Network Working Group Magnus Westerlund
INTERNET-DRAFT Per Frojdh
Expires: September 2006 Ericsson
March 6, 2006
SDP and RTSP extensions defined for 3GPP Packet-switched Streaming
Service and Multimedia Broadcast/Multicast Service
<draft-westerlund-mmusic-3gpp-sdp-rtsp-03.txt>
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Abstract
The Packet-switched Streaming Service (PSS) and the Multimedia
Broadcast/Multicast Service (MBMS) defined by 3GPP use SDP and RTSP
with some extensions. This document provides information about these
extensions and registers the RTSP and SDP extensions with IANA.
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TABLE OF CONTENTS
1. Definitions..................................................3
1.1. Glossary.................................................3
2. Introduction.................................................3
3. PSS SDP Extensions...........................................4
3.1. Video Buffering attributes...............................4
3.2. Video Frame Size attribute...............................4
3.3. Integrity Protection Configuration Attributes............5
3.4. The Alternative Attributes...............................5
3.5. Adaptation Attribute.....................................5
3.6. Quality of Experience Attribute..........................6
3.7. Asset Information Attribute..............................6
4. MBMS SDP Extensions..........................................6
4.1. MBMS Bearer Mode Declaration Attribute...................6
4.2. FEC Flow ID Attribute....................................6
4.3. MBMS Repair Attribute....................................6
4.4. SDP Protocol Identifiers for FEC.........................7
5. SDP Offer/Answer Consideration...............................7
6. PSS RTSP Extensions..........................................7
6.1. 3GPP-Link-Char Header....................................7
6.2. 3GPP-Adaptation Header...................................8
6.3. 3GPP-QoE-Metrics Header..................................8
6.4. 3GPP-QoE-Feedback Header.................................8
6.5. Video buffer Headers.....................................8
6.6. Integrity Protection.....................................9
6.7. RTSP URI extension.......................................9
7. IANA Considerations.........................................10
7.1. SDP Registrations.......................................10
7.2. RTSP Registrations......................................15
8. Informative References......................................17
9. Authors' Addresses..........................................18
10. IPR Notice..................................................19
11. Copyright Notice............................................19
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1. Definitions
1.1. Glossary
3GP - 3GPP file format
3GPP - Third Generation Partnership Project
FEC - Forward Error Correction
MBMS - Multimedia Broadcast/Multicast Service
PSS - Packet-switched Streaming Service
RTSP - Real Time Streaming Protocol
SDP - Session Description Protocol
SRTP - Secure Real-time Transport Protocol
QoE - Quality of Experience
QoS - Quality of Service
2. Introduction
3GPP has specified the Packet-switched Streaming Service (PSS) that
uses both RTSP [RFC2326] and SDP [SDPnew]. The service is specified
in technical specifications TS 26.233 [PSS-233] and TS 26.234 [PSS-
234] in Release 4 and later releases. The basic service defined in
Release 4 is enhanced in Release 5 with capability exchange and in
Release 6 with a number of features, such as adaptation, digital
rights management, progressive download as well as a streaming
server file-format defined in [PSS-3GP].
3GPP has also specified the Multimedia Broadcast/Multicast Service
(MBMS) that uses SDP. The IP layer protocols used by this service
are specified in technical specification TS 26.346 Release 6 [MBMS].
In the process of defining these services, there has occasionally
been the need to extend both SDP and RTSP functionality. These
extensions have mostly been in the form of SDP attributes and RTSP
headers. The purpose of this informational document is to register
the SDP extensions, in order to avoid future conflicts, and also to
raise the awareness of their existence within IETF.
The document begins with two chapters presenting the different
extensions of SDP for PSS and MBMS, respectively, followed by a
section noting that offer/answer considerations are not applicable
here. The subsequent section presents the extensions of RTSP for
PSS. The IANA registration of SDP attributes and protocol identifier
is given in section 7.1, and the RTSP headers in section 7.2. For
normative descriptions of all SDP and RTSP extensions we refer to TS
26.234 [PSS-234] and TS 26.346 [MBMS].
