From: <dave.mustill at bt.com>
Date: 21 July 2008 17:10:15 BDT
To: <jon.peterson at neustar.biz>, <fluffy at cisco.com>,
<csp at csperkins.org>, <roni.even at polycom.co.il>,
<tom.taylor at rogers.com>
Cc: <pno at lists.oftel.gov.uk>, <alan.d.clark at telchemy.com>
Subject: Request for information on the status of RTCP HR
To:- RAI Area Directors - Jon Peterson (jon.peterson at neustar.biz),
Cullen Jennings (fluffy at cisco.com) -
Audio/Video Transport Working Group Chairs
Ref:- RTCP HR - High Resolution VoIP Metrics Report Blocks
Sirs,
NICC is the UK standards body developing NGN interconnect standards
for the UK. Wherever possible, NICC standards are based on
international standards and NICC profiles the international
standard for the UK environment.
NICC is developing a set of standards for NGN interconnect to
support voice services. As part of these standards, NICC has
produced and agreed a standard (ND1625) on NGN Interconnect RTP
Packet Transport Quality Monitoring. Hence, NICC has been tracking
the progress of the AVT formal work item, RTCP HR, as reflected in
contributions to draft-ietf-avt-rtcphr-03 relating to the
measurement of VoIP quality. NICC has agreed that ND1625 should
refer out to the IETF RTCP HR standard, but the agreed text of
ND1625 cannot be formally approved and published until the IETF
document reaches a more mature and stable state.
NICC understands that AVT work on RTCP HR has been stopped in
favour of a definition of a RTCP metric block that can not only be
used for voice but also for video. If this is the case, this logic
is understandable from a purely technical position but does not
reflect the demands with the industry where solutions for VoIP
market vastly outweigh those for video and are required now.
ND1625 is now on the critical path for NICC to complete its suite
of standards for NGN Interconnect. Hence we wish to make you aware
of the strong and urgent demand for a standard in this area. Whilst
the NICC preference is to use the IETF standard if it can be
speedily brought to RFC status, the demand for a standard in this
area will lead to the use of non-standard de facto industry
solutions in its absence.
We understand the MSF has recently made a request for information
regarding the status and intended progress on RTCP HR. The NICC
would also like to understand the answers to the questions posed by
the MSF. Therefore the NICC would be very grateful if the IETF AVT
working group would:-
comment of the status of the RTCP HR work,
comment if a generic RTCP metrics for VoIP and video is actively
being worked on, its level of contribution support and when any
output is likely to be made,
consider the reinstatement of work on RTCP HR if the generic
approach cannot be delivered within 6 months.
Regards,
Dave Mustill
(Secretary, NICC Technical Steering Group)
Performance & Interconnect Standards
BT Design, Chief Architect Office
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