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Versions: (draft-johnston-sipping-rtcp-summary) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 RFC 6035

SIPPING Working Group                                       A. Pendleton
Internet-Draft                                                    Nortel
Expires: July 4, 2006                                        A. Johnston
                                                                   Tello
                                                            H. Sinnreich
                                                                  Pulver
                                                                A. Clark
                                                   Telchemy Incorporated
                                                           February 2006


     Session Initiation Protocol Package for Voice Quality Reporting Event
                   draft-ietf-sipping-rtcp-summary-01

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
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   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on July 4, 2006.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document defines a SIP event package that enables the collection
   and reporting of metrics that measure the quality for Voice over
   Internet Protocol (VoIP) sessions.



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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  SIP Events Approach  . . . . . . . . . . . . . . . . . . . . .  3
   4.  Use of PUBLISH Method  . . . . . . . . . . . . . . . . . . . .  3
   5.  Event Package Formal Definition  . . . . . . . . . . . . . . .  4
     5.1.  Event Package Name . . . . . . . . . . . . . . . . . . . .  4
     5.2.  Event Package Parameters . . . . . . . . . . . . . . . . .  4
     5.3.  SUBSCRIBE Bodies . . . . . . . . . . . . . . . . . . . . .  4
     5.4.  Subscription Duration  . . . . . . . . . . . . . . . . . .  4
     5.5.  NOTIFY Bodies  . . . . . . . . . . . . . . . . . . . . . .  4
     5.6.  Voice Quality Event Syntax and Semantics . . . . . . . . .  5
     5.7.  Message Flow and Syntax Examples . . . . . . . . . . . . . 12
       5.7.1.  End of Session Report using PUBLISH  . . . . . . . . . 12
       5.7.2.  Alert Report using PUBLISH . . . . . . . . . . . . . . 14
       5.7.3.  End of Session Report using NOTIFY . . . . . . . . . . 16
       5.7.4.  Mid Session Threshold Violation using NOTIFY . . . . . 18
     5.8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . 21
       5.8.1.  SIP Event Package Registration . . . . . . . . . . . . 21
       5.8.2.  application/vq-rtcp-xr MIME Registration . . . . . . . 22
     5.9.  Security Considerations  . . . . . . . . . . . . . . . . . 22
     5.10. Contributors . . . . . . . . . . . . . . . . . . . . . . . 23
   6.  Normative References . . . . . . . . . . . . . . . . . . . . . 23
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24
   Intellectual Property and Copyright Statements . . . . . . . . . . 25



















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1.  Introduction

   This document defines a new SIP event package, vq-rtcpxr, and a new
   MIME type, application/vq-rtcpxr, that enable the collection and
   reporting of metrics that measure quality for RTP [3] sessions.  The
   definitions of the metrics used in the event package are based on
   RTCP Extended Reports [4] and RTCP [3].  Monitoring of voice quality
   is believed to be the highest priority for usage of this mechanism
   and as such, the metrics in the event package are largely tailored
   for voice quality measurement.  However, the event package defined
   herein is designed to be extensible.  The event package explicitly
   provides parameters for reporting both the local and remote versions
   of these statistics.  Note that in multi-party calls, multiple
   reports will need to be generated either one for each endpoint or one
   for each session.  Configuration of usage of the event package is not
   covered in this document.  The event package can be used either with
   the SUBSCRIBE/NOTIFY methods or the PUBLISH method.  Message flow
   examples for both mechanims are provided in this document.


2.  Terminology

   In this document, the key words "MUST", "MUST NOT", "REQUIRED",
   "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT
   RECOMMENDED", "MAY", and "OPTIONAL" are to be interpreted as
   described in BCP 14, RFC 2119 [1] and indicate requirement levels for
   compliant implementations.


3.  SIP Events Approach

   This document defines a new SIP events package [5].  The intended
   methods to use for this event are PUBLISH and SUBSCRIBE/NOTIFY.  A
   SIP UA can provide voice quality reports using either of these
   methods to an entity which can make the information available to
   other applications.


4.  Use of PUBLISH Method

   A SIP UA that supports this specification may send the service
   quality metric reports using the PUBLISH method.  An application
   wishing to access this performance data maintains a State Agent for
   the vq-rtcpxr event package.  The Request-URI of the PUBLISH method
   is set to the address of the resource for the VoIP application.  The
   PUBLISH message is sent to the normal default outbound proxy server
   of the SIP UA or could be sent to other interested parties.




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   The use of PUBLISH by this event is unique in that it does not
   require a soft or hard state to be maintained by either the Event
   Publication Agent (EPA) or the Event State Compositor (ESC).
   Futhermore the information that is presented by the vq-rtcpxr event
   in a PUBLISH request is not expected to have an expiration, rather,
   the information is associated with the timestamps in the event
   itself.  The primary intention of using PUBLISH for this event is
   reduction of transaction processing.

   A concern over the usage of the PUBLISH method is potential
   overloading of servers receiving the events, particularly in the
   threshold reporting model.  There are many approaches to solving this
   type of problem, but clearly the EPA's needs to adhere to some
   guidelines to reduce the probability of causing this overload
   condition.  Some suggested solutions are: a) limit sending of one
   threshold report per metric per session b) limit sending of one
   threshold report per session regardless of the metric c) limit
   sending a new threshold report to when a metric state has been
   sustained for a reasonable amount of time such as 20-30 seconds.


5.  Event Package Formal Definition

5.1.  Event Package Name

   This document defines a SIP Event Package as defined in RFC 3265 [2].
   The event-package token name for this package is:

   "vq-rtcpxr"

5.2.  Event Package Parameters

   No event package parameters are defined.

5.3.  SUBSCRIBE Bodies

   No SUBSCRIBE bodies are described by this specification.

5.4.  Subscription Duration

   Subscriptions to this event package MAY range from minutes to weeks.
   Subscriptions in hours or days are more typical and are RECOMMENDED.
   The default subscription duration for this event package is one hour.

