Connection Analysis

MVLS01: Packet loss has been detected.

VoIP is real-time data in that it represents two or more parties in conversation using a telephone or mobile handset. If packets are lost, in either, direction then parts of the speech audio will be compromised. Obviously the best quality audio requires that all the VoIP packets are delivered. Packet loss is a measure of packets that simply do not arrive at the destination at all. Lost data can be caused by a number of different network events, for example, corruption of a data packet while in transit will render the packet unusable, or the data packet is intentionally dropped by a router device because of packet demand and congestion.

Unlike TCP traffic VoIP uses UDP. TCP (Transmission Control Protocol) is designed to recover lost data, after all it would be hard to do online banking if packets got lost or discarded. The decimal point might get lost and then major problems will likely ensue. TCP, as a protocol, is geared to the type of application that demands that all packets arrive for sure. The reason TCP does not get used for VoIP is that TCP recovery of lost data is expensive in time and the nature of voice is time critical and cannot afford delays for recovery. UDP, which is used for VoIP, is therefore a protocol that is one-way only, i.e. data only travels in one direction. If UDP packets gets lost they are lost for good.

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