Author Topic: Learning Guide: What causes VoIP QoS problems?  (Read 887 times)

sabithppk

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Learning Guide: What causes VoIP QoS problems?
« on: July 16, 2014, 10:49:45 AM »
Learning Guide: What causes VoIP QoS problems?

sabithppk

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Re: Learning Guide: What causes VoIP QoS problems?
« Reply #1 on: July 17, 2014, 11:38:42 AM »

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We have come to measure quality of packetized voice service by the equivalent service offered by the switched digital network, sometimes called G.711 (Ref. 1) service. The user expects a quality of service (QoS) as good as he/she would get on a PSTN dial-up connection.

To achieve this goal, VoIP designers were faced with the following degradations:

    Mouth-to-ear delay;
    Impact of erred frames (packets);
    Lost frames (packets);
    Variation of packet arrival time, jitter buffering;
    Prioritizing VoIP traffic over regular Internet and data services;
    Talker echo;
    Distortion;
    Sufficient bit rate capacity on interconnecting transmission media;
    Voice coding algorithm standardization;
    Optimized standard packet payload size;
    Packet overhead; and
    Silence suppression.

santhoshidatasoft

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Re: Learning Guide: What causes VoIP QoS problems?
« Reply #2 on: July 18, 2014, 07:37:43 AM »
We have come to measure quality of packetized voice service by the equivalent service offered by the switched digital network, sometimes called G.711 service. The user expects a quality of service (QoS) as good as he/she would get on a PSTN dial-up connection.

To achieve this goal, VoIP designers were faced with the following degradations:

    Mouth-to-ear delay;
    Impact of erred frames (packets);
    Lost frames (packets);
    Variation of packet arrival time, jitter buffering;
    Prioritizing VoIP traffic over regular Internet and data services;
    Talker echo;
    Distortion;
    Sufficient bit rate capacity on interconnecting transmission media;
    Voice coding algorithm standardization;
    Optimized standard packet payload size;
    Packet overhead; and
    Silence suppression.