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Alliance Releases QoS Guidelines |
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Written by Adam Gosling
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Tuesday, 04 December 2007 |
The Communications Alliance has released no one but two new industry guidelines designed to help operators meet
Quality of Service (QoS) performance objectives for VoIP services and
Internet Protocol (IP) networks.
Claiming a world first, the Alliance says the guidelines have been
aligned with and built on international recommendations. They were
however, developed by a working committee comprised of
representatives from the Australia's telecommunications industry and
Government regulatory
agencies and will provide a basis for the delivery of next generation
services such as
interactive voice or video to end users across different providers,
says the organisation.
"With
the growth of large VoIP deployments and the increase in IP telephony service
subscribers, the number of VoIP calls that cross multiple networks will
inevitably grow," explained Communications Alliance CEO Anne Hurley.
"Similarly, many telephony service providers are migrating to IP core
networks, and all-IP interfaces for the exchange of telephony traffic.
The
VoIP Guideline offers service providers an indicator of quality for VoIP
services and information on factors that determine conversational voice quality
on VoIP Services. The IP Guideline has been developed as a planning guide to
help operators meet QoS performance objectives.
"The next important step will
be the implementation and successful use of the guidelines by the industry. We
would then expect improvements to end user experiences, particularly when calls
traverse multiple networks," said Hurley.
The IP network guideline covers three traffic
classes:
- a
"best efforts" class (similar to current internet services),
- a
managed class for time critical services with low tolerance for
interruption (e.g. for applications such as interactive voice or video
that need a steady, continuing flow of data for the application to operate
well), and
- another
managed class for services that are still time critical but with slightly
less sensitivity to interruption (e.g. for applications such as
‘real time' or interactive data that need a short response
time but can tolerate some variance).
The VoIP guideline defines a number of
categories for voice services. It provides an indicator of voice service
quality and contains guidance on the influence of a number of factors such as:
- delay
(the time from mouth to ear),
- echo
(the amount of speech reflected back to the speaker),
- codec
choice (the method for converting speech into electrical signals and back
again) and
- loss
(the amount by which the electrical signal fades as it travels along a
line) to come up with this indicator.
Copies of the Guidelines are available for
service providers to download at: www.commsalliance.com.au
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