5.5.  NOTIFY Bodies

   There are three notify bodies: a session report, an interval session
   report, and a alert report.



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   The session report is used for end of session reporting.  This can be
   generated when a voice media session terminates or when a media
   change occurs, such as a codec change or a session forks.  This
   report is intended to allow cumulative metric reporting.  The session
   reports will populate the metrics with values that are measured over
   the interval explicitly defined by the "start" and "stop" timestamps.

   The interval report is used for periodic or interval reporting.  This
   report is intended to capture short duration metric reporting.
   Interval reports will populate the metrics with values that are
   measured over the interval explicitly defined by the "start" and
   "stop" timestamps.

   The threshold report is used when voice quality degrades during a
   session.  The session report parameters are also included in the
   alert report to provide all of the necessary diagnostic information.
   Like the interval report, the metrics in the threshold reports will
   be populated with values that are measured over the interval
   explicitly defined by the "start" and "stop" timestamps.

   This specification defines a new MIME type application/vq-rtcpxr
   which is a text encoding of the RTCP and RTCP-XR statistics, along
   with some additional metrics and correlation information.

5.6.  Voice Quality Event Syntax and Semantics

   This section describes the syntax extensions required for event
   publication in SIP.  The formal syntax definitions described in this
   section are expressed in the Augmented BNF [6] format used in SIP [2],
   and contains references to elements defined therein.  Additionally,
   the definition of the timestamp format is provided in [7].  Note that
   most of the parameters are optional.  In practice, most
   implementations will send a subset of the parameters.  It is not the
   intention of this document to define what parameters may or may not
   be useful for monitoring the quality of a voice session, but to
   enable reporting of voice quality.  As such, the syntax allows the
   implementer to choose which metrics are most appropriate for their
   solution.  As there are no "invalid", "unknown", or "not applicable"
   values in the syntax, the intention is to exclude any parameters for
   which values are not available, not applicable, or unknown.
   Additionally, the authors recognize that implementers may need to add
   new parameter lines to the reports and new metrics to the existing
   parameter lines.  The extension tokens are intended to fulfill this
   need.


   VQReportEvent  =  AlertReport /  SessionReport / IntervalReport




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   SessionReport = "VQSessionReport" CLRF
                                   LocalMetrics [CLRF RemoteMetrics]
                                   [DialogID]

   IntervalReport = "VQIntervalReport" CLRF
                                   LocalMetrics [CLRF RemoteMetrics]
                                   [DialogID]

   LocalMetrics  = "LocalMetrics" COLON Metrics
   RemoteMetrics = "RemoteMetrics" COLON Metrics

   AlertReport   = "VQAlertReport" COLON
                   MetricType WSP Severity WSP Direction CLRF
                   "Metrics:" CLRF
                   Metrics
                   [CLRF "OtherDir Metrics:" CLRF Metrics]
                   [DialogID]


   Metrics = TimeStamps CLRF
           [SessionDescription CLRF]
           CallID CLRF
           LocalAddr CRLF
           RemoteAddr CRLF
           [JitterBuffer CRLF]
           [PacketLoss CRLF]
           [BurstGapLoss CLRF]
           [Delay CLRF]
           [Signal CLRF]
           [QualityEstimates CLRF]
           *[Extension CLRF]


   ; Timestamps are provided in Coordinated Universal Time (UTC)
   ; using the ABNF format provided in RFC3339,
   ;  "Date and Time on the Internet: Timestamps"
   ; These timestamps should reflect, as closely as
   ; possible, the actual time during  which the media session
   ; was running to enable correlation to events occurring
   ; in the network infrastructure and to accounting or billing
   ; records
   TimeStamps = "Timestamps" COLON StartTime WSP StopTime
   StartTime  = "START" EQUAL date-time
   StopTime   = "STOP" EQUAL date-time


   ; SessionDescription provides a shortened version of the
   ; session SDP but contains only the relevant parameters for



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   ; session quality reporting purposes
   SessionDescription  = "SessionDesc" COLON
           [PayloadType WSP]
           [PayloadDesc WSP]
           [SampleRate WSP]
           [FrameDuration WSP]
           [FrameOctets WSP]
           [FramesPerPacket WSP]
           [PacketsPerSecond WSP]
           [FmtpOptions WSP]
           [PacketLossConcealment WSP]
           [SilenceSuppressionState]
           *[WSP Extension]

   ; PayloadType provides the PT parameter used in the RTP packets
   ; i.e. the codec used for decoding received RTP packets
   ; It is recommended that IANA registered values are used
   ; where possible.
   PayloadType  = "PT" EQUAL (1*3DIGIT)

   ; PayloadDesc provides a text description of the codec
   ; It is recommended that IANA registered names are used
   ; where possible.
   PayloadDesc  = "PD" EQUAL word

   ; SampleRate provides the rate at which voice was sampled
   ; in the case of narrowband codecs, the value will typically be 8000
   SampleRate = "SR" EQUAL (1*5DIGIT)

   ; FrameDuration can be combined with the FramesPerPacket to determine
   ; the packetization rate; the units for this are milliseconds.
   FrameDuration = "FD" EQUAL (1*3DIGIT)

   ; FrameOctets provides the number of octets in each frame
   ; Used where FrameDuration is not available
   FrameOctets  = "FO" EQUAL (1*4DIGIT)

   ; FramesPerPacket provides the number of frames in each RTP packet
   FramesPerPacket = "FPP" EQUAL (1*2DIGIT)

   ; Packets per second provides the number of packets, including one or
   ; more frames within each, that are transmitted per second
   PacketsPerSecond = "PPS" EQUAL (1*5DIGIT)

   ; FMTP options from SDP.  Note that the parameter is deliniated
   ; by " " to avoid parsing issues in transitioning between SDP and
   ; SIP parsing
   FmtpOptions = "FMTP" EQUAL "word-plus"



