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| Selecting a VoIP Solution Phone System for Home and Business. |
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The VoIp Solution Workbook is a comprehensive guide to terms and definitions that
are commonly used in reference to understanding VoIP Solutions.
are commonly used in reference to understanding VoIP Solutions.
| Quality of Service (QoS) |
Quality of Service (QoS)
Quality of Service (QoS)
Quality of Service (QoS)
Quality of Service Some broadband connections may have less than desirable
quality. Where IP packets are lost or delayed at any point in the network
between VoIP users, there will be a momentary drop-out of voice. This is more
noticeable in highly congested networks and/or where there are long distances
and/or interworking between end points. Technology has improved the reliability
and voice quality over time and will continue to improve VoIP performance as
time goes on.
It has been suggested to rely on the packetized nature of media in VOIP
communications and transmit the stream of packets from the source phone to the
destination phone simultaneously across different routes (multi-path routing).
In such a way, the temporary failures have less impact on the communication
quality. In capillary routing it has been suggested to use at the packet level
Fountain codes or particularly raptor codes for transmitting extra redundant
packets making the communication more reliable.
A number of protocols have been defined to support the reporting of QoS/QoE for
VoIP calls. These include RTCP XR (RFC3611), SIP RTCP Summary Reports,
H.460.9Annex B (for H.323), H.248.30 and MGCP extensions. The RFC3611 VoIP
Metricsblock is generated by an IP phone or gateway during a live call and contains
information on packet loss rate, packet discard rate (due to jitter), packet
loss/discard burst metrics (burst length/density, gap length/density), network
delay, end system delay, signal / noise / echo level, MOS scores and R factors
and configuration information related to the jitter buffer.
RFC3611 VoIP metrics reports are exchanged between IP endpoints on an
occasional basis during a call, and an end of call message sent via SIP RTCP
Summary Report or one of the other signaling protocol extensions. RFC3611 VoIP
metrics reports are intended to support real time feedback related to QoS problems,
the exchange of information between the endpoints for improved call quality
calculation and a variety of other applications.
Attributes and Credits
The information and facts supplied on this subject
derive from http://en.wikipedia.org/wiki/Main_Page
quality. Where IP packets are lost or delayed at any point in the network
between VoIP users, there will be a momentary drop-out of voice. This is more
noticeable in highly congested networks and/or where there are long distances
and/or interworking between end points. Technology has improved the reliability
and voice quality over time and will continue to improve VoIP performance as
time goes on.
It has been suggested to rely on the packetized nature of media in VOIP
communications and transmit the stream of packets from the source phone to the
destination phone simultaneously across different routes (multi-path routing).
In such a way, the temporary failures have less impact on the communication
quality. In capillary routing it has been suggested to use at the packet level
Fountain codes or particularly raptor codes for transmitting extra redundant
packets making the communication more reliable.
A number of protocols have been defined to support the reporting of QoS/QoE for
VoIP calls. These include RTCP XR (RFC3611), SIP RTCP Summary Reports,
H.460.9Annex B (for H.323), H.248.30 and MGCP extensions. The RFC3611 VoIP
Metricsblock is generated by an IP phone or gateway during a live call and contains
information on packet loss rate, packet discard rate (due to jitter), packet
loss/discard burst metrics (burst length/density, gap length/density), network
delay, end system delay, signal / noise / echo level, MOS scores and R factors
and configuration information related to the jitter buffer.
RFC3611 VoIP metrics reports are exchanged between IP endpoints on an
occasional basis during a call, and an end of call message sent via SIP RTCP
Summary Report or one of the other signaling protocol extensions. RFC3611 VoIP
metrics reports are intended to support real time feedback related to QoS problems,
the exchange of information between the endpoints for improved call quality
calculation and a variety of other applications.
Attributes and Credits
The information and facts supplied on this subject
derive from http://en.wikipedia.org/wiki/Main_Page