| SIPREC | R. Ravindranath |
| Internet-Draft | Cisco |
| Intended status: Standards Track | Parthasarathi. Ravindran |
| Expires: February 8, 2015 | Nokia Networks |
| Paul. Kyzivat | |
| Huawei | |
| August 7, 2014 |
Session Initiation Protocol (SIP) Recording Metadata
Session recording is a critical requirement in many communications environments such as call centers and financial trading. In some of these environments, all calls must be recorded for regulatory, compliance, and consumer protection reasons. Recording of a session is typically performed by sending a copy of a media stream to a recording device. This document describes the metadata model as viewed by Session Recording Server(SRS) and the Recording metadata format.
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This Internet-Draft will expire on February 8, 2015.
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Session recording is a critical requirement in many communications environments such as call centers and financial trading. In some of these environments, all calls must be recorded for regulatory, compliance, and consumer protection reasons. Recording of a session is typically performed by sending a copy of a media stream to a recording device. This document focuses on the Recording metadata which describes the communication session. The document describes a metadata model as viewed by Session Recording Server and the Recording metadata format, the requirements for which are described in [RFC6341] and the architecture for which is described in [RFC7245].
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. This document only uses these key words when referencing normative statements in existing RFCs."
Metadata Model: An abstract representation of metadata using a Unified Modelling Language(UML) class diagram.
Metadata classes: Each block in the model represents a class. A class is a construct that is used as a blueprint to create instances(called objects) of itself. The description of each class also has representation of its attributes in a second compartment below the class name.
Attributes: Attributes represent the elements listed in each of the classes. The attributes of a class are listed in the second compartment below the class name. Each instance of class conveys values for these attributes which adds to the recording's Metadata.
Linkages: Linkages represent the relationship between the classes in the model. Each represents a logical connection between classes(or objects) in class diagrams/ object diagrams. The linkages used in the Metadata model of this document are associations.
Metadata is the information that describes recorded media and the CS to which they relate. The diagram below shows a model for Metadata as viewed by a Session Recording Server (SRS).
+-------------------------------+
| Recording Session (RS) |
+-------------------------------+
|1..* | 1..*
| |
| | 0..*
| +-----------------+
+------------+ | | Communication |
| CSRS | | | Session (CS) |
| Association|--+ | Group |
| | | +-----------------+
+------------+ | | 0..1
| |
|0..* | 1..*
+-------------------------------+
| Communication Session (CS) |
| |
+-------------------------------+
| 1..* |0..1
+-----+ |
| | 0..* |0..*
| +-------------+ receives +----------------+
| | Participant |----------| Media Streams |
| | |0..* 0..*| |
| | | | |
| | | | |
| | | sends | |
| | |----------| |
| | |1.* 0..*| |
| +-------------+ +----------------+
| | |
| | |
| +------------------------+------------+
| |
| |
| +------------------+ +----------------------+
| |ParticipantCS | | ParticipantStream |
+-----------| Association | | Association |
| | | |
+------------------+ +----------------------+
The Metadata model is a class diagram in Unified Modelling Language(UML). The model describes the structure of a metadata in general by showing the classes, their attributes, and the relationships among the classes. Each block in the model above represents a class. The linkages between the classes represents the relationships which can be associations or Composition. The metadata is conveyed from SRC to SRS.
The model allows the capture of a snapshot of a recording's Metadata at a given instant in time. Metadata changes to reflect changes in what is being recorded. For example, if a participant joins a conference, then the SRC sends the SRS a snapshot of metadata having that participant information (with attributes like name/AoR pair and associate-time.)
Some of the metadata is not required to be conveyed explicitly from the SRC to the SRS, if it can be obtained contextually by the SRS(e.g., from SIP or SDP signalling).
This section gives an overview of the Recording Metadata Format. Some data from the metadata model is assumed to be made available to the SRS through Session Description Protocol (SDP)[RFC4566], and therefore this data is not represented in the XML document format specified in this document. SDP attributes describe different media formats like audio, video. The other metadata attributes, such as participant details, are represented in a new Recording specific XML document of type 'application/rs-metadata+xml'. The SDP label attribute [RFC4574] provides an identifier by which a metadata XML document can refer to a specific media description in the SDP sent from the SRC to the SRS.
