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Introduction to VOIP

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  • #20566 Reply
    Hamid
    Guest

    I am familier with voip and interest to now how can i tune a voip?wath is its needed environment? wath is ss7
    and h323 protocol?
    would you like to help me?

    #20567 Reply
    Khaled
    Guest

    Hamid:

    Go to http://www.data.com for SS7 and other definitions:

    SS7

    (Signaling System 7) The protocol used in the public switched telephone system (the “intelligent network” or “advanced intelligent network”) for setting up calls and providing services. SS7 is a separate signaling network that is used in Class 4 and Class 5 voice switches.

    The SS7 network sets up and tears down the call, handles all the routing decisions and supports all modern telephony services such as 800 numbers, call forwarding, caller ID and local number portability (LNP). The voice switches known as “service switching points” (SSPs) query “service control point” (SCP) databases using packet switches known as “signal transfer points” (STPs).

    Accessing databases using a separate signaling network enables the system to more efficiently obtain static information such as the services a customer has signed up for and dynamic information such as ever-changing traffic conditions in the network. In addition, a voice circuit is not tied up until a connection is actually made between both parties.

    There is an international version of SS7 standardized by the ITU, and national versions determined by each country. For example, ANSI governs the U.S. standard for SS7, and Telcordia (Bellcore) provides an extension of ANSI for its member companies. See AIN, Class 4 switch, Class 5 switch and CCIS.

    H.323

    An ITU standard for realtime, interactive voice and videoconferencing over LANs and the Internet. Widely used for IP telephony, it allows any combination of voice, video and data to be transported. H.323 specifies several video codecs, including H.261 and H.263, and audio codecs, including G.711 and G.723.1. Gateways, gatekeepers and multipoint control units (MCUs) are also covered. See MGCP and SIP.

    #20568 Reply
    Obinna
    Guest

    I am really interested in VOIP and wanted to find out how I coud use VOIP on cards and also to find out if it can be recognised.

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