| Vendor | Best For | Pricing | Contract | International | Contact Center | ITG Rating |
|---|---|---|---|---|---|---|
| RingCentral MVP | 25–500 seat mid-market | $20–$35/user/month | 1–3 year, auto-renews 30 days | 40+ included, 100+ add-on | RingCX (integrates well) | |
| Microsoft Teams Phone | M365 E3/E5 orgs | $8–$15/user/month add-on | Monthly via M365 | Limited (35 countries) | Requires third-party | |
| Zoom Phone | Video-first, remote teams | $10–$25/user/month | Monthly or annual | 40+ countries | Zoom Contact Center (newer) | |
| 8x8 XCaaS | Contact center orgs | $15–$44/user/month | 1–3 year, 60-day cancel | Unlimited to 40+ | Best-in-class CCaaS | |
| Vonage Business | API-driven, small-to-mid | $13–$28/user/month | Monthly or annual | 35+ countries | Vonage Contact Center |
ITG Picks
Best Overall
RingCentral MVP
The most balanced UCaaS solution for organizations with 25-500 users. Strong feature set, proven reliability, and excellent support for both voice and contact center needs.
25–500 seat mid-market • $20–35/user/month
Best for M365 Shops
Microsoft Teams Phone
If your organization is already heavily invested in Microsoft 365 E3/E5, Teams Phone is the natural choice. Native integration means no context switching.
M365 E3/E5 only • Direct Routing or Calling Plans
Best for Contact Centers
8x8 XCaaS
8x8's unified UCaaS + CCaaS platform is purpose-built for customer-facing teams. Best-in-class contact center capabilities with integrated voice infrastructure.
Contact center orgs • $15–44/user/month
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