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   ; PacketLossConcealment indicates whether a PLC algorithm was
   ; or is being used for the session.  The values follow the same
   ; numbering convention as RFC 3611.  For more details,
   ; please refer to RFC 3611, RTCP XR
   ; 0 - unspecified
   ; 1 - disabled
   ; 2 - enhanced
   ; 3 - standard
   PacketLossConcealment  = "PLC" EQUAL ("0" / "1" / "2" / "3")

   ; SilenceSuppressionState indicates whether silence suppression,
   ; also known as Voice Activity Detection (VAD) is enabled.
   SilenceSuppressionState  = "SSUP" EQUAL ("on" / "off")

   ; CallId provides the call id from the SIP header
   CallID  =  "CID" EQUAL Call-ID-Parm


   ; LocalAddr provides the IP address, port and ssrc for the
   ; session from the perspective of the endpoint/UA which is
   ; sending the report
   LocalAddr   = "LocalAddr" COLON IPAddress WSP Port WSP Ssrc

   ; RemoteAddr provides the IP address, port and ssrc for the
   ; session from the perspective of the peer of the endpoint/UA
   ; that is sending the report
   RemoteAddr  = "RemoteAddr" COLON IPAddress WSP Port WSP Ssrc

   IPAddress   = "IP" EQUAL IPv6address / IPv4address
   Port        = "PORT" EQUAL 1*DIGIT
   Ssrc        = "SSRC" EQUAL 1*8HEX

   JitterBuffer = "JitterBuffer" COLON
           [JitterBufferAdaptive WSP]
           [JitterBufferRate WSP]
           [JitterBufferNominal WSP]
           [JitterBufferMax WSP]
           [JitterBufferAbsMax]
           *[WSP Extension]

   ; JitterBufferAdaptive indicates whether the jitter buffer in the
   ; endpoint is adaptive, static, or unknown.
   ; The values follow the same numbering convention as RFC 3611.
   ; For more details, please refer to that document.
   ; 0 - unknown
   ; 1 - reserved
   ; 2 - non-adaptive
   ; 3 - adaptive



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   JitterBufferAdaptive  = "JBA" EQUAL ("0" / "1" / "2" / "3")

   ; JitterBuffer metric definitions are provided in RTCP XR, RFC 3611
   JitterBufferRate      = "JBR" EQUAL (1*2DIGIT) ;0-15
   JitterBufferNominal   = "JBN" EQUAL (1*5DIGIT) ;0-65535
   JitterBufferMax       = "JBM" EQUAL (1*5DIGIT) ;0-65535
   JitterBufferAbsMax    = "JBX" EQUAL (1*5DIGIT) ;0-65535

   ; PacketLoss metric definitions are provided in RTCP XR, RFC 3611
   PacketLoss = "PacketLoss" COLON
                             [NetworkPacketLossRate WSP]
                             [JitterBufferDiscardRate]
                             *[WSP Extension]

   NetworkPacketLossRate
    = "NLR" EQUAL (1*3(DIGIT) ["." 1*2(DIGIT)]) ;percentage
   JitterBufferDiscardRate
    = "JDR" EQUAL (1*3(DIGIT) ["." 1*2(DIGIT)]) ;percentage


   ; BurstGapLoss metric definitions are provided in RTCP XR, RFC 3611
   BurstGapLoss = "BurstGapLoss" COLON
           [BurstLossDensity WSP]
           [BurstDuration WSP]
           [GapLossDensity WSP]
           [GapDuration WSP]
           [MinimumGapThreshold]
           *[WSP Extension]

   BurstLossDensity
    = "BLD" EQUAL (1*3(DIGIT) ["." 1*2(DIGIT)]) ;percentage
   BurstDuration
    = "BD" EQUAL (1*8DIGIT) ;0-3,600,000 -- milliseconds
   GapLossDensity
    = "GLD" EQUAL (1*3(DIGIT) ["." 1*2(DIGIT)]) ;percentage
   GapDuration
    = "GD" EQUAL (1*8DIGIT) ;0-3,600,000 -- milliseconds
   MinimumGapThreshold
    = "GMIN" EQUAL (1*3DIGIT) ;1-255


   Delay = "Delay" COLON
           [RoundTripDelay WSP]
           [EndSystemDelay WSP]
           [OneWayDelay WSP]
           [InterarrivalJitter WSP]
           [MeanAbsoluteJitter]
           *[WSP Extension]



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   ; RoundTripDelay is recommended to be measured as defined in
   ; RTCP, RFC 3550.
   RoundTripDelay     = "RTD" EQUAL (1*5DIGIT) ;0-65535

   ; EndSystemDelay metric is defined in RTCP XR, RFC 3611
   EndSystemDelay     = "ESD" EQUAL (1*5DIGIT) ;0-65535

   ; OneWayDelay is recommended to be measured according to
   ; recommendations provided by the IPPM working group but may be
   ; based on alternative measurement recommendations
   OneWayDelay        = "OWD" EQUAL (1*5DIGIT) ;0-65535

   ; Interarrival Jitter is recommended to be measured as defined
   ; in RTCP, RFC 3550, but may be based on alternatives
   InterarrivalJitter = "IAJ" EQUAL (1*5DIGIT) ;0-65535

   ; Mean Absolute Jitter is recommended to be measured as defined
   ; by ITU-T G.1020 where it is known as MAPDV
   MeanAbsoluteJitter = "MAJ" EQUAL (1*5DIGIT)

   ; Signal metrics definitions are provided in RTCP XR, RFC 3611
   Signal = "Signal" COLON
           [SignalLevel WSP]
           [NoiseLevel WSP]
           [ResidualEchoReturnLoss]
           *[WSP Extension]

   ; SignalLevel will normally be a positive value
   ; the absence of the negative sign indicates a positive value
   ; where the signal level is negative, the sign must be included
   SignalLevel = "SL" EQUAL (["-"] 1*2DIGIT)

   ; NoiseLevel will normally be negative but to align with the
   ; the encoding of SignalLevel, the sign must be explicitly included
   ; again, the absence of a sign indicates a positive value
   NoiseLevel  = "NL" EQUAL (["-"] 1*2DIGIT)

   ResidualEchoReturnLoss = "RERL" EQUAL (1*3DIGIT)


   ; Voice Quality estimation metrics
   ; The definition of these metrics are provided in RTCP XR and
   ; the new High Resolution proposal, RTCP HD.

