Fortune Business Insights, and 18 other primary sources to map where business cloud telephony actually stands in 2026.
TL;DR
- The global VoIP market is projected to grow from about $144.77 billion in 2024 to $326.27 billion by 2032 at a 10.8% CAGR (Fortune Business Insights, VoIP Market Report 2025).
- The UCaaS market sits at $70.56 billion in 2026 and is forecast to reach $221.14 billion by 2031, a 25.67% CAGR (Mordor Intelligence, UCaaS Market 2026).
- Microsoft Teams Phone reached 26 million PSTN users by end-2025, up from 20 million in April 2024 (Microsoft, via Pure-IP, 2025).
- Zoom Phone surpassed 10 million seats in October 2025, six years after its 2019 launch (Zoom, Zoom Phone Milestone, 2025).
- The US had 63 million interconnected VoIP subscriptions versus 15 million switched access lines as of June 2025 (FCC, Voice Telephone Services, 2025).
- Switched access lines are falling at a 17.9% CAGR while VoIP declines just 2.3% and mobile grows 2.5% (FCC, Voice Telephone Services, 2025).
- Roughly 76% of US adults live in wireless-only homes with no landline (CDC/NCHS, Wireless Substitution, most recent 2023).
- By 2028, Gartner expects 90% of organizations to rely on cloud office platforms for enterprise telephony, up from 30% in 2025 (Gartner, Magic Quadrant for UCaaS 2025).
- Businesses migrating from landlines to VoIP report 30% to 50% savings on communication costs (Nextiva, VoIP Statistics 2026).
- Global telecom fraud is estimated near $38 to $40 billion a year, with toll fraud and IRSF among the biggest categories (CFCA, Global Fraud Loss Survey).
- The CPaaS market is worth $21.27 billion in 2026, growing to $41.05 billion by 2031 at a 14.05% CAGR (Mordor Intelligence, CPaaS Market 2026).
- RingCentral posted $2.5 billion in FY2025 revenue, with AI-monetized ARR now near 10% of total (RingCentral, Q4 and FY2025 Results).
1. VoIP and UCaaS Market Size
Market-size estimates diverge widely because research firms define the category differently - some count only enterprise cloud telephony, others fold in consumer calling apps and carrier wholesale. Fortune Business Insights values the global VoIP market at roughly $144.77 billion in 2024 and projects $326.27 billion by 2032 at a 10.8% CAGR, while narrower UCaaS-only definitions from Mordor Intelligence land at $70.56 billion for 2026 (Fortune Business Insights, 2025; Mordor Intelligence, 2026). The directional story is consistent across every firm: double-digit compound growth driven by cloud migration, even as the absolute figures span an order of magnitude. Cross-referencing Mordor, Grand View Research, and Custom Market Insights gives a defensible 2026 UCaaS range of roughly $70 billion to $129 billion.
| Metric | Value | Source |
|---|---|---|
| Global VoIP market (2024) | $144.77B | Fortune Business Insights, 2025 |
| Global VoIP market (2032 forecast) | $326.27B | Fortune Business Insights, 2025 |
| VoIP market CAGR (2024-2032) | 10.8% | Fortune Business Insights, 2025 |
| UCaaS market (2026) | $70.56B | Mordor Intelligence, 2026 |
| UCaaS market (2031 forecast) | $221.14B | Mordor Intelligence, 2026 |
| UCaaS market CAGR (2026-2031) | 25.67% | Mordor Intelligence, 2026 |
| UCaaS market (2026, broad estimate) | $128.91B | Grand View Research, 2026 |
| UCaaS users worldwide (2028 forecast) | 131M+ | Cavell, 2024 |
Outlier note: Custom Market Insights projects the UCaaS market at $605.5 billion by 2035 at a 20.4% CAGR - the most aggressive long-range estimate in this set (Custom Market Insights, 2026).
Sources: Mordor Intelligence - UCaaS Market, Fortune Business Insights - VoIP Market. This telephony layer sits inside the broader subscription-software economy tracked in our SaaS statistics roundup.
