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Voice Packet Size

Viewing 5 posts - 1 through 5 (of 5 total)
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  • #33200 Reply
    Ramasamy
    Guest

    hai all,
    i’m doing project in Voip,i need to know the packet size withheader compression & without header compression.kindly help me in this one.it is very urgent.mt mail ID :ramasamy1979@yahoo.com
    ramm_1979@usa.net
    thank u.

    #33201 Reply
    Alex Yuen
    Guest

    Calculation of Bandwidth in VoIP

    No. of Frames 1 2 3 4 5 6 7 8 9 10 11 12 13
    No. of bytes for RTP 12 12 12 12 12 12 12 12 12 12 12 12 12
    No. of bytes for VDP 8 8 8 8 8 8 8 8 8 8 8 8 8
    No. of bytes for IP 20 20 20 20 20 20 20 20 20 20 20 20 20
    No. of bytes for ETHERNET 14 14 14 14 14 14 14 14 14 14 14 14 14
    No. of bytes for voice 10 20 30 40 50 60 70 80 90 100 110 120 130
    Packet Size (bytes) 64 74 84 94 104 114 124 134 144 154 164 174 184
    Sampling at (ms) 10 20 30 40 50 60 70 80 90 100 110 120 130
    Bytes in seconds 6,400 3,700 2,800 2,350 2,080 1,900 1,771 1,675 1,600 1,540 1,491 1,450 1,415
    Link Speed (kbps) 51.20 29.60 22.40 18.80 16.64 15.20 14.17 13.40 12.80 12.32 11.93 11.60 11.32
    Required Bandwidth for 1 DSP (M) 2.458 1.421 1.075 0.902 0.799 0.730 0.680 0.643 0.614 0.591 0.573 0.557 0.544

    The link speed changes from 18.8 kbps to 14.17 kbps for 4 to 7 frames, the link speed only drops in the range of 1 to 2 kbps. The required bandwidth for 4 to 7 frames will between 0.68M to 0.90M

    The voice quality, with coding quality and latency control at the gateway, as well as latency and jitter control in the network will depends of no. of frames in the packet. ITU-T G.114 recommendation for end-to delay in a voice network should be 150ms.

    To ensure end-to-end QoS for voice traffic while making optimal use of network bandwidth, Manufacturer should offer a comprehensive set of QoS capabilities, will Lucent provides a set of software in this aspects.

    #33202 Reply
    Voip-Calculator.com
    Guest
    #33203 Reply
    Rommel
    Guest

    Your voip bandwidth calculator has the wrong values for G.723.1 The codec comes in 5.3k and 6.3k flavors.

    #33204 Reply
    Rommel
    Guest

    To clarify Alex’s message this is using a G.729 codec. At least that is what it looks like. Codec is needed in order to determine your bandwidth.
    G.114 also states that ONE way delay should be no longer than 150ms.

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