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سلسلة حلقات في VoIP

  1. #1
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    سلسلة حلقات في VoIP

    بسم الله الرحمن الرحيم
    في البداية اتمني ان تقبلوني كعضو في هذا الصرح العظيم الذي يضم نخبة من المهندسين الاجلاء مثل حضراتكم
    نظرا لانتشار تقنية الفويب واقترابها من غزو الاسواق العربية اتمني ان احضر اليكم بعض المعلومات عنها ولكني لا اعرف من اين ابدا لذا اخترت ان ابدا من البداية
    اتمني خلال هذة السلسة ان اكون قد قدمت شيئال مفيدا شكرا ليكم
    اخوكم وليد شندي
    What is VoIP?
    VoIP stands for 'V'oice 'o'ver 'I'nternet 'P'rotocol. As the term says VoIP tries to let go voice (mainly human) through IP packets and, in definitive through Internet. VoIP can use accelerating hardware to achieve this purpose and can also be used in a PC environment.
    How does it work?
    sending a signal to a remote destination could have be done also in a digital fashion: before sending it we have to digitalize it with an ADC (analog to digital converter), transmit it, and at the end transform it again in analog format with DAC (digital to analog converter) to use it.
    VoIP works like that, digitalizing voice in data packets, sending them and reconverting them in voice at destination.
    Digital format can be better controlled: we can compress it, route it, convert it to a new better format, and so on; also we saw that digital signal is more noise tolerant than the analog one
    TCP/IP networks are made of IP packets containing a header (to control communication) and a payload to transport data: VoIP use it to go across the network and come to destination.
    Voice (source) - - ADC - - - - Internet - - - DAC - - Voice (dest)
    What is the advantages using VoIP rather PSTN?
    When we are using PSTN line, we typically pay for time used to a PSTN line manager company: more time we stay at phone and more you'll pay. In addition we couldn't talk with other that one person at a time.
    In opposite with VoIP mechanism we can talk all the time with every person we want (the needed is that other person is also connected to Internet at the same time), as far as we want (money independent) and, in addition, we can talk with many people at the same time.
    we can consider that, at the same time, we can exchange data with people are we talking with, sending images, graphs and videos.
    Then, why everybody doesn't use it yet?
    Unfortunately we have to report some problem with the integration between VoIP architecture and Internet. As you can easy imagine, voice data communication must be a real time stream (we couldn't speak, wait for many seconds, then hear other side
    answering): this is in contrast with the Internet heterogeneous architecture that can be made of many routers (machines that route packets), about 20-30 or more and can have a very high round trip time (RTT), so we need to modify something to get it properly working.
    we will show how to solve this great problem. In general we know that is very difficult to guarantee a bandwidth in Internet for VoIP application



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  2. #2
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    Types of VoIP
    PC to PC - this is the old software model where you installed software on your desktop which enabled you to talk over the public Internet. This was more of a hobbyist technology than a real business application, particularly due to the poor quality of the voice transmitted over the network.

    Figure ( 1 ) PC to PC



    Figure ( 2 ) PC to phone



    PC to Phone - voice goes from a PC over a packet network to a phone.



    [Figure ( 3 ) phone to phone




    Phone to Phone - Voice over IP (VoIP) or via a phone to phone connection.



    Figure ( 4 ) phone to phone via gateways



    In this model, gateways are required to adapt traditional analog telephony to the Internet. While you'll often hear references to voice over the Internet, packet telephony really refers to the transmission of voice over any packet network, such as ATM or frame relay.



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  3. #3
    عضو فعال جداً

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    شكررررررررررررررررررررررررررا على هذا المجهود الرائع
    ونرجو معلومات أكثر


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    التعديل الأخير تم بواسطة م/هبة ; 2006-08-20 الساعة 10:01 AM

  4. #4
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    اشكرك يا بشمهندسة وباذن الله غدا سوف اكتب حلقة جديدة


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  5. #5
    تم إيقافه لمخالفة القوانين

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    اسف نسيت حاجة بالنسبة لتكملة الحلقات عايزنها تتكمل بالشكل دة ولا ابعت ملفات بي دي اف ولا ابعت كتب؟؟؟
    مستني الرد:confused:


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  6. #6

  7. #7
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    الكتب

    شكرا يا بشمهندسة هبة عالرد وياريت الكتب دي تنفعك


    الرابط
    http://rapidshare.de/files/7127112/VOIP4D.rar.html

    او


    http://rapidshare.de/files/26266108/...or.Dummies.rar



    Title: Implementing Voice over IP
    ISBN: 0471216666
    Author: Bhumip Khasnabish
    Publisher: Wiley-Interscience
    Edition: 1st edition (May 23, 2003)
    Pages: 217 pages

    Summary:
    * Public and private networks will eventually be configured in such a way that all voice calls are routed using Internet protocols
    * Reviews existing and emerging standards for voice over IP
    * Provides detailed guidance on how to engineer an efficient VoIP network
    * Discusses quality of service (QoS) enforcement techniques
    * Shows how to prototype and test a network's performance

    الرابط بتاع اهوة
    http://rapidshare.de/files/6951503/I...er_IP.rar.html

    بس يا ريت يا بشمهندسة اعرف بس تفكيرك وصل لفين في الفويب ومحتاجة في اية بالظبط عشان اقدر افيدك
    اخوكي وليد شندي


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  8. #8

  9. #9
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    http://rapidshare.de/files/9130619/fthinvp.rar.html
    Password: www.AvaxHome.ru

    وعلي فكرة الكتاب التاني اللينك بتاعة شغال
    شكرا ليكي


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  10. #10

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