2. Vendor and Platform Landscape
The seat race among cloud phone platforms tightened sharply in 2025. Microsoft Teams Phone reached 26 million PSTN users by the end of 2025 - up from 20 million in April 2024, a roughly 30% jump in under two years (Microsoft, via Pure-IP, 2025). Zoom Phone crossed 10 million seats in October 2025, and Cisco Webex Calling reports 13 to 15 million users, meaning three vendors now anchor the enterprise voice market alongside RingCentral, the long-standing revenue leader. Gartner’s 2025 Magic Quadrant for UCaaS evaluated 11 providers and named Cisco, Microsoft, RingCentral, and Zoom as Leaders, with 8x8, Dialpad, and GoTo as Visionaries.
| Metric | Value | Source |
|---|---|---|
| Teams Phone PSTN users (end 2025) | 26M | Microsoft / Pure-IP, 2025 |
| Teams Phone PSTN users (April 2024) | 20M | Microsoft, 2024 |
| Zoom Phone seats (Oct 2025) | 10M | Zoom, 2025 |
| Cisco Webex Calling users (2025) | 13-15M | Pure-IP, 2025 |
| RingCentral FY2025 revenue | $2.5B (+5% YoY) | RingCentral, 2026 |
| RingCentral annualized exit ARR (Q3 2025) | $2.63B | RingCentral, 2025 |
| 8x8 FY2025 service revenue | $693M | 8x8, 2025 |
| Gartner 2025 UCaaS MQ Leaders | Cisco, Microsoft, RingCentral, Zoom | Gartner, 2025 |
This roundup covers cloud telephony; for meeting platforms like Zoom Meetings and Teams video, see our separate video conferencing statistics for 2026.
Sources: Zoom - Zoom Phone Hits 10 Million Seats, Gartner - Magic Quadrant for UCaaS 2025, RingCentral - Q4 and FY2025 Results
3. The PSTN Switch-Off and Landline Decline
The copper phone network is being decommissioned on both sides of the Atlantic, and the FCC’s data quantifies how far the shift has already gone. In the US, interconnected VoIP subscriptions outnumbered legacy switched access lines 63 million to 15 million as of June 2025, with access lines shrinking at a 17.9% compound annual rate (FCC, Voice Telephone Services, June 2025). Business buyers led the migration: 78% of non-ILEC business wireline connections were VoIP by mid-2024. In the UK, Openreach is targeting a January 2027 PSTN retirement, with roughly 2.8 million lines still to migrate. Gartner projects that 90% of organizations will run enterprise telephony on cloud office platforms by 2028, up from just 30% in 2025.
| Metric | Value | Source |
|---|---|---|
| US interconnected VoIP subscriptions (June 2025) | 63M | FCC, 2025 |
| US switched access lines (June 2025) | 15M | FCC, 2025 |
| US mobile voice subscriptions (June 2025) | 395M | FCC, 2025 |
| Switched access line decline (3-yr CAGR) | -17.9% | FCC, 2025 |
| Business wireline connections that are VoIP (June 2024) | 78% (non-ILEC) | FCC, 2024 |
| US adults in wireless-only homes | ~76% | CDC/NCHS, 2023 |
| UK lines still on PSTN before switch-off | ~2.8M | Openreach/Ofcom, 2025 |
| Orgs on cloud office telephony by 2028 | 90% (from 30% in 2025) | Gartner, 2025 |
Context note: the ~76% wireless-only figure is the most recent confirmed CDC/NCHS estimate (July-December 2023); the agency’s July-December 2024 release continues the upward trend.
Sources: FCC - Voice Telephone Services Report, Openreach - PSTN Switch-Off
4. Adoption, Cost Savings, and Remote Work
Cost is still the headline reason businesses move to VoIP, but hybrid work has become the accelerant. Companies migrating from legacy landlines report 30% to 50% savings on communication costs, and organizations moving voice into Microsoft Teams report 50% to 78% drops in telecom spending (Nextiva, 2026; Pure-IP, 2025). Nearly 80% of enterprises now use VoIP in some form, and 82% report significant savings after cloud migration. Remote and hybrid patterns compound the case: 43% of companies name VoIP as a key enabler of remote communication, and UCaaS platforms save employees an estimated 30 minutes per day by consolidating messaging, voice, and video into one workflow.
| Metric | Value | Source |
|---|---|---|
| Enterprises using VoIP (2025) | ~80% | Nextiva, 2025 |
| Cost savings migrating landline to VoIP | 30-50% | Nextiva, 2025 |
| Small-business savings on usage-based plans | Up to 68% | Nextiva, 2025 |
| Orgs reporting significant savings post cloud migration | 82% | Microsoft (via Nextiva), 2025 |
| Companies citing VoIP as key remote-work enabler | 43% | Nextiva, 2025 |
| Workplaces implementing a hybrid model | 64% | Zoom, 2025 |
| Employees choosing VoIP over POTS | 36% vs 24% | Software Advice (via Nextiva), 2025 |
| Time saved per employee/day with UCaaS | 30 min | Frost & Sullivan (via Nextiva), 2025 |
For the workforce trends behind these adoption numbers, see our remote work statistics for 2026.