   ; Each quality estmiate has an optional associated algorithm.
   ; These fields permit the implementation to use a variety
   ; of different calculation methods for each type of metric
   QualityEstimates  = "QualityEst" COLON



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           [ListeningQualityR WSP]
           [RLQEstAlg WSP]
           [ConversationalQualityR WSP]
           [RCQEstAlg WSP]
           [ExternalR-In WSP]
           [ExtRInEstAlg WSP]
           [ExternalR-Out WSP]
           [ExtROutEstAlg WSP]
           [MOS-LQ WSP]
           [MOSLQEstAlg WSP]
           [MOS-CQ WSP]
           [MOSCQEstAlg WSP]
           [QoEEstAlg]
           *[WSP Extension]

   ListeningQualityR = "RLQ" EQUAL (1*3DIGIT) ; 0 - 120
   RLQEstAlg = "RLQEstAlg" EQUAL word ; "PESQ", "G.107", or other

   ConversationalQualityR = "RCQ" EQUAL *1*3DIGIT) ; 0 - 120
   RCQEstAlg = "RCQEstAlg" EQUAL word ; "PESQ", "G.107", or other

   ; ExternalR-In is measured by the local endpoint for incoming
   ; connection on "other" side of this endpoint
   ;   e.g. PhoneA <---> Bridge <----> Phone B
   ;   ListeningQualityR = quality for PhoneA ----> Bridge path
   ;   ExternalR-In = quality for Bridge <---- PhoneB path

   ExternalR-In = "EXTRI" EQUAL (1*3DIGIT) ; 0 - 120
   ExtRInEstAlg = "ExtRIEstAlg" EQUAL word ; "PESQ", "G.107", or other

   ; ExternalR-Out is copied from RTCP XR message received from the
   ; remote endpoint on "other" side of this endpoint
   ;   e.g. PhoneA <---> Bridge <----> Phone B
   ;   ExternalR-Out = quality for Bridge -----> PhoneB path

   ExternalR-Out = "EXTRO" EQUAL (1*3DIGIT) ; 0 - 120
   ExtRInEstAlg = "ExtROEstAlg" EQUAL word ; "PESQ", "G.107", or other

   MOS-LQ = "MOSLQ" EQUAL (DIGIT ["." 1*2DIGIT]) ; 0.0 - 4.9
   MOSLQEstAlg = "MOSLQEstAlg" EQUAL word ; "PESQ", "G.107", or other

   MOS-CQ = "MOSCQ" EQUAL (DIGIT ["." 1*2DIGIT]  ; 0.0 - 4.9
   MOSCQEstAlg = "MOSCQEstAlg" EQUAL word ; "PESQ", "G.107", or other

   ; alternative to the separate estimation algorithms
   ; for use when the same algorithm is used for all measurements
   QoEEstAlg = "QoEEstAlg'




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   DialogID  = "DialogID" COLON callid *(SEMI did-parm)
   did-parm  = to-tag / from-tag / generic-param
   callid    =  Call-ID-Parm
   to-tag    = "to-tag" EQUAL token
   from-tag  = "from-tag" EQUAL token

   ; MetricType provides the metric on which a notification of
   ; threshold violation was based.  The more commonly used metrics
   ; for alerting purposes are included here explicitly and the
   ; token parameter allows for extension
   MetricType = "Type" EQUAL "RLQ" / "RCQ" / "EXTR" /
           "MOSLQ" / "MOSCQ" /
           "BD" / "NLR" / "JDR" /
           "RTD" / "ESD" / "IAD" /
           "RERL" / Extension

   Direction = "Dir" EQUAL "local" / "remote"

   Severity  = "Severity" EQUAL "Warning" / "Critical" /
           "Clear"

   Call-ID-Parm =  word [ "@" word ]

   Extension = word-plus

   word  =  1*(alphanum / "-" / "." / "!" / "%" / "*" /
           "_" / "+" / "`" / "'" / "~" /
           "(" / ")" / "<" / ">" /
           ":" / "\" / DQUOTE /
           "/" / "[" / "]" / "?" /


   word-plus =  1*(alphanum /  "-"  /  "."  /  "!"  / "%" / "*" /
           "_"  /  "+"  /  "`"  /  "'"  /  "~"  /
           "("  /  ")"  /  "<"  /  ">"  /  ":"  /
           "\"  /  "/"  /  "["  /  "]"  /  "?"  /
           "{"  /  "}"  /  "="  /  " ")


5.7.  Message Flow and Syntax Examples

   This section shows a number of message flow examples showing how the
   event package works.