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3. PSS SDP Extensions
The PSS specification [PSS-234] defines a number of different SDP
attributes for different purposes. They are informatively listed
below grouped by purpose.
3.1. Video Buffering attributes
The following attributes are used to provide parameters for the
video buffer model provided in Annex G and Section 5.3.3.2 of [PSS-
234]. The attributes were defined in Release 5 as "X-" attributes
and were at the time not considered for registration. In hindsight,
however, they should not have been "X-" attributes, and they should
have been registered, as the registration rules of SDP [SDPnew]
point out. Changing their names today is impossible due to the
deployed base of millions of mobile handsets supporting PSS, and
therefore they are registered in their current form.
All attributes are defined at media level.
- The "a=X-predecbufsize" attribute provides the size of the pre-
decoder buffer.
- The "a=X-initpredecbufperiod" attribute provides the time during
which a receiver should initially buffer before starting to
consume the data in the buffer in order to ensure that underflow
does not occur, assuming correct data delivery.
- The "a=X-initpostdecbufperiod" attribute provides the initial
buffering period for the post-decoder buffer present in H.263 and
MPEG-4 Visual.
- The "a=X-decbyterate" attribute indicates the maximum peak byte-
decoding rate used in the verification of the Annex G buffer
model.
- The "a=3gpp-videopostdecbufsize" attribute is used to indicate
the size of the H.264 video post-decoder buffer.
Note that complete descriptions of these attributes can be found in
section 5.3.3.2 of [PSS-234].
3.2. Video Frame Size attribute
This media-level attribute provides the receiver with the largest
picture size a specific H.263 payload type will carry within the
session. The attribute has the following form (see 5.3.3.2 of [PSS-
234]):
"a=framesize:<payload type number> <width>-<height>"
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3.3. Integrity Protection Configuration Attributes
These attributes are all used to configure the integrity-protection
mechanism defined in Annex K.2 of [PSS-234].
- The session-level attribute "a=3GPP-Integrity-Key" carries the
integrity key used to derive SRTP master keys for integrity
protection. They key is protected in different ways depending on
a method identifier.
- The media-level attribute "a=3GPP-SRTP-Config" is used to
configure SRTP for integrity protection and contains an integrity
nonce, a key salt used in deriving the SRTP master key from the
integrity key, and any SRTP configuration parameters, such as the
integrity tag length.
- The session-level attribute "a=3GPP-SDP-Auth" is used to carry an
authentication tag calculated over certain parts of the SDP to
prevent manipulation of the security attributes.
3.4. The Alternative Attributes
Two media and one session-level attributes are used in a mechanism
for providing alternative SDP lines. One or more SDP lines at media
level can be replaced, if desired, by alternatives. The mechanism is
backwards compatible in the way that a receiver that does not
support the attributes will get the default configuration. The
different alternatives can be grouped using different attributes
that can be specified hierarchically with a top and a lower level.
3GPP Release 6 supports grouping based on bit-rate, according to the
SDP bandwidth modifiers AS and TIAS, and language.
The SDP attributes (see 5.3.3.3 and 5.3.3.4 of [PSS-234]) are:
- The media-level attribute "a=alt:<id>:<SDP-Line>" carries any SDP
line and an alternative identifier.
- The media-level attribute "a=alt-default-id:<id>" identifies the
default configuration to be used in groupings.
- The session-level attribute "a=alt-group" is used to group
different recommended media alternatives.
3.5. Adaptation Attribute
The media-level SDP attribute "a=3GPP-Adaptation-Support" (see
5.3.3.5 of [PSS-234]) is defined as part of the negotiation
procedure of the PSS adaptation mechanism. The adaptation mechanism
allows the client to provide the server with information on the
available transmission bit-rate and receiver buffer status.
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3.6. Quality of Experience Attribute
The session and media-level attribute "a=3GPP-QoE-Metrics" (see
5.3.3.6 of [PSS-234]) is used to negotiate the usage of the quality
of experience metrics. The included parameters indicate which
metrics and parameters that are desirable to use.