Sources: Nextiva - VoIP Statistics 2026, Pure-IP - Teams Phone Reaches 26 Million Users
5. Cloud PBX, SIP Trunking, and Mobile VoIP
Beneath the branded platforms sit the infrastructure sub-markets that actually carry the calls, and each is growing at its own pace. The hosted PBX market is projected to rise from $16.93 billion in 2026 to $36.58 billion by 2031 at a 16.65% CAGR, while SIP trunking - the connective layer between cloud phone systems and the public network - is forecast to more than double from $14.8 billion in 2023 to $43.7 billion by 2031 (Mordor Intelligence, 2026; industry data, 2024). Mobile VoIP is the largest adjacency: more than one billion people place VoIP calls daily through apps like Zoom, WhatsApp, and similar services, and mobile VoIP users are projected to reach 3.6 billion by 2026.
| Metric | Value | Source |
|---|---|---|
| Hosted PBX market (2026) | $16.93B | Mordor Intelligence, 2026 |
| Hosted PBX market (2031 forecast) | $36.58B | Mordor Intelligence, 2026 |
| IP PBX + Cloud PBX market (2026) | $36.13B | Business Research Insights, 2026 |
| SIP trunking market (2023) | $14.8B | Industry data, 2024 |
| SIP trunking market (2031 forecast) | $43.7B | Industry data, 2024 |
| Mobile VoIP market (2026) | $59.92B | Mordor Intelligence, 2026 |
| Mobile VoIP users worldwide (2026 forecast) | 3.6B | Industry data, 2025 |
| Fixed VoIP subscribers worldwide (2024) | 204M | Industry data, 2024 |
Outlier note: mobile VoIP market estimates diverge sharply by methodology, from Mordor’s $59.92 billion for 2026 to a $118.18 billion figure for 2025 from another firm using a broader consumer-app definition.
Sources: Mordor Intelligence - Hosted PBX Market, Mordor Intelligence - Mobile VoIP Market
6. Security, Fraud, and Call Quality
Moving voice onto IP networks trades legacy limitations for internet-era attack surfaces, and the fraud numbers are substantial. The Communications Fraud Control Association estimates global telecom fraud losses near $38 to $40 billion a year, with toll fraud and international revenue share fraud (IRSF) among the largest categories (CFCA, Global Fraud Loss Survey). Consumer exposure is separate but large: US consumers lost about $25.4 billion to phone scams over a recent 12-month period (Truecaller), and Hiya reports that 76% of calls from unknown numbers go unanswered. On the quality side, the engineering targets are well established - a Mean Opinion Score at or above 4.0 (of 5), latency under 150 ms, jitter under 30 ms, and packet loss under 1% keep business calls clear.
| Metric | Value | Source |
|---|---|---|
| Global telecom fraud loss (annual) | ~$38-40B | CFCA, 2025 |
| US consumer phone-scam losses (12 mo) | $25.4B | Truecaller (via Nextiva), 2025 |
| Calls from unknown numbers left unanswered | 76% | Hiya (via Nextiva), 2025 |
| Target MOS for acceptable call quality | 4.0+ (of 5) | Industry standard, 2025 |
| Max one-way latency for good VoIP | Under 150 ms | Industry standard, 2025 |
| Max acceptable jitter | Under 30 ms | Industry standard, 2025 |
| Max acceptable packet loss | Under 1% | Industry standard, 2025 |
| Zoom Phone uptime SLA | 99.999% | Zoom, 2025 |
Because background noise degrades perceived call quality as much as network jitter, real-time noise suppression and voice processing on the endpoint is a practical complement to network-level QoS on any VoIP line.
Sources: Nextiva - VoIP Call Quality, TransNexus - Introduction to VoIP Fraud
7. AI in Cloud Telephony
The 2026 growth story for cloud telephony is increasingly written in AI: agent assistants, real-time transcription, and voice bots layered onto the calling stack. The CPaaS market - the programmable APIs that embed voice and messaging into software - is worth $21.27 billion in 2026 and is forecast to reach $41.05 billion by 2031, while Gartner projects conversational AI will cut contact-center agent labor costs by $80 billion in 2026 (Mordor Intelligence, 2026; Gartner, 2025). Vendors are already monetizing it: RingCentral reported that ARR from customers using at least one paid AI product more than doubled year over year and now approaches 10% of total ARR. The broader conversational AI market is forecast to grow from $17.97 billion in 2026 to $82.46 billion by 2034.