5.7.1.  End of Session Report using PUBLISH

   Alice            Proxy/Registrar        Collector             Bob
   |                    |                    |                    |



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   |                    |                    |                    |
   | REGISTER Allow-Event:vq-rtcpxr  F1      |                    |
   |------------------->|                    |                    |
   |      200 OK F2     |                    |                    |
   |<-------------------|                    |                    |
   |      INVITE F3     |                    |                    |
   |------------------->|                    |                    |
   |                    |      INVITE F4     |                    |
   |                    |---------------------------------------->|
   |                    |      200 OK F5     |                    |
   |                    |<----------------------------------------|
   |     200 OK F6      |                    |                    |
   |<-------------------|                    |                    |
   |        ACK F7      |                    |                    |
   |------------------->|                    |                    |
   |                    |      ACK F8        |                    |
   |                    |---------------------------------------->|
   |        RTP         |                    |                    |
   |<============================================================>|
   |        RTCP        |                    |                    |
   |<============================================================>|
   |                    |                    |                    |
   |    BYE F9          |                    |                    |
   |------------------->|      BYE F10       |                    |
   |                    |---------------------------------------->|
   |                    |     200 OK F11     |                    |
   |                    |<----------------------------------------|
   |     200 OK F12     |                    |                    |
   |<-------------------|                    |                    |
   |  PUBLISH Event:vq-rtcpxr F13            |                    |
   |------------------->|                    |                    |
   |                    | PUBLISH Event:vq-rtcpxr F14             |
   |                    |------------------->|                    |
   |                    |     200 OK F15     |                    |
   |                    |<-------------------|                    |
   |     200 OK F16     |                    |                    |
   |<-------------------|                    |                    |


   Figure 1. End of session report sent after session termination.


   In the message flow depicted in Figure 1, the following message
   is sent in F13.

   PUBLISH sip:collector@example.org SIP/2.0
   Via: SIP/2.0/UDP pc22.example.org;branch=z9hG4bK3343d7
   Max-Forwards: 70



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   To: <sip:proxy@example.org>
   From: Alice <sip:alice@example.org>;tag=a3343df32
   Call-ID: 1890463548@alice.example.org
   CSeq: 4331 PUBLISH
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER,
   SUBSCRIBE, NOTIFY
   Event: vq-rtcpxr
   Accept: application/sdp, message/sipfrag
   Content-Type: application/vq-rtcpxr
   Content-Length: ...

   VQSessionReport
   LocalMetrics:
   TimeStamps:START=2004-10-10T18:23:43Z STOP=2004-10-01T18:26:02Z
   SessionDesc:PT=18 PD=G729 SR=8000 FD=20 FO=20 FPP=2 PPS=50
                   FMTP="annexb=no" PLC=3 SSUP=on
   CallID:1890463548@alice.example.org
   LocalAddr:IP=10.10.1.100 PORT=5000 SSRC=2468abcd
   RemoteAddr:IP=11.1.1.150 PORT=5002 SSRC=1357efff
   JitterBuffer:JBA=3 JBR=2 JBN=40 JBM=80 JBX=120
   PacketLoss:NLR=5.0 JDR=2.0
   BurstGapLoss:BLD=0 BD=0 GLD=2.0 GD=500 GMIN=16
   Delay:RTD=200 ESD=140 IAJ=2 OWD=100
   Signal:SL=2 NL=-10 RERL=14
   QualityEst:RLQ=90 RCQ=85 EXTRI=90 MOSLQ=3.4 MOSCQ=3.3 QoEEstAlg=AlgX
   RemoteMetrics:
   TimeStamps:START=2004-10-10T18:23:43Z STOP=2004-10-01T18:26:02Z
   SessionDesc:PT=18 PD=G729 SR=8000 FD=20 FO=20 FPP=2 PPS=50
                   FMTP="annexb=no" PLC=3 SSUP=on
   CallID:1890463548@alice.example.org
   LocalAddr:IP=11.1.1.150 PORT=5002 SSRC=1357efff
   RemoteAddr:IP=10.10.1.100 PORT=5000 SSRC=2468abcd
   JitterBuffer:JBA=3 JBR=2 JBN=40 JBM=80 JBX=120
   PacketLoss:NLR=5.0 JDR=2.0
   BurstGapLoss:BLD=0 BD=0 GLD=2.0 GD=500 GMIN=16
   Delay:RTD=200 ESD=140 IAJ=2 OWD=100
   Signal:SL=2 NL=-10 RERL=0
   QualityEst:RLQ=90 RCQ=85 MOSLQ=3.4 MOSCQ=3.3 QoEEstAlg=AlgX
   DialogID:1890463548@alice.example.org;to-tag=8472761;
                   from-tag=9123dh311

5.7.2.  Alert Report using PUBLISH


   Alice            Proxy/Registrar        Collector             Bob
   |                    |                    |                    |
   |      INVITE F1     |                    |                    |
   |------------------->|                    |                    |



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   |                    |      INVITE F2     |                    |
   |                    |---------------------------------------->|
   |                    |      200 OK F3     |                    |
   |                    |<----------------------------------------|
   |     200 OK F4      |                    |                    |
   |<-------------------|                    |                    |
   |        ACK F5      |                    |                    |
   |------------------->|                    |                    |
   |                    |      ACK F6        |                    |
   |                    |---------------------------------------->|
   |        RTP         |                    |                    |
   |<============================================================>|
   |        RTCP        |                    |                    |
   |<============================================================>|
   |  PUBLISH Event:vq-rtcpxr F7             |                    |
   |------------------->|                    |                    |
   |                    | PUBLISH Event:vq-rtcpxr F8              |
   |                    |------------------->|                    |
   |                    |     200 OK F9      |                    |
   |                    |<-------------------|                    |
   |     200 OK F10     |                    |                    |
   |<-------------------|                    |                    |
   |                    |                    |                    |
   |      BYE F12       |                    |                    |
   |------------------->|      BYE F13       |                    |
   |                    |---------------------------------------->|
   |                    |     200 OK F14     |                    |
   |                    |<----------------------------------------|
   |     200 OK F15     |                    |                    |
   |<-------------------|                    |                    |


   Figure 2. Alert report message flow

   This alert indicates that the quality of the call in progress,
   as measured by the Listening Quality R metric, has degraded to an
   unacceptable level.  For futher troubleshooting of the problem, all
   metrics are populated, including the remote values obtained
   via RTCP XR (RFC 3611) in the endpoints.