The XML document format can be used to represent either the complete metadata or a partial update to the metadata. The latter includes only elements that have changed compared to the previously reported metadata.
Every recording metadata XML document MUST contain a <recording> element. The <recording> element acts as a container for all other elements in this XML document.
A recording object is a XML document. It MUST have the XML declaration and it SHOULD contain an encoding declaration in the XML declaration, e.g., "<?xml version='1.0' encoding='UTF-8'?>". If the charset parameter of the MIME content type declaration is present and it is different from the encoding declaration, the charset parameter takes precedence.
Every application conforming to this specification MUST accept the UTF-8 character encoding to ensure the minimal interoperability.
Syntax and semantic errors in an XML document should be reported to the originator using application specific mechanisms.
The namespace URI for elements defined by this specification is a Uniform Resource Namespace (URN) [RFC2141], using the namespace identifier 'ietf' defined by [RFC2648] and extended by [RFC3688].
The URN is: urn:ietf:params:xml:ns:recording
The <recording> element MUST contain an xmlns namespace attribute with value as urn:ietf:params:xml:ns:recording. One recording element MUST be present in every recording metadata XML document.
A recording element MAY contain a <dataMode> element indicating whether the XML document is a complete document or a partial update. If no <dataMode> element is present then the default value is "complete".
This section describes each class of the metadata model, and the attributes of each class. This section also describes how different classes are linked and the XML element for each of them.
+-------------------------------+
| Recording Session (RS) |
+-------------------------------+
| |
| Start/End Time |
| |
| |
| |
+-------------------------------+
|1..* | 1..*
| |
|0..* | 0..*
Communication Communication
Session Session Group(CS Group)
Each instance of a Recording Session class (namely the Recording Session Object) represents a SIP session created between an SRC and SRS for the purpose of recording a Communication Session.
A Recording Session class has the following attributes:
Each instance of Recording Session has:
CSs and CSGs are optional to accommodate persistent recording, where there may sometimes be none.
A Recording Session object is represented by a <recording> XML element. That in turn relies on the SIP/SDP session with which the XML document is associated to provide some of the attributes of the Recording Session element.
Start and End time value are derivable from Date header(if present in SIP message) in RS. In cases where Date header is not present, Start/End time are derivable from the time at which SRS receives the notification of SIP message to setup RS / disconnect RS.
Recording Session (RS)
| 1..*
|
| 0..*
+-------------------------------+
| Communication Session |
| Group |
+-------------------------------+
| Unique-ID |
| associate-time |
| disassociate-time |
| |
+-------------------------------+
| 0..1
|
| 1..*
Communication Session (CS)
One instance of a Communication Session Group class (namely the Communication Session Group object) provides association or linking of Communication Sessions.
A CS Group has the following attributes:
The linkages between Communication Session Group class and other classes are associations. A communication Session Group is associated with RS and CS in the following manner:
The <group> element is an optional element provides the information about the communication session group
Each communication session group (CSG)object is represented using one group element. Each <group> element has a unique 'group-id' attribute which uniquely identifies the CSG.
Recording Communication Session Session Group(CS Group) |1..* | 0..1 | | |0..* | 1..* +-------------------------------+ | Communication Session (CS) | | | +-------------------------------+ | CS Identifier | | Termination Reason | | Start-time | | Stop-time | +-------------------------------+ | | | 0..* |0..1 | | | 0..* |0..* Participant Media Stream
A Communication Session class and its object in the metadata model represents a Communication Session and its properties needed as seen by the SRC.