3.7. Asset Information Attribute
The session and media-level attribute "a=3GPP-Asset-Information"
(see 5.3.3.7 of [PSS-234]) can exist in multiple instances in a
description and describes different types of asset information. The
different asset classes defined in Release 6 are: Title,
Description, Copyright, Performer, Author, Genre, Rating,
Classification, Keywords, Location, Album, and Recording Year. The
different assets are described with a BASE64-encoded asset box from
the 3GP file format [PSS-3GP].
4. MBMS SDP Extensions
The MBMS specification [MBMS] defines a number of different SDP
attributes for different purposes. They are informatively listed
below.
4.1. MBMS Bearer Mode Declaration Attribute
The session and media-level attribute "a=mbms-mode" (see 7.3.2.7 of
[MBMS]) is used to describe MBMS broadcast mode media. The attribute
may be used at session level to set the default for all media and at
media level to specify differences between media. However, the
attribute is never used at session level, when the session includes
MBMS multicast mode media, nor at media level to describe MBMS
multicast mode media.
4.2. FEC Flow ID Attribute
The media-level attribute "a=mbms-flowid" (see 8.3.1.9 of [MBMS])
maps one or more FEC source block flow IDs to their corresponding
destination IP addresses and UDP port numbers. It is present in each
SDP media block for repair packet streams.
4.3. MBMS Repair Attribute
The session and media-level attribute "a=mbms-repair" (see 8.3.1.8
of [MBMS]) is used to provide FEC repair packets with non-FEC
specific parameters. For Release 6 one such parameter is defined,
specifying the required minimum receiver buffer time.
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4.4. SDP Protocol Identifiers for FEC
MBMS defines a mechanism to provide block based FEC for UDP based
traffic. This solution uses the SDP protocol "proto" identifier to
identify the media streams that use the FEC shim layer. The media
streams may be both source streams and repair streams.
For FEC protected RTP streams the following two "proto" identifiers
are defined:
- UDP/MBMS-FEC/RTP/AVP
- UDP/MBMS-FEC/RTP/SAVP
Both are defined in Section C.1 of 3GPP TS 26.346 [MBMS]. They
indicate the usage of UDP with MBMS FEC Source packet formats that
transport RTP packets in accordance with the AVP or SAVP (Secure
RTP) profiles, respectively.
Section C.2 of TS 26.346 [MBMS] defines an SDP "proto" identifier
"UDP/MBMS-REPAIR" for indication of a media stream of MBMS FEC
repair packets. MBMS FEC repair packets are repair symbols with the
necessary framing sent as UDP packets.
5. SDP Offer/Answer Consideration
The usage of the SDP attributes in an Offer/Answer [RFC3264] context
is not defined. These SDP attributes are defined for being used in a
declarative context, in PSS specifically RTSP [RFC2327].
6. PSS RTSP Extensions
The RTSP extensions for PSS consist of a number of new RTSP headers
and a narrowing of URI usage in regards to 3GP files. The headers
are informatively described here; see [PSS-234] for the normative
declaration.
6.1. 3GPP-Link-Char Header
The 3GPP-Link-Char header (see 5.3.2.1 of [PSS-234]) is used by
clients to provide the server with QoS information about the
wireless link it is currently using. The header can be used to
provide the server with three different QoS parameters:
- Guaranteed Bandwidth
- Maximum Bandwidth
- Maximum Transfer Delay
The header may be included in RTSP requests using either of the
methods SETUP, PLAY, OPTIONS and SET_PARAMETER.
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6.2. 3GPP-Adaptation Header
The 3GPP-Adaptation header (see 5.3.2.2 of [PSS-234]) is used by the
client to provide the server with adaptation-related parameters and
to indicate support of the adaptation function. The header carries
the resource identification as a URI, the client's buffer size, and
the desired target time.
The header may be included in requests using the methods SETUP,
PLAY, OPTIONS and SET_PARAMETER. The response to a request using
this method shall include this header.
