OnSIP

OnSIP is ranked #8 of 174 in business phone systems on Freedom251, made by OnSIP (Sunnyvale, California, United States). It runs on Android, iOS, macOS, Web, Windows. There is a free plan. Paid plans start at $18.95/mo.

OnSIP plans and pricing

All plans

Free Plan Free 100 users onsip.com · 28 Sept 2026

Unlimited $18.95/mo Minimum 5 users 5 users minimum · 250 SMS/MMS per account onsip.com · 28 Sept 2026

Basic $49.95/mo Calling minutes and messaging not included 3 auto attendants · 3 ring groups · 5 voicemail boxes · 1 call recording user onsip.com · 28 Sept 2026

Pay-as-you-go $49.95/mo $49.95 per month, per account onsip.com · 28 Sept 2026

Compared on business phone systems

Free plan: Yes
Paid from: $18.95/user/mo
Included users: 5 users
Business numbers: multiple
Auto attendant: Yes
Call routing: custom
Voicemail transcription: Yes
Desktop and mobile apps: Yes

Best OnSIP alternatives

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Microsoft Teams Free plan AndroidiOSLinuxMacWeb

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$100/mo7.7 PortSIP PBX Free plan

Free7.6

OnSIP

Billing model: Month-to-month contracts are available, with payment based on needed users and features.
Free plan limits: The free plan supports up to 100 users and unlimited extensions.
Free calling limit: Free SIP accounts cannot dial regular phone numbers; paid plans offer SIP-to-PSTN gateway service.
Free integrations: The free plan includes Zendesk, HubSpot, and Odoo integrations.
Supported platforms: Apps are available for Windows, Mac, web, iPhone, and Android.
Browser support: The browser softphone is available in Chrome, Firefox, and Opera.
Device registrations: A SIP address can have active registrations on up to 10 devices.
Call encryption: Softphone apps provide end-to-end encryption, with encryption also available for desk phones.
Media encryption: OnSIP professional call-link media is encrypted using DTLS SRTP when both parties use the OnSIP app.
HIPAA support: The platform can be used by businesses to comply with HIPAA obligations.
Team management: Users and features can be added or removed to customize the phone system.
Admin tools: The Admin Portal supports setup, real-time feature edits, payment and contact management, and invoices.
CRM integrations: Available integrations include HubSpot, Odoo, Zendesk, and an Open API.
Support recognition: Gartner Digital Markets gave OnSIP a Best Customer Support badge for four consecutive years.
Price from: $18.95/mo

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Where it ranks on Freedom251

Best Business Phone Systems in 2026#8 of 174

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Sources

onsip.com· checked 28 Sept 2026
onsip.com/getonsip· checked 28 Sept 2026
onsip.com/pricing· checked 28 Sept 2026