A communication Session class has the following attributes:
This document does not specify attributes relating to what should happen to a recording of a CS after it has been delivered to the SRS. (E.g., how long to retain the recording, what access controls to apply.) The SRS is assumed to behave in accordance with policy. The ability for the SRC to influence this policy is outside the scope of this document. However if there are implementations where SRC has enough information, this could be sent as Extension Data attached to the CS
A Communication Session is linked to CS-Group, Participant, Media Stream and Recording Session classes using the association relationship. Association between CS and Participant allows:
Association between CS and Media Stream allows:
Association between CS and RS allows:
The <session> element provides the information about the Communication Session
Each communication session(CS) object is represented by one session element. Each session element has unique 'session_id' attribute which helps to uniquely identify the CS.
The XML <reason> element MAY be included in metadata to represent a CS Termination Reason. There MAY be multiple instances of the XML <reason> element inside a session element. The <reason> XML element has 'protocol' as an attribute, which indicates the protocol from which the reason string is derived. The default value for protocol attribute is "SIP". The <reason> element can be derived from a SIP Reason header in the CS.
A <group-ref> element MAY be present to indicate the group to which the enclosing session belongs.
1..* 0..*
Recording Communication
Session ----------+---------- Session
|
|
|
+-------------------+
| CSRSAssociation |
+-------------------+
| Association-Time |
| Disassociaton-Time|
+-------------------+
The CSRS Association class describes the association of a CS to an RS for a period of time. A single CS may be associated with different RSs (perhaps by different SRCs) and may be associated and dissociated several times.
CSRS association class has the following attributes:
CSRS association class is linked to CS and RS classes.
The <sessionrecordingassoc> XML element represents the CSRS association object. The 'session_id' attribute is used to uniquely identify this element and link with a specific session. The recording object is implicitly defined by the enclosing <recording> element.
Communication Session (CS)
| 0..*
|
| 0..*
+-------------------------------+
| Participant |
| |
+-------------------------------+
| AoR / Name Pair list |
| |
| |
+-------------------------------+
| 0..* 1..*|
receives| |sends
| 0..* 0..*|
Media Stream
A Participant class and its objects has information about a device that is part of a CS and/or contributes/consumes media stream(s) belonging to a CS.
Participant has a single defined attribute:
The participant class is linked to MS and CS class using association relationship. The association between participant and Media Stream allows:
A <participant> element represents a Participant object.
Participant MUST have a NameID complex element which contains AoR as attribute and Name as element. AOR element is SIP/SIPS URI FQDN or IP address which represents the user. name is an optional element to represent display name.
Each participant has a unique 'participant_id' attribute. This MUST be used for all references to a participant within a CSG, and MAY be used to reference the same participant more globally. (The decision to use a participant_id across multiple CSGs or recording sessions is at the discretion of the implementer.)
1..* 0..*
Communication
Session ----------+---------- Participant
|
|
|
+-------------------+
| ParticipantCS |
| Association |
+-------------------+
| Capabilities |
| Association-Time |
| Disassociaton-Time|
+-------------------+
The Participant CS Association class describes the association of a Participant to an CS for a period of time. A participant may be associated and dissociated from a CS several times. (For example, connecting to a conference, then disconnecting, then connecting again.)
ParticipantCS association class has the following attributes:
The participantCS association class is linked to participant and CS classes.
The <participantsessionassoc> XML element represents a participantCS association object. The 'participant_id' and 'session_id' attributes are used to uniquely identify this element.
NOTE: RFC 4235 encoding shall be used to represent capabilities attribute in XML.
Participant
| 0..* 1..*|
receives| |sends
| 0..* 0..*|
+-------------------------+
| Media Stream |
| |
Communication 0..1 0..* +-------------------------+
Session ------------| |
| Media Stream Reference |
| Content-type |
| |
+-------------------------+
A Media Stream class (and its objects) has the properties of media as seen by SRC and sent to SRS. Different snapshots of a media stream object may be sent whenever there is a change in media (e.g. direction change like pause/resume and/or codec change and/or participant change.).
A Media Stream class has the the following attributes:
The metadata model should include media streams that are not being delivered to the SRS. Examples include cases where SRC offered certain media types but SRS chooses to accept only a subset of them OR an SRC may not even offer a certain media type due it its restrictions to record
A Media Stream is linked to participant and CS classes using the association relationship. The details of association with the Participant are described in the Participant class section. The details of association with CS is mentioned in the CS section.
