Voip Think- Voice over IP - Asterisk and SER - SIP IAX and H323

3CX VoIP Phone System, IP PBX for Windows
3CX PBX and Phone System for Windows
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  • VoIP Protocols
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  • Telephones
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  • QoS (Quality of Service)
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  • Codecs
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  • Asterisk
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  • 3CX PBX
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  • SER (Sip Express Router)
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  • More information
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    ¿What is WebRTC?



    WebRTC is a technology supported by the World Wide Web Consortium (W3C) that allows open standard browsers to communicate with each other and exchange audio, video and even files using a simple Javascript based API. WebRTC effectively gives users the ability to make audio or video calls with each other without requiring a plugin or any additional software to be installed.

    The WebRTC standard is gaining significant momentum and Google Chrome, Mozilla Firefox and Opera fully support it. Microsoft, not surprisingly, is trying to push its own "standard". Apple is still on the fence but likely to join the WebRTC wave soon. Even without WebRTC support in Apple's browser it's possible to use the technology on Apple devices.

    WebRTC is an API, not an application. It's application vendors (such as 3CX) that must leverage the technology for it to be useful for users. For example, there are a lot of basic services that demonstrate how easily you can connect two browsers and make a call.

    Whatsapp is rumored to use WebRTC to deliver audio calling between its users. Clearly, WebRTC will do for communications what HTML did for information - start a revolution that will make communications richer (video) and accessible to all (free).

    More information about the psibilities of WebRTC in the following link: WebRTC
     
     

    VoIP Protocols

    ¿How does VoIP works?

    VoIP works with three main protocols called SIP, H.323 and IAX. They have some advantages and weak points.

    You can know how they work with a graphic example of each protocol in a setup and disconnect operation.

    Or you can compare them: SIP vs H.323 Comparative or SIP vs IAX Comparative


    PBX installation and configuration

    Asterisk is an open-source software implementation of a PBX (Private branch exchange).

    Asterisk can be installed under windows OS (Asterisk for windows) or can also be installed under linux OS (Asterisk for linux). You can find all the information in information about Asterisk

    3CX is another commercial PBX on WIndows that you can use for the same purpose. You have all the information about this PBX at 3CX PBX


    New VoIp codecs

    We have added to our website a new section with some VoIP codecs that are being used.

    For example, G 721.1, G729.1 y G.722.2 versions. In general all the changes try to get an audio bandwidth of 50 Hz to 7 kHz in order to provide acceptable music quality.

    In addition, you can take a look to G.711 codec process to learn how a codec is built and then compare the audio samples to note how the voice quality is lower as the bandwith is reduced.

     
    QoS - Voip Quality of service
    Quality of service can be a problem in a voip communication. We do not hear or we the conversation is not very clear

    If we know the main problems that can affect the quality maybe we can solve them

    The main problems in a Voip system we need to be concern of are Latency, Jitter, packet loss, Bandwidth and Echo.

    SIP Error Messages



    Sometimes you need to know the most common SIP error messages and their meaning.

    Sometimes everything work ok and the messages only said to you that the called user is busy or has rejected the call.

    On the other hand, sometimes the network or the service provider is down and you cannot use the service.

    [ + info about SIP errors]

    DSS1 codes


    VoIP Glossary


    Sometimes reading a tutorial or using a program we see words or acronims that we do not know what they mean and we only need a little definition. We can use the voip glossary of VoIP terms.

     

     

     
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