6.3. 3GPP-QoE-Metrics Header
The 3GPP-QoE-Metrics header (see 5.3.2.3.1 of [PSS-234]) is used to
negotiate the usage of the quality of experience (QoE) metrics (see
Section 11 of [PSS-234]).
The header may be included in requests and responses using the
SETUP, SET_PARAMTER, OPTIONS or PLAY method.
6.4. 3GPP-QoE-Feedback Header
The 3GPP-QoE-Feedback header (see 5.3.2.3.2 of [PSS-234]) is used to
carry QoE metrics from the client to the server when it reports,
which happen either during or at the end of the media delivery.
The header may be included in requests using the SET_PARAMETER,
PAUSE, or TEARDOWN method.
6.5. Video buffer Headers
PSS uses several headers to provide the client with the different
buffer parameters. They provide the buffer status at the point of a
stream that a PLAY request plays from. These headers may only be
used in PLAY responses. See Section 5.3.2.4 and Annex G of [PSS-234]
for normative definitions.
The three "x-" headers were defined in 3GPP Release 5. When it was
realized that they should not have been given "x-" names it was too
late rename them due to deployment.
The RTSP headers are:
- x-predecbufsize
- x-initpredecbufperiod
- x-initpostdecbufperiod
- 3gpp-videopostdecbufsize
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6.6. Integrity Protection
The integrity-protection mechanism defined in PSS Annex K uses the
"3GPP-Freshness-Token" (See Annex K.2.2.4 of [PSS-234]) RTSP header
to carry a freshness token in DESCRIBE requests.
6.7. RTSP URI extension
The PSS specification also defines syntax for referencing tracks
within the "3GP" file format [PSS-3GP]. The 3GP format is based on
the ISO base media file format and defined in several different
profiles, including a streaming-server profile, in Release 6.
To identify a track within a 3GP file the last URI segment shall
contain a structure that is <alpha string>=<track nr> (See 5.3.3.1
of [PSS-234]).
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7. IANA Considerations
7.1. SDP Registrations
IANA is requested to register the SDP attributes listed below in the
registry at http://www.iana.org/assignments/sdp-parameters. The
contact person for this registration is Magnus Westerlund
(magnus.westerlund@ericsson.com) Phone number +46 8 719 0000.
SDP Protocol Identifiers ("proto"):
Name: UDP/MBMS-FEC/RTP/AVP
Long form: 3GPP MBMS FEC protected RTP/AVP over UDP
Type of name: proto
Purpose: 3GPP TS 26.346
Reference: 3GPP TS 26.346
Name: UDP/MBMS-FEC/RTP/SAVP
Long form: 3GPP MBMS FEC protected RTP/SAVP over UDP
Type of name: proto
Purpose: 3GPP TS 26.346
Reference: 3GPP TS 26.346
Name: UDP/MBMS-REPAIR
Long form: 3GPP MBMS FEC repair symbols over UDP
Type of name: proto
Purpose: 3GPP TS 26.346
Reference: 3GPP TS 26.346
SDP Attribute ("att-field"):
Attribute name: X-predecbufsize
Long form: Pre-decoder buffer size
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.1
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
Attribute name: X-initpredecbufperiod
Long form: Pre-decoder initial buffering period
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.1
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
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Attribute name: X-initpostdecbufperiod
Long form: Post-decoder initial buffering period
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.1
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
Attribute name: X-decbyterate
Long form: Peak decoding rate in bytes per second
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.1
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