   In the message flow depicted in Figure 2, the following message
   is sent in F7:

   PUBLISH sip:collector@example.org SIP/2.0
   Via: SIP/2.0/UDP pc22.example.org;branch=z9hG4bK3343d7
   Max-Forwards: 70
   To: <sip:collector@example.org>
   From: Alice <sip:alice@example.org>;tag=a3343df32



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   Call-ID: 1890463548@alice.example.org
   CSeq: 4321 PUBLISH
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER,
   SUBSCRIBE, NOTIFY
   Event: vq-rtcpxr
   Accept: application/sdp, message/sipfrag
   Content-Type: application/vq-rtcpxr
   Content-Length: ...

   VQAlertReport: Type=RLQ Severity=Warning Dir=local
   Metrics:
   TimeStamps:START=2004-10-10T18:23:43Z STOP=2004-10-01T18:26:02Z
   SessionDesc:PT=0 PD=PCMU SR=8000 FD=20 FO=160 FPP=1 PPS=50
                   PLC=3 SSUP=on
   CallID:1890463548@alice.example.org
   LocalAddr:IP=10.10.1.100 PORT=5000 SSRC=2a4b6c8d
   RemoteAddr:IP=11.1.1.150 PORT=5002 SSRC=9f7e5d3c
   JitterBuffer:JBA=3 JBR=2 JBN=40 JBM=80 JBX=120
   PacketLoss:NLR=5.0 JDR=2.0
   BurstGapLoss:BLD=0 BD=0 GLD=2.0 GD=500 GMIN=16
   Delay:RTD=200 ESD=140 IAJ=2 OWD=100
   Signal:SL=2 NL=-10 RERL=14
   QualityEst:RLQ=90 RCQ=85 EXTR=90 MOSLQ=3.4 MOSCQ=3.3 QoEEstAlg=AlgX
   OtherDir Metrics:
   TimeStamps:START=2004-10-10T18:23:43Z STOP=2004-10-01T18:26:02Z
   SessionDesc:PT=0 PD=PCMU SR=8000 FD=20 FO=160 FPP=1 PPS=50
                   PLC=3 SSUP=on
   CallID:1890463548@alice.example.rog
   LocalAddr:IP=11.1.1.150 PORT=5002 SSRC=9f7e5d3c
   RemoteAddr:IP=10.10.1.100 PORT=5000 SSRC=2a4b6c8d
   JitterBuffer:JBA=3 JBR=2 JBN=40 JBM=80 JBX=120
   PacketLoss:NLR=5.0 JDR=2.0
   BurstGapLoss:BLD=0 BD=0 GLD=2.0 GD=500 GMIN=16
   Delay:RTD=200 ESD=140 IAJ=2 OWD=100
   Signal:SL=2 NL=-10 RERL=0
   QualityEst:RLQ=90 RCQ=85 EXTRI=90 MOSLQ=3.4 MOSCQ=3.3 QoEEstAlg=AlgX
   DialogID:1890463548@alice.example.org;to-tag=8472761;
           from-tag=9123dh3111


5.7.3.  End of Session Report using NOTIFY

   Alice            Proxy/Registrar        Collector             Bob
   |                    |                    |                    |
   |                    |                    |                    |
   | REGISTER Allow-Event:vq-rtcpxr F1       |                    |
   |------------------->|                    |                    |
   |      200 OK F2     |                    |                    |



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   |<-------------------|                    |                    |
   |                    |  SUBSCRIBE Event:vq-rtcpxr F3           |
   |                    |<-------------------|                    |
   | SUBSCRIBE Event:vq-rtcpxr F4            |                    |
   |<-------------------|                    |                    |
   |     200 OK F5      |                    |                    |
   |------------------->|                    |                    |
   |                    |   200 OK F6        |                    |
   |                    |------------------->|                    |
   |      INVITE F7     |                    |                    |
   |------------------->|                    |                    |
   |                    |      INVITE F8     |                    |
   |                    |---------------------------------------->|
   |                    |      200 OK F9     |                    |
   |                    |<----------------------------------------|
   |     200 OK F10     |                    |                    |
   |<-------------------|                    |                    |
   |        ACK F11     |                    |                    |
   |------------------->|                    |                    |
   |                    |      ACK F12       |                    |
   |                    |---------------------------------------->|
   |        RTP         |                    |                    |
   |<============================================================>|
   |        RTCP, RTCP XR                    |                    |
   |<============================================================>|
   |                    |                    |                    |
   |    BYE F13         |                    |                    |
   |------------------->|      BYE F14       |                    |
   |                    |---------------------------------------->|
   |                    |     200 OK F15     |                    |
   |                    |<----------------------------------------|
   |     200 OK F16     |                    |                    |
   |<-------------------|                    |                    |
   |  NOTIFY Event:vq-rtcpxr F17             |                    |
   |------------------->|                    |                    |
   |                    | NOTIFY Event:vq-rtcpxr F18              |
   |                    |------------------->|                    |
   |                    |     200 OK F19     |                    |
   |                    |<-------------------|                    |
   |     200 OK F20     |                    |                    |
   |<-------------------|                    |                    |

   Figure 3. Summary report with NOTIFY sent after session termination.

   In the call flow depicted in Figure 3, the following message format
   is sent in F17:

   NOTIFY sip:collector@example.org SIP/2.0



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   Via: SIP/2.0/UDP pc22.example.org;branch=z9hG4bK3343d7
   Max-Forwards: 70
   To: <sip:collector@example.org>;tag=43524545
   From: Alice <sip:alice@example.org>;tag=a3343df32
   Call-ID: 1890463548@alice.example.org
   CSeq: 4321 NOTIFY
   Contact: <sip:alice@pc22.example.org>
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER,
   SUBSCRIBE, NOTIFY
   Event: vq-rtcpxr
   Accept: application/sdp, message/sipfrag
   Subscription-State: active;expires=3600
   Content-Type: application/vq-rtcpxr
   Content-Length: ...

