OnSIP
onsip.com
What it is
OnSIP is a business phone system with multiple business numbers, an auto attendant, custom call routing, and voicemail transcription. It provides desktop and mobile apps as well as a browser softphone, available in Chrome, Firefox, and Opera. Apps are listed for Windows, Mac, iPhone, and Android. The free plan supports up to 100 users and unlimited extensions, and includes Zendesk, HubSpot, and Odoo integrations. Free SIP accounts cannot dial regular phone numbers; paid plans offer a SIP-to-PSTN gateway. Paid plans start at $18.95/user/mo, and a 30-day trial is listed. Month-to-month contracts are available, with payment based on users and features. A SIP address can have active registrations on up to 10 devices. Softphone apps provide end-to-end encryption, and encryption is also available for desk phones. When both parties use the OnSIP app, professional call-link media is encrypted using DTLS SRTP. The Admin Portal supports setup, real-time feature edits, payment and contact management, and invoices.
Spec sheet
- Free plan
- YesRead 22 Sep 2026 · onsip.com
- Paid from
- 18.95Read 22 Sep 2026 · onsip.com
- CRM integrations
- Available integrations include HubSpot, Odoo, Zendesk, and an Open API.Read 28 Sep 2026 · onsip.com
- Headquarters
- Sunnyvale, California, United StatesRead 28 Sep 2026 · onsip.com
- Founded
- 2004Read 28 Sep 2026 · onsip.com
- Admin tools
- The Admin Portal supports setup, real-time feature edits, payment and contact management, and invoices.Read 28 Sep 2026 · onsip.com
- Audio conference limit
- Audio conference suites support up to 15 simultaneous callers.Read 28 Sep 2026 · onsip.com
- Auto attendant
- YesRead 22 Sep 2026 · onsip.com
- Billing model
- Month-to-month contracts are available, with payment based on needed users and features.Read 28 Sep 2026 · onsip.com
- Browser support
- The browser softphone is available in Chrome, Firefox, and Opera.Read 28 Sep 2026 · onsip.com
- Business customers
- OnSIP says it is trusted by more than 150,000 businesses.Read 28 Sep 2026 · onsip.com
- Business numbers
- multipleRead 22 Sep 2026 · onsip.com
- Call encryption
- Softphone apps provide end-to-end encryption, with encryption also available for desk phones.Read 28 Sep 2026 · onsip.com
- Call routing
- customRead 22 Sep 2026 · onsip.com
- Desktop and mobile apps
- YesRead 22 Sep 2026 · onsip.com
- Device registrations
- A SIP address can have active registrations on up to 10 devices.Read 28 Sep 2026 · onsip.com
- Free calling limit
- Free SIP accounts cannot dial regular phone numbers; paid plans offer SIP-to-PSTN gateway service.Read 28 Sep 2026 · onsip.com
- Free integrations
- The free plan includes Zendesk, HubSpot, and Odoo integrations.Read 28 Sep 2026 · onsip.com
- Free plan limits
- The free plan supports up to 100 users and unlimited extensions.Read 28 Sep 2026 · onsip.com
- HIPAA support
- The platform can be used by businesses to comply with HIPAA obligations.Read 28 Sep 2026 · onsip.com
- Included users
- 5Read 22 Sep 2026 · onsip.com
- Knowledge base
- The knowledge base contains setup articles, instructions, and video walkthroughs built over 20 years.Read 28 Sep 2026 · onsip.com
- Media encryption
- OnSIP professional call-link media is encrypted using DTLS SRTP when both parties use the OnSIP app.Read 28 Sep 2026 · onsip.com
- SMS plan availability
- SMS and MMS are available on both Basic and Unlimited plans.Read 28 Sep 2026 · onsip.com
- Support recognition
- Gartner Digital Markets gave OnSIP a Best Customer Support badge for four consecutive years.Read 28 Sep 2026 · onsip.com
- Supported platforms
- Apps are available for Windows, Mac, web, iPhone, and Android.Read 28 Sep 2026 · onsip.com
- Team management
- Users and features can be added or removed to customize the phone system.Read 28 Sep 2026 · onsip.com
- Video call limit
- Web and desktop video conferences support up to five people.Read 28 Sep 2026 · onsip.com
- Voicemail transcription
- YesRead 22 Sep 2026 · onsip.com
Plans and prices
Free Plan Free 100 users Up to 100 users with unlimited extensions; phone-number dialing unavailable Read 28 Sep 2026 · onsip.com
Unlimited $18.95 a month Minimum 5 users 5 users minimum · 250 SMS/MMS per account Minimum 5 users Read 28 Sep 2026 · onsip.com
Basic $49.95 a month Calling minutes and messaging not included 3 auto attendants · 3 ring groups · 5 voicemail boxes · 1 call recording user Calling minutes and messaging not included Read 28 Sep 2026 · onsip.com
Pay-as-you-go $49.95 a month $49.95 per month, per account Calling minutes not included Read 28 Sep 2026 · onsip.com
Strong points and limits
Strong points
- Free plan supports up to 100 users
- Includes unlimited extensions on the free plan
- Offers custom call routing and voicemail transcription
- Month-to-month contracts are available
Limits
- Free SIP accounts cannot dial regular phone numbers
- Paid plans start at $18.95/user/mo
- Video conferences support up to five people
Who it suits
OnSIP suits businesses that need a phone system with mobile, desktop, and browser access, custom call routing, and multiple business numbers. The free plan may fit teams that do not need to dial regular phone numbers through free SIP accounts.
Verdict
OnSIP provides a broad set of business calling and administration features, with a free plan for up to 100 users. Check the free calling restriction and the paid-plan pricing before choosing a plan.
Where Specifiction places it
- Business Phone Systems#8 of 1679.2
- Cloud PBX Software#4 of 278.9
