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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

    VirtualPBX

    Score10 out of 10
    N/AVirtualPBX is a VoIP solution that in addition to VoIP offers analog, smartphone, WebRTC, SIP Trunking & native calling options. It can also be used as a virtual contact center or virtual office solution.

    $18

    per month per user

    Pricing
    Kamailio SIP ServerVirtualPBX
    Editions & Modules
    No answers on this topic
    Flex
    $18
    per month per user
    Pro
    $27
    per month per user
    Ultra
    $36
    per month per user
    Offerings
    Pricing Offerings
    Kamailio SIP ServerVirtualPBX
    Free Trial
    NoYes
    Free/Freemium Version
    NoNo
    Premium Consulting/Integration Services
    NoNo
    Entry-level Setup FeeNo setup feeOptional
    Additional Details—Discount available for annual pricing.
    More Pricing Information
    Features
    Kamailio SIP ServerVirtualPBX
    Cloud PBX
    Comparison of Cloud PBX features of Kamailio SIP Server and VirtualPBX
    Feature
    Kamailio SIP Server
    8.0
    1 Ratings
    1% above category average
    VirtualPBX
    9.4
    3 Ratings
    17% above category average
    Hosted PBX8.01 Ratings10.03 Ratings
    Multi-level Interactive Voice Response (IVR)9.01 Ratings9.53 Ratings
    User templates7.01 Ratings9.53 Ratings
    Call reports8.01 Ratings9.03 Ratings
    Directory of employee names8.01 Ratings9.03 Ratings
    Call Management
    Comparison of Call Management features of Kamailio SIP Server and VirtualPBX
    Feature
    Kamailio SIP Server
    8.4
    1 Ratings
    2% above category average
    VirtualPBX
    9.7
    3 Ratings
    17% above category average
    Answering rules9.01 Ratings9.53 Ratings
    Call recording8.01 Ratings10.02 Ratings
    Call park9.01 Ratings9.01 Ratings
    Call screening8.01 Ratings10.02 Ratings
    Message alerts8.01 Ratings10.02 Ratings
    VoIP system collaboration
    Comparison of VoIP system collaboration features of Kamailio SIP Server and VirtualPBX
    Feature
    Kamailio SIP Server
    7.5
    1 Ratings
    6% below category average
    VirtualPBX
    9.8
    1 Ratings
    21% above category average
    Video conferencing7.01 Ratings10.01 Ratings
    Audio conferencing8.01 Ratings10.01 Ratings
    Video screen sharing7.01 Ratings9.01 Ratings
    Instant messaging8.01 Ratings10.01 Ratings
    Mobile apps
    Comparison of Mobile apps features of Kamailio SIP Server and VirtualPBX
    Feature
    Kamailio SIP Server
    -
    Ratings
    VirtualPBX
    9.0
    1 Ratings
    13% above category average
    Mobile app for iOS00 Ratings9.01 Ratings
    Mobile app for Android00 Ratings9.01 Ratings
    Best Alternatives
    Kamailio SIP ServerVirtualPBX
    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 ServerVirtualPBX
    Likelihood to Recommend
    9.0
    (1 ratings)
    10.0
    (5 ratings)
    Likelihood to Renew
    -
    (0 ratings)
    10.0
    (2 ratings)
    Usability
    -
    (0 ratings)
    10.0
    (2 ratings)
    User Testimonials
    Kamailio SIP ServerVirtualPBX
    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
    VirtualPBX
    We consider that it is a very complete internet call software that is worth having in all companies that want to increase their sales through customer service agents because, with all its tools, agents improve their workday by day.
    Incentivized
    Read full review
    Pros
    Open Source
    • Proxy server.
    • Security Firewall.
    • SIP to PSTN gateway.
    Incentivized
    Read full review
    VirtualPBX
    • Easy to set up your menu and record greetings and Prompts
    • Forwards to our cell phones or landlines -- and voicemail to email
    • Allows outbound calls on the rare occasion we require hiding
    • Simple website for end users - but they almost never need to use it.
    Incentivized
    Read full review
    Cons
    Open Source
    • Interportability
    • SIP conversions.
    Incentivized
    Read full review
    VirtualPBX
    • Possibly a better way of covering the one zillion features and functions in classes
    • Possibly a better way of covering the one zillion features and functions in classes
    Incentivized
    Read full review
    Likelihood to Renew
    Open Source
    No answers on this topic
    VirtualPBX
    Once it works and has retain ROI.....keep it going
    Read full review
    Usability
    Open Source
    No answers on this topic
    VirtualPBX
    So much easier than our old PBX or any on-prem PBX I have ever used. We were up and running in an hour. Tweaking the caller menus is so easy.
    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
    VirtualPBX
    Auto attendant and voice conference capabilities are a good value for SOHO users that need to make a positive impression upon their customers.
    Incentivized
    Read full review
    Return on Investment
    Open Source
    • As its open source ROI is excellent.
    Incentivized
    Read full review
    VirtualPBX
    • We have been able to improve greatly with this software, our communications and interactions with customers improved, and agent performance and productivity improved, which translates into higher profits for the company. It is easy to use this program, so it did not take us long to adapt to it and its functions.
    Incentivized
    Read full review
    ScreenShots