OnSIP —
Cloud UCaaS, SIP Trunking & WebRTC APIs for SMBs

OnSIP is a cloud UCaaS platform delivering business phone, SIP trunking, video conferencing, and WebRTC/SIP developer APIs. OnSIP is now part of the Ooma family of brands — operating as a distinct platform alongside Ooma Office and Ooma Enterprise. OnSIP is particularly known for its developer-friendly approach to cloud communications, offering open SIP infrastructure and WebRTC APIs alongside standard business UCaaS functionality.

OnSIP is well suited for two primary audiences: SMBs looking for a cloud business phone system with video, mobile, and desktop apps; and developers building custom communication applications using SIP and WebRTC APIs. The platform's open architecture and API access make it a strong choice for organizations that want to embed calling or communications into their own applications or workflows — beyond what most business phone systems offer.

OnSIP UCaaS is a complete hosted phone system — delivering phone numbers, extensions, call routing, voicemail, mobile apps, and video meetings as a managed cloud service with no PBX hardware required. OnSIP SIP Trunking, by contrast, is designed for organizations that already own a PBX or contact center system and need carrier-grade SIP connectivity to the public telephone network. With SIP Trunking, OnSIP provides the PSTN access while the customer's existing PBX handles call routing and features.

OnSIP's SIP and WebRTC APIs enable developers to build custom communication applications including embedded click-to-call functionality in websites or apps, browser-based softphones, custom contact center interfaces, automated calling systems, and any application requiring real-time voice or video communication. The APIs are built on open standards (SIP and WebRTC), making them compatible with a wide range of development environments and integration scenarios.

Yes. OnSIP includes integrated video conferencing within the platform — allowing users to initiate video meetings directly from their OnSIP phone system without switching to a separate video application. This native integration simplifies the communications stack for SMBs that want voice, video, and messaging managed in one platform rather than juggling separate tools.

No. Your agreement is signed directly with OnSIP — Fibi is not a party to it. Fibi's advisory is funded by a referral arrangement OnSIP maintains from their existing sales budget, which does not affect your pricing. Fibi evaluates OnSIP alongside competing UCaaS and SIP providers so you can compare features, architecture fit, and cost before committing.