| Metric | Value | Source |
|---|---|---|
| CPaaS market (2026) | $21.27B | Mordor Intelligence, 2026 |
| CPaaS market (2031 forecast) | $41.05B | Mordor Intelligence, 2026 |
| Conversational AI market (2026) | $17.97B | Fortune Business Insights, 2026 |
| Conversational AI market (2034 forecast) | $82.46B | Fortune Business Insights, 2026 |
| Contact-center labor cost cut by conversational AI (2026) | $80B | Gartner, 2025 |
| Agent interactions automated by 2026 | 1 in 10 | Gartner (via Nextiva), 2025 |
| RingCentral AI-monetized ARR share | ~10% of total | RingCentral, 2026 |
| US voice-assistant users (2026 forecast) | 157.1M | Industry data, 2025 |
Sources: Mordor Intelligence - CPaaS Market, Fortune Business Insights - Conversational AI Market
Summary: VoIP And UCaaS by the Numbers
| Metric | Value | Source |
|---|---|---|
| Global VoIP market (2024) | $144.77B | Fortune Business Insights, 2025 |
| VoIP market (2032 forecast) | $326.27B | Fortune Business Insights, 2025 |
| UCaaS market (2026) | $70.56B | Mordor Intelligence, 2026 |
| UCaaS market (2031 forecast) | $221.14B | Mordor Intelligence, 2026 |
| UCaaS users worldwide (2028 forecast) | 131M+ | Cavell, 2024 |
| Teams Phone PSTN users (end 2025) | 26M | Microsoft / Pure-IP, 2025 |
| Zoom Phone seats (Oct 2025) | 10M | Zoom, 2025 |
| RingCentral FY2025 revenue | $2.5B | RingCentral, 2026 |
| 8x8 FY2025 service revenue | $693M | 8x8, 2025 |
| US interconnected VoIP subscriptions (June 2025) | 63M | FCC, 2025 |
| US switched access lines (June 2025) | 15M | FCC, 2025 |
| Switched access line decline (3-yr CAGR) | -17.9% | FCC, 2025 |
| US adults in wireless-only homes | ~76% | CDC/NCHS, 2023 |
| Orgs on cloud office telephony by 2028 | 90% | Gartner, 2025 |
| Cost savings migrating landline to VoIP | 30-50% | Nextiva, 2025 |
| Hosted PBX market (2026) | $16.93B | Mordor Intelligence, 2026 |
| Mobile VoIP users worldwide (2026 forecast) | 3.6B | Industry data, 2025 |
| Global telecom fraud loss (annual) | ~$38-40B | CFCA, 2025 |
| CPaaS market (2026) | $21.27B | Mordor Intelligence, 2026 |
| Conversational AI labor cost cut (2026) | $80B | Gartner, 2025 |
Methodology and Sources
Data was gathered by prioritizing Tier 1 primary sources - government datasets (FCC, CDC/NCHS), company financial disclosures (RingCentral, 8x8, Zoom), and named analyst reports (Gartner, Mordor Intelligence) - and Tier 2 research firms that disclose base years and methodology, with market-size figures cross-referenced across two or more firms and divergences flagged in the text.
Primary and cited sources:
- FCC - Voice Telephone Services Report (June 2025)
- CDC/NCHS - Wireless Substitution, National Health Interview Survey
- Gartner - Magic Quadrant for UCaaS 2025
- Mordor Intelligence - UCaaS Market
- Mordor Intelligence - Hosted PBX Market
- Mordor Intelligence - Mobile VoIP Market
- Mordor Intelligence - CPaaS Market
- Fortune Business Insights - VoIP Market
- Fortune Business Insights - Conversational AI Market
- Grand View Research - UCaaS Market
- Custom Market Insights - UCaaS Market
- Cavell - Global UCaaS to Surpass 131M Users by 2028 (via Computer Weekly)
- Zoom - Zoom Phone Hits 10 Million Seats
- Microsoft / Pure-IP - Teams Phone Reaches 26 Million Users
- RingCentral - Q4 and FY2025 Results
- 8x8 - Q4 and FY2025 Financial Results
- Openreach - PSTN Switch-Off
- Business Research Insights - IP PBX and Cloud PBX Market
- Nextiva - VoIP Statistics 2026
- Nextiva - VoIP Call Quality
- TransNexus - Introduction to VoIP Fraud (CFCA loss figures)
Data watch: the FCC publishes its Voice Telephone Services report twice yearly (a December 2025 status update is expected in H2 2026), the CDC/NCHS releases Wireless Substitution estimates roughly every six months, Gartner refreshes its UCaaS Magic Quadrant annually, and RingCentral, 8x8, and Zoom report quarterly earnings - all likely to move these figures before year-end.
Last updated: July 12, 2026. We review and update this page quarterly as new data is published.