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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    Softphones
     
    3CXPhone - Softphone  

    To call using IP technology we only need an IP telephone or a program that emulate it in our computer.

    The software program which emulates the IP phones is called Softphone. Most of them are for free.

    Besides, we have created the 3CXPhone installation and configuration guide to help you with one of the best softphone so you can test it and enjoy the experience of voip. 3CXPhone is available on Windows, IPhone and Android OS.

     
       
     

    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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