   VQSessionReport
   LocalMetrics:
   TimeStamps:START=2004-10-10T18:23:43Z STOP=2004-10-01T18:26:02Z
   SessionDesc:PT=0 PD=PCMU SR=8000 FD=20 FO=160 FPP=1 PPS=50
                   PLC=3 SSUP=on
   CallID:1890463548@alice.example.org
   LocalAddr:IP=10.10.1.100 PORT=5000 SSRC=1a3b5c7d
   RemoteAddr:IP=11.1.1.150 PORT=5002 SSRC=2468abcd
   JitterBuffer:JBA=3 JBR=2 JBN=40 JBM=80 JBX=120
   PacketLoss:NLR=5.0 JDR=2.0
   BurstGapLoss:BLD=0 BD=0 GLD=2.0 GD=500 GMIN=16
   Delay:RTD=200 ESD=140 IAJ=2 OWD=100
   Signal:SL=2 NL=-10 RERL=14
   QualityEst:RLQ=90 RCQ=85 EXTRI=90 MOSLQ=3.4 MOSCQ=3.3 QoEEstAlg=AlgX
   RemoteMetrics:
   TimeStamps:START=2004-10-10T18:23:43Z STOP=2004-10-01T18:26:02Z
   SessionDesc:PT=0 PD=PCMU SR=8000 FD=20 FO=160 FPP=1 PPS=50
                   PLC=3 SSUP=on
   CallID:1890463548@alice.example.org
   LocalAddr:IP=11.1.1.150 PORT=5002 SSRC=2468abcd
   RemoteAddr:IP=10.10.1.100 PORT=5000 SSRC=1a3b5c7d
   JitterBuffer:JBA=3 JBR=2 JBN=40 JBM=80 JBX=120
   PacketLoss:NLR=5.0 JDR=2.0
   BurstGapLoss:BLD=0 BD=0 GLD=2.0 GD=500 GMIN=16
   Delay:RTD=200 ESD=140 IAJ=2 OWD=100
   Signal:SL=2 NL=-10 RERL=0
   QualityEst:RLQ=90 RCQ=85 EXTRI=90 MOSLQ=3.4 MOSCQ=3.3 QoEEstAlg=AlgX
   DialogID:1890463548@alice.example.org;to-tag=8472761;
           from-tag=9123dh311


5.7.4.  Mid Session Threshold Violation using NOTIFY




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   Alice            Proxy/Registrar        Collector             Bob
   |                    |                    |                    |
   |                    |                    |                    |
   | REGISTER Allow-Event:vq-rtcpxr F1       |                    |
   |------------------->|                    |                    |
   |      200 OK F2     |                    |                    |
   |<-------------------|                    |                    |
   |                    |  SUBSCRIBE Event:vq-rtcpxr F3           |
   |                    |<-------------------|                    |
   | SUBSCRIBE Event:vq-rtcpxr F4            |                    |
   |<-------------------|                    |                    |
   |     200 OK F5      |                    |                    |
   |------------------->|                    |                    |
   |                    |   200 OK F6        |                    |
   |                    |------------------->|                    |
   |      INVITE F7     |                    |                    |
   |------------------->|                    |                    |
   |                    |      INVITE F8     |                    |
   |                    |---------------------------------------->|
   |                    |      200 OK F9     |                    |
   |                    |<----------------------------------------|
   |     200 OK F10     |                    |                    |
   |<-------------------|                    |                    |
   |        ACK F11     |                    |                    |
   |------------------->|                    |                    |
   |                    |      ACK F12       |                    |
   |                    |---------------------------------------->|
   |        RTP         |                    |                    |
   |<============================================================>|
   |        RTCP, RTCP XR                    |                    |
   |<============================================================>|
   |  NOTIFY Event:vq-rtcpxr F17             |                    |
   |------------------->|                    |                    |
   |                    | NOTIFY Event:vq-rtcpxr F18              |
   |                    |------------------->|                    |
   |                    |     200 OK F19     |                    |
   |                    |<-------------------|                    |
   |     200 OK F20     |                    |                    |
   |<-------------------|                    |                    |
   |                    |                    |                    |
   |    BYE F13         |                    |                    |
   |------------------->|      BYE F14       |                    |
   |                    |---------------------------------------->|
   |                    |     200 OK F15     |                    |
   |                    |<----------------------------------------|
   |     200 OK F16     |                    |                    |
   |<-------------------|                    |                    |
   |  NOTIFY Event:vq-rtcpxr F17             |                    |



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   |------------------->|                    |                    |
   |                    | NOTIFY Event:vq-rtcpxr F18              |
   |                    |------------------->|                    |
   |                    |     200 OK F19     |                    |
   |                    |<-------------------|                    |
   |     200 OK F20     |                    |                    |
   |<-------------------|                    |                    |

   Figure 4. Summary report sent during session with threshold report.

   This alert indicates that the quality of the call in progress, based
   on Listening Quality transmission rating R , has degraded to an
   unacceptable level.  For futher troubleshooting of the problem, all
   metrics are populated, including the remote values obtained via
   RTCP XR [4].

   In the call flow depicted in Figure 4, the following message format
   is sent in F17:

   NOTIFY sip:collector@example.org SIP/2.0
   Via: SIP/2.0/UDP pc22.example.org;branch=z9hG4bK3343d7
   Max-Forwards: 70
   To: <sip:collector@example.org>
   From: Alice <sip:alice@example.org>;tag=a3343df32
   Call-ID: 1890463548@alice.example.org
   CSeq: 4321 PUBLISH
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER,
   SUBSCRIBE, NOTIFY
   Event: vq-rtcpxr
   Accept: application/sdp, message/sipfrag
   Content-Type: application/vq-rtcpxr
   Content-Length: ...