Attribute name: 3gpp-videopostdecbufsize
Long form: Post decoder buffer size
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.1
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
Attribute name: framesize
Long form: Maximum Video Frame Size
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.2
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
Attribute name: 3GPP-Integrity-Key
Long form: 3GPP DRM Integrity Key
Type of name: att-field
Type of attribute: Session level only
Subject to charset: No
Purpose: See Section 3.3
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
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Attribute name: 3GPP-SRTP-Config
Long form: 3GPP DRM SRTP Configuration
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.3
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
Attribute name: 3GPP-SDP-Auth
Long form: 3GPP DRM Integrity SDP Authentication
Type of name: att-field
Type of attribute: Session level only
Subject to charset: No
Purpose: See Section 3.3
Reference: 3GPP TS 26.234, Section 5.3.3.2
Values: See Reference
Attribute name: alt
Long form: Alternative SDP line
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.4
Reference: 3GPP TS 26.234, Section 5.3.3.3
Values: See Reference
Attribute name: alt-default-id
Long form: Default alternative ID
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.4
Reference: 3GPP TS 26.234, Section 5.3.3.3
Values: See Reference
Attribute name: alt-group
Long form: Grouping of SDP Line alternatives
Type of name: att-field
Type of attribute: Session level only
Subject to charset: No
Purpose: See Section 3.4
Reference: 3GPP TS 26.234, Section 5.3.3.4
Values: See Reference
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Attribute name: 3GPP-Adaptation-Support
Long form: 3GPP Adaptation Support
Type of name: att-field
Type of attribute: Media level only
Subject to charset: No
Purpose: See Section 3.5
Reference: 3GPP TS 26.234, Section 5.3.3.5
Values: See Reference
Attribute name: 3GPP-QoE-Metrics
Long form: 3GPP Quality of Experience Metrics
Type of name: att-field
Type of attribute: Session and Media level
Subject to charset: No
Purpose: See Section 3.6
Reference: 3GPP TS 26.234, Section 5.3.3.6
Values: See Reference
Attribute name: 3GPP-Asset-Information
Long form: 3GPP Asset Information
Type of name: att-field
Type of attribute: Session and Media level
Subject to charset: No
Purpose: See Section 3.7
Reference: 3GPP TS 26.234, Section 5.3.3.7
Values: See Reference
Attribute name: mbms-mode
Long form: MBMS Bearer Mode Declaration
Type of name: att-field
Type of attribute: Session and Media level
Subject to charset: No
Purpose: See Section 4.1
Reference: 3GPP TS 26.346, Section 7.3.2.7
Values: See Reference
Attribute name: mbms-flowid
Long form: FEC Flow ID
Type of name: att-field
Type of attribute: Media level
Subject to charset: No
Purpose: See Section 4.2
Reference: 3GPP TS 26.346, Section 8.3.1.9
Values: See Reference
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Attribute name: mbms-repair
Long form: MBMS Repair
Type of name: att-field
Type of attribute: Session and Media level
Subject to charset: No
Purpose: See Section 4.3
Reference: 3GPP TS 26.346, Section 8.3.1.8
Values: See Reference
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7.2. RTSP Registrations
It is request of IANA to register the below listed RTSP Headers in
the RTSP 1.0 registry at:
http://www.iana.org/assignments/rtsp-parameters.
The contact person for this registration is Magnus Westerlund
(magnus.westerlund@ericsson.com) Phone number +46 8 719 0000.
