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    Overview
    ProductRatingMost Used ByProduct SummaryStarting Price

    Kamailio SIP Server

    Score9 out of 10
    N/AThe Kamailio SIP Server, formerly known as OpenSER or SER, is an open source VoIP and communications platform.N/A

    OnSIP

    Score9 out of 10
    N/AOnSIP's range of hosted VoIP solutions are described by the vendor as simple to set up and easy to use, so users can get on with the business of connecting with customers. OnSIP was an Intrado solution, and then acquired by Ooma in 2022.N/A
    Pricing
    Kamailio SIP ServerOnSIP
    Editions & Modules
    No answers on this topic
    No answers on this topic
    Offerings
    Pricing Offerings
    Kamailio SIP ServerOnSIP
    Free Trial
    NoNo
    Free/Freemium Version
    NoNo
    Premium Consulting/Integration Services
    NoNo
    Entry-level Setup FeeNo setup feeNo setup fee
    Additional Details——
    More Pricing Information
    Features
    Kamailio SIP ServerOnSIP
    Cloud PBX
    Comparison of Cloud PBX features of Kamailio SIP Server and OnSIP
    Feature
    Kamailio SIP Server
    8.0
    1 Ratings
    1% above category average
    OnSIP
    -
    Ratings
    Hosted PBX8.01 Ratings00 Ratings
    Multi-level Interactive Voice Response (IVR)9.01 Ratings00 Ratings
    User templates7.01 Ratings00 Ratings
    Call reports8.01 Ratings00 Ratings
    Directory of employee names8.01 Ratings00 Ratings
    Call Management
    Comparison of Call Management features of Kamailio SIP Server and OnSIP
    Feature
    Kamailio SIP Server
    8.4
    1 Ratings
    2% above category average
    OnSIP
    9.5
    1 Ratings
    14% above category average
    Answering rules9.01 Ratings8.01 Ratings
    Call recording8.01 Ratings00 Ratings
    Call park9.01 Ratings10.01 Ratings
    Call screening8.01 Ratings10.01 Ratings
    Message alerts8.01 Ratings10.01 Ratings
    VoIP system collaboration
    Comparison of VoIP system collaboration features of Kamailio SIP Server and OnSIP
    Feature
    Kamailio SIP Server
    7.5
    1 Ratings
    6% below category average
    OnSIP
    -
    Ratings
    Video conferencing7.01 Ratings00 Ratings
    Audio conferencing8.01 Ratings00 Ratings
    Video screen sharing7.01 Ratings00 Ratings
    Instant messaging8.01 Ratings00 Ratings
    Best Alternatives
    Kamailio SIP ServerOnSIP
    Small Businesses
    CallFire
    Score9.7 out of 10
    CallFire
    Score9.7 out of 10
    Medium-sized Companies
    Fuze
    Score8.2 out of 10
    Fuze
    Score8.2 out of 10
    Enterprises
    Cisco Unified Communications Manager (Call Manager)
    Score8.3 out of 10
    Cisco Unified Communications Manager (Call Manager)
    Score8.3 out of 10
    All AlternativesView all alternativesView all alternatives
    User Ratings
    Kamailio SIP ServerOnSIP
    Likelihood to Recommend
    9.0
    (1 ratings)
    10.0
    (1 ratings)
    User Testimonials
    Kamailio SIP ServerOnSIP
    Likelihood to Recommend
    Open Source
    Kamailio SIP Server is very well suited if you want to secure your main servers; it can perfectly act as a proxy server and a gateway to your main server. It also does load balancing and call transfers easily based on the configurations done.
    Incentivized
    Read full review
    Ooma, Inc.
    I think OnSIP is well suited to be used in any organization that has a stable, reliable internet connection. The service is top notch and I haven't found a competitor that can beat the service. I've recommended the service to other manufacturing businesses and churches. The organizations that have switched have been extremely pleased with the service.
    Incentivized
    Read full review
    Pros
    Open Source
    • Proxy server.
    • Security Firewall.
    • SIP to PSTN gateway.
    Incentivized
    Read full review
    Ooma, Inc.
    • Customer service
    • Value pricing
    • Ease of use
    Incentivized
    Read full review
    Cons
    Open Source
    • Interportability
    • SIP conversions.
    Incentivized
    Read full review
    Ooma, Inc.
    • Accept more phone brands/models
    • Make your website easier to use
    • Make provisioning a new phone easier
    Incentivized
    Read full review
    Alternatives Considered
    Open Source
    As Kamailio SIP Server is an open source, the major impact is on cost; it's free to use compared to any other Softswitch or server in the market. You can also customize it to your need and use the features that you need, which is one of the major plus points for the Kamailio SIP Server. And one server is enough to handle thousands of calls simultaneously.
    Incentivized
    Read full review
    Ooma, Inc.
    We have found OnSIP to be just as good if not better than any of the other services we have researched or used. Once again, the value of OnSIP is unbelievable. Our rates at this organization are less than half of what the competitors were charging. I don't see us changing anytime soon.
    Incentivized
    Read full review
    Return on Investment
    Open Source
    • As its open source ROI is excellent.
    Incentivized
    Read full review
    Ooma, Inc.
    • It has reduced our telecom expenses drastically.
    Incentivized
    Read full review
    ScreenShots