OnSIP is a hosted VoIP phone service that gives a business cloud call routing, auto attendants, queues, SMS and apps without on-site PBX hardware, billed month to month and usable with any SIP device.
OnSIP moves the phone system into the cloud and leaves the choice of handset to you. After signing up, you create extensions and applications in a web portal: an auto attendant to greet callers, queues for groups that share the workload, business hour rules and voicemail, then you decide what each person talks on. Staff can use the free desktop or mobile app, an ordinary SIP desk phone, or a browser, because OnSIP speaks standard SIP rather than a proprietary protocol. Numbers, messaging and call routing all live in the same account, so adding a person means creating an extension instead of ordering hardware, and changes take effect the moment you save them.
Because everything is standard SIP, OnSIP is unusually tolerant about endpoints. A company can mix desk phones, conference units, softphones on laptops and mobile apps inside one OnSIP account, and open-source clients such as Ekiga work alongside commercial apps. That flexibility matters during migration: existing hardware does not have to be scrapped, and a trial can start with a couple of free app users before any phones are ordered. Administration covers the whole organisation through one portal, including call recording, parking and blocking rules, while messaging runs beside voice so customers can text the number they call. Setting expectations is the main job here, because the provider runs the platform while your own network still has to carry the calls.
The financial case for OnSIP rests on flexibility rather than a headline rate. Because adding or removing a user is a portal change, a seasonal team can shrink costs during quiet months, and there is no on-site appliance to replace when it ages. Feature configuration is self-service, so a call flow can be rewritten the same afternoon a process changes instead of waiting on a vendor. Reliability comes from the hosted design: redundant cloud infrastructure means the phone system does not go dark when the office loses power, and calls can be answered from a laptop or mobile while everyone works elsewhere. Messaging sits next to voice in the same apps, which keeps a customer's texts with their calls. For companies with compliance duties the platform is built to support those obligations, and for the technically inclined, standard SIP means preferred handsets and softphone habits survive the move to OnSIP.
Key capabilities and highlights.
Create, rename and remove extensions from a browser without touching hardware, and give each person a direct number or keep them behind a main line. Because the whole phone system is configuration, a new hire can be answering calls minutes after the account is created.
Touchtone menus route callers to the right team, business hour rules send them elsewhere after closing, and announcements play a message before forwarding. OnSIP lets you rebuild that flow yourself, so seasonal greetings and department reshuffles do not need a support ticket.
Distribute calls across a team with queue behaviour instead of ringing one unlucky person. Agents can see who else is free through busy lamp field indicators, and the membership of a queue can be adjusted as staffing changes during a busy afternoon.
Staff choose the free desktop app, the mobile app or a physical desk phone, and callers reach the same OnSIP extension either way. Multi-line handling, hold, mute and transfer behave consistently across devices, so nobody learns a different toolset when working from home.
Send and receive texts from the same number customers call, with messages appearing in the desktop, web and mobile apps. An appointment confirmation or a quick question therefore does not push customers towards a separate consumer messaging account.
Park a call on one device and collect it on another, which suits busy offices where everyone moves between rooms. Recording captures conversations for training or dispute handling, and finished files can be pushed to cloud storage so retention policies are easy to enforce.
Because the platform runs in redundant cloud infrastructure, a power cut or internet outage at the office does not take the phone system with it. Calls can be answered from a laptop or mobile, and the same routing applies wherever staff happen to be sitting.
OnSIP connects to business software through published integrations, including ERP and CRM platforms, so contact records and call activity stay in one place. Mixed environments are supported too, with standard SIP keeping older hardware and open-source softphones in play.
Browse historical releases and previous builds.
Common questions about OnSIP.
It is a hosted business phone service rather than software you install on a server. Numbers, extensions and call routing live in the cloud, and users connect with an app or any SIP-compatible desk phone.
No. Any SIP-compatible device should work, and the free desktop and mobile apps can replace handsets entirely. Many businesses run a mixture, adding desk phones only for shared or reception areas.
Standard SIP registration means third-party and open-source softphones can connect, provided their codecs and settings match what the account expects. That makes it possible to keep a familiar client instead of adopting new apps.
OnSIP is offered on month-to-month terms, so users and features can be added or removed as needs change. That suits businesses with seasonal staffing or projects that start and finish unpredictably.
Yes. Queues, call recording, announcements, business hour rules and busy lamp field presence cover the usual requirements, and queue distribution sends callers to the next available agent rather than to one extension.
Yes. SMS and MMS messages are handled from the business number in the same apps used for calls, so customers can reply to a text or ring back the number that contacted them.
Pricing comes in different shapes, including per-user plans aimed at heavy phone use and account-based plans where extra users do not attract individual charges. Which suits you depends on headcount and call volume, so request a quote.
Because the phone system runs in the cloud, calls can still be routed to mobiles or answered through the app on another connection. Keeping a fallback destination configured in OnSIP before it is needed is the simplest safeguard.
OnSIP is a hosted VoIP phone service that gives a business cloud call routing, auto attendants, queues, SMS and apps without on-site PBX hardware, billed month to month and usable with any SIP device.
MicroSIP is a lightweight open-source SIP softphone for desktop voice and video calls, built on the PJSIP stack and compatible with standard PBX systems and VoIP providers. It suits offices and support desks that want dependable calling, presence, and messaging without heavy software.
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Ekiga is a free, open-source softphone and video conferencing client for Linux and Windows that places audio and video calls over SIP or H.323, with contacts, presence, chat and call forwarding built into one desktop app.
Bria is a SIP softphone that turns a Windows, macOS, iOS or Android device into a business phone, handling HD voice and video calls, messaging and screen sharing through the accounts your organisation already owns.
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