Thursday, December 17, 2009

Voip Phones - Quality of Service

Voip Phones - Factors for Quality of Service (QoS)
QoS or quality of service function is of paramount importance in relation to the QoS experienced by end users. This is influenced by two key factors:

The voice quality end to end, determined by the successive processes of coding - decoding, and packet loss on the network.

The end to end delay, due to the successive processes of coding - decoding, packetization and "glued". Subsequent interactivity in the conversation, and therefore the QoS.

IP networks are networks of best-effort type and therefore offer no guarantee of QoS, but IP telephony applications if they need some sort of QoS guarantee in terms of delay, jitter and packet loss. In this regard there are two mechanisms for QoS signaling, namely IntServ and DiffServ. Both are "mechanisms" in the face of network.

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