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need help about question

Viewing 15 posts - 1 through 15 (of 23 total)
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  • #29784 Reply
    Gaurav Lohiya
    Guest

    Voice-over-IP (VoIP) is based on the UDP protocol. This is because UDP has a lower overhead than TCP. What is the effective percentage gain in throughput (of any given payload) using UDP vs TCP?

    #29785 Reply
    Tom Howard
    Guest

    UDP has an 8 octet header, and TCP usually has a 20 octet header. Both require an IP header and an RTP header, which together add 32 octets.

    The percentage difference between UDP and TCP depends on the size of the payload. A 20 octet payload is typical (G.729 with a sample sent every 20ms).

    But, that’s not the whole story. TCP takes longer to process at the end points because they check whether data is received in the correct order and whether retransmissions are required. This is an unnecessary overhead, because if TCP detects a transmission problem, there is no point in retransmitting. Voice is real time, so if samples do not arrive, they are considered lost and the codec software just “gets on with life” 🙂

    #29786 Reply
    Gaurav
    Guest

    hi,

    I m satisfied with the answer given by froum.that is the answaer i am looking for.

    Thanks a lot to everyone as i get,what i want.

    #29787 Reply
    Azeem s Shaikh
    Guest

    Voice-over-IP (VoIP) is based on the UDP protocol. This is because UDP has a lower overhead than TCP. What is the effective percentage gain in throughput (of any given payload) using UDP vs TCP?

    #29788 Reply
    Tom Howard
    Guest

    Didn’t I just answer that one?

    #29789 Reply
    rahul bose
    Guest

    Voice-over-IP (VoIP) is based on the UDP protocol. This is because UDP has a lower overhead than TCP. What is the effective percentage gain in throughput (of any given payload) using UDP vs TCP?

    #29790 Reply
    aba
    Guest

    7. Voice-over-IP (VoIP) is based on the UDP protocol. This is because UDP has a lower overhead than TCP. What is the effective percentage gain in throughput (of any given payload) using UDP vs TCP?

    #29791 Reply
    Tom Howard
    Guest

    I see. So, I wasted my time answering the latest exam question – question 7. And from the look of the confused responses, it seems that no one understood it anyway. Let’s hope none of you ever make it into the industry.

    #29792 Reply
    Amol from Pune
    Guest

    7. Voice-over-IP (VoIP) is based on the UDP protocol. This is because UDP has a lower overhead than TCP. What is the effective percentage gain in throughput (of any given payload) using UDP vs TCP?

    immediately withing 5 minutes i want this answer

    #29793 Reply
    Noname
    Guest

    My teenager daughter will not lower the volume on the stereo.

    I want the VOIP comunity to give mea step by step procedure to make this trouble go away.

    Right NOW!!!!!!!

    I guess this question is as ridicule as some others…….

    #29794 Reply
    Dana
    Guest

    Can the overhead due to retransmission in TCP be quantised? i mean, is there any probability and stats.. like expected number of lost packets..

    #29795 Reply
    prakash
    Guest

    Voice-over-IP (VoIP) is based on the UDP protocol. This is because UDP has a lower overhead than TCP. What is the effective percentage gain in throughput (of any given payload) using UDP vs TCP?

    please answer within 5 minutes

    #29796 Reply
    leena
    Guest

    Voice-over-IP (VoIP) is based on the UDP protocol. This is because UDP has a lower overhead than TCP. What is the effective percentage gain in throughput (of any given payload) using UDP vs TCP?

    #29797 Reply
    nita
    Guest

    Voice-over-IP (VoIP) is based on the UDP protocol. This is because UDP has a lower overhead than TCP. What is the effective percentage gain in throughput (of any given payload) using UDP vs TCP?

    #29798 Reply
    sagar
    Guest

    tom r u there

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