Header Name: 3GPP-Freshness-Token
Purpose: See Section K.2 of 3GPP TS 26.234
Methods: Describe Requests
Reference: Section K.2.2.4 of 3GPP TS 26.234
Values: See Reference
Header Name: 3GPP-Link-Char
Purpose: See Section 5.3.2.1 of 3GPP TS 26.234
Methods: SETUP, PLAY, OPTIONS or SET_PARAMETER requests
Reference: Section 5.3.2.1 of 3GPP TS 26.234
Values: See Reference
Header Name: 3GPP-Adaptation
Purpose: See Section 5.3.2.2 of 3GPP TS 26.234
Methods: SETUP, PLAY, OPTIONS, or SET_PARAMETER Requests
and Responses
Reference: Section K.2.2.4 of 3GPP TS 26.234
Values: See Reference
Header Name: 3GPP-QoE-Metrics
Purpose: See Section 5.3.2.3.1 of 3GPP TS 26.234
Methods: Describe Requests
Reference: Section 5.3.2.3.1 of 3GPP TS 26.234
Values: See Reference
Header Name: 3GPP-QoE-Feedback
Purpose: See Section 5.3.2.3.2 of 3GPP TS 26.234
Methods: Describe Requests
Reference: Section 5.3.2.3.2 of 3GPP TS 26.234
Values: See Reference
Header Name: x-predecbufsize
Purpose: See Section 5.3.2.4 of 3GPP TS 26.234
Methods: Describe Requests
Reference: Section 5.3.2.4 of 3GPP TS 26.234
Values: See Reference
Header Name: x-initpredecbufperiod
Purpose: See Section 5.3.2.4 of 3GPP TS 26.234
Methods: Describe Requests
Reference: Section 5.3.2.4 of 3GPP TS 26.234
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Values: See Reference
Header Name: x-initpostdecbufperiod
Purpose: See Section 5.3.2.4 of 3GPP TS 26.234
Methods: Describe Requests
Reference: Section 5.3.2.4 of 3GPP TS 26.234
Values: See Reference
Header Name: 3gpp-videopostdecbufsize
Purpose: See Section 5.3.2.4 of 3GPP TS 26.234
Methods: Describe Requests
Reference: Section 5.3.2.4 of 3GPP TS 26.234
Values: See Reference
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8. Informative References
[RFC2326] H. Schulzrinne, A. Rao, R. Lanphier, "Real Time Streaming
Protocol (RTSP)", RFC 2326, April 1998.
[RFC2327] M. Handley and V. Jacobson, "SDP: Session Description
Protocol", RFC 2327, April 1998.
[PSS-233] 3GPP TS 26.233, "Transparent end-to-end packet switched
streaming service (PSS) General Description", version
6.0.0 (2004-09), 3rd Generation Partnership Project
(3GPP).
[PSS-234] 3GPP TS 26.234, "Transparent end-to-end Packet-switched
Streaming Service (PSS); Protocols and codecs", version
6.7.0 (2006-03), 3rd Generation Partnership Project
(3GPP).
[PSS-3GP] 3GPP TS 26.244, "Transparent end-to-end packet switched
streaming service (PSS); 3GPP file format (3GP)", version
6.4.0 (2005-09), 3rd Generation Partnership Project
(3GPP).
[MBMS] 3GPP TS 26.346, "Multimedia Broadcast/Multicast Service
(MBMS); Protocols and codecs", version 6.4.0 (2006-03),
3rd Generation Partnership Project (3GPP).
[RTSPbis] H. Schulzrinne, A. Rao, R. Lanphier, M. Westerlund, A.
Narasimhan, "Real Time Streaming Protocol (RTSP)", draft-
ietf-mmusic-rfc2326bis-11.txt, work in progress.
[SDPnew] M. Handley, V. Jacobson, C Perkins, "SDP: Session
Description Protocol," draft-ietf-mmusic-sdp-new-26.txt,
Jan 2006, work in progress.
[RFC3264] J. Rosenberg and H. Schulzrinne, "An Offer/Answer Model
with the Session Description Protocol (SDP)", RFC 3264,
June 2002.
Any 3GPP document can be downloaded from the 3GPP webserver,
"http://www.3gpp.org/", see specifications.
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9. Authors' Addresses
Magnus Westerlund
Ericsson Research
Ericsson AB
SE-164 80 Stockholm
SWEDEN
Phone: +46 8 7190000
EMail: Magnus.Westerlund@ericsson.com
Per Frojdh
Ericsson Research
Ericsson AB
SE-164 80 Stockholm
SWEDEN
Phone: +46 8 7190000
EMail: Per.Frojdh@ericsson.com
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INTERNET-DRAFT SDP & RTSP extensions for 3GPP PSS & MBMS March 6, 2006
10. IPR Notice
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed
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it has made any independent effort to identify any such rights.
Information on the procedures with respect to rights in RFC
documents can be 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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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.
11. Copyright Notice
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.
This document and the information contained herein are provided on
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REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE
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This Internet-Draft expires in September 2006.
RFC Editor Considerations
None
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