   VQAlertReport: Type=RLQ Severity=Warning Dir=local
   Metrics:
   TimeStamps:START=2004-10-10T18:23:43Z STOP=2004-10-01T18:26:02Z
   SessionDesc:PT=0 PD=PCMU SR=8000 FD=20 FO=160 FPP=1 PPS=50
           PLC=3 SSUP=on
   CallID:1890463548@alice.example.org
   LocalAddr:IP=10.10.1.100 PORT=5000 SSRC=1a3b5c7d
   RemoteAddr:IP=11.1.1.150 PORT=5002 SSRC=2468abcd
   JitterBuffer:JBA=3 JBR=2 JBN=40 JBM=80 JBX=120
   PacketLoss:NLR=5.0 JDR=2.0
   BurstGapLoss:BLD=0 BD=0 GLD=2.0 GD=500 GMIN=16
   Delay:RTD=200 ESD=140 IAJ=2 OWD=100
   Signal:SL=2 NL=-10 RERL=14
   QualityEst:RLQ=90 RCQ=85 EXTR=90 MOSLQ=3.4 MOSCQ=3.3 QoEEstAlg=AlgX
   OtherDir Metrics:



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   TimeStamps:START=2004-10-10T18:23:43Z STOP=2004-10-01T18:26:02Z
   SessionDesc:PT=0 PD=PCMU SR=8000 FD=20 FO=160 FPP=1 PPS=50
                   PLC=3 SSUP=on
   CallID:1890463548@alice.example.org
   LocalAddr:IP=11.1.1.150 PORT=5002 SSRC=2468abcd
   RemoteAddr:IP=10.10.1.100 PORT=5000 SSRC=1a3b5c7d
   JitterBuffer:JBA=3 JBR=2 JBN=40 JBM=80 JBX=120
   PacketLoss:NLR=5.0 JDR=2.0
   BurstGapLoss:BLD=0 BD=0 GLD=2.0 GD=500 GMIN=10
   Delay:RTD=200 ESD=140 IAJ=2 OWD=100
   Signal:SL=2 NL=-10 RERL=0
   QualityEst:RLQ=90 RCQ=85 EXTRI=90 MOSLQ=3.4 MOSCQ=3.3 QoEEstAlg=AlgX
   DialogID:1890463548@alice.example.org;to-tag=8472761;
           from-tag=9123dh31111


5.8.  IANA Considerations

   This document registers a new SIP Event Package and a new MIME type.

5.8.1.  SIP Event Package Registration

      Package name: vq-rtcpxr

      Type: package

      Contact: Amy Pendleton <aspen@nortel.com>

      Published Specification: This document






















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5.8.2.  application/vq-rtcp-xr MIME Registration

      MIME media type name: application

      MIME subtype name: vq-rtcpxr

      Mandatory parameters: none

      Optional parameters: none

      Encoding considerations: text

      Security considerations: See next section.

      Interoperability considerations: none.

      Published specification: This document.


      Applications which use this media type: This document type is
           being used in notifications of VoIP quality reports.

      Additional Information:

           Magic Number: None

           File Extension: None

           Macintosh file type code: "TEXT"

      Personal and email address for further information: Amy Pendleton
        <aspen@nortel.com>

      Intended usage: COMMON

      Author/Change controller: The IETF.

5.9.  Security Considerations

   RTCP reports can contain sensitive information since they can provide
   information about the nature and duration of a session established
   between two or more endpoints.  As a result, any third party wishing
   to obtain this information SHOULD be properly authenticated by the
   SIP UA using standard SIP mechanisms and according to the
   recommendations in [5].  Additionally the event content MAY be
   encrypted to ensure confidentiality; the mechanisms for providing
   confidentiality are detailed in [2].






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5.10.  Contributors

   The authors would like to thank Rajesh Kumar, Dave Oran and Tom
   Redman for their discussions.

6.  Normative References

   [1]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", BCP 14, RFC 2119, March 1997.

   [2]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A.,
        Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP:
        Session Initiation Protocol", RFC 3261, June 2002.

   [3]  Schulzrinne, H., Casner, S., Frederick, R., and V. Jacobson,
        "RTP: A Transport Protocol for Real-Time Applications", STD 64,
        RFC 3550, July 2003.

   [4]  Friedman, T., Caceres, R., and A. Clark, "RTP Control Protocol
        Extended Reports (RTCP XR)", RFC 3611, November 2003.

   [5]  Huitema, C., "Real Time Control Protocol (RTCP) attribute in
        Session Description Protocol (SDP)", RFC 3605, October 2003.

   [5]  Roach, A., "Session Initiation Protocol (SIP)-Specific Event
        Notification", RFC 3265, June 2002.

   [6]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
        Specifications: ABNF", RFC 2234, November 1997.

   [7]  Klyne, G. and C. Newman, "Date and Time on the Internet:
        Timestamps", RFC 3339, July 2002.





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Authors' Addresses

   Amy Pendleton
   Nortel
   2380 Performance Drive
   Richardson, TX  75081

   Email: aspen@nortel.com


   Alan Johnston
   Tello
   100 South 4th Street
   St. Louis, MO  63104

   Email: alan.johnston@sipstation.com


   Henry Sinnreich
   Pulver
   115 Broadhollow Drive, Suite 250
   Melville, NY 11747, NY  11747

   Email: henry@pulver.com


   Alan Clark
   Telchemy Incorporated
   3360 Martins Farm Road, Suite 200
   Suwanee, GA  30024

   Email: alan@telchemy.com



















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Intellectual Property Statement

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   this document or the extent to which any license under such rights
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   found in BCP 78 and BCP 79.

   Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
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   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at
   ietf-ipr@ietf.org.


Disclaimer of Validity

   This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
   ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
   INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
   INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


Copyright Statement

   Copyright (C) The Internet Society (2006).  This document is subject
   to the rights, licenses and restrictions contained in BCP 78, and
   except as set forth therein, the authors retain all their rights.


Acknowledgment

   Funding for the RFC Editor function is currently provided by the
   Internet Society.




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