The <stream> element represents a Media Stream object. Stream element indicates SDP media lines associated with the session and participants.
The <label> element within the <stream> element references an SDP "a=label" attribute that identifies an m-line within the RS SDP. That m-line carries the media stream from the SRC to the SRS.
Each stream element has unique 'stream_id' attribute which helps to uniquely identify stream and 'session_id' attribute to associate the stream with specific session element.
If the SRC wishes to convey the Content-type to the SRS, it does so by including an 'a=content' attribute with the m-line in the RS SDP.
+-------------------+
| ParticipantSteam |
| Association |
+-------------------+ +----------Participant
| Association-Time | | 0..*| 1..*|
| Disassociaton-Time|---+ recv| |sends
| Recv | | 0..*| 0..*|
| Send | | | |
+-------------------+ | | |
+----------Media Stream
A ParticipantStream association class describes the association of a Participant to a Media Stream for a period of time, as a sender or as a receiver, or both.
A participantStream association class has the following attributes:
The participantStream association class is linked to participant and Stream classes.
The <participantstreamassoc> XML element represents the participant to stream association object. This XML element is used to represent a snapshot of a participant association with a stream. The send and recv XML elements MUST be used to indicate whether a participant is contributing to a stream or receiving a stream. There MAY be multiple instances of the send and recv XML elements inside a particpantstreamassoc element. If a metadata snapshot is sent with a participantstreamassoc that does not have any send and recv elements, it means that participant is neither contributing to any streams nor receiving any streams.
The XML <associate-time> and <disassociate-time> elements contain strings indicating the date and time of the status change of this tuple. The value of these elements MUST follow the IMPP datetime format [RFC3339]. Timestamps that contain 'T' or 'Z' MUST use the capitalized forms. At a time, any of the time tuple associate-time or disassociate-time MAY exist in the element namely group, session, participant and not both timestamp at the same time.
As a security measure, the timestamp element SHOULD be included in all tuples unless the exact time of the status change cannot be determined.
A Unique id is generated in two steps:
The above mentioned unique-id mechanism SHOULD be used for each metadata element. Multiple SRCs can refer to the same element/UUID (how each SRC learns the UUID here is out of scope of SIPREC)
This section defines a version indicator for metadata XML.
This version value allows the SRS to know the exact metadata XML schema used by the SRC. This document describes version 1. Implementations may not interoperate if the version implemented by the sender is not known by the receiver. No negotiation of versions is provided. There is no significance to the version number although documents which update or obsolete this document (possibly including drafts of such documents) should include a higher version number if the metadata XML schema changes.
The following example provides all the tuples involved in Recording Metadata XML body.
<?xml version="1.0" encoding="UTF-8"?>
<recording xmlns='urn:ietf:params:xml:ns:recording:1'>
<dataMode>complete</dataMode>
<group group_id="7+OTCyoxTmqmqyA/1weDAg==">
<associate-time>2010-12-16T23:41:07Z</associate-time>
<!-- Standardized extension -->
<call-center xmlns='urn:ietf:params:xml:ns:callcenter'>
<supervisor>sip:alice@atlanta.com</supervisor>
</call-center>
<mydata xmlns='http://example.com/my'>
<structure>FOO!</structure>
<whatever>bar</whatever>
</mydata>
</group>
<session session_id="hVpd7YQgRW2nD22h7q60JQ==">
<group-ref>7+OTCyoxTmqmqyA/1weDAg==
</group-ref>
<!-- Standardized extension -->
<uniqueid>FaXHlc+3WruaroDaNE87am==</uniqueid>
<structure>FOO!</structure>
<whatever>bar</whatever>
</session>
<sessionrecordingassoc session_id="hVpd7YQgRW2nD22h7q60JQ==">
<associate-time>2010-12-16T23:41:07Z</associate-time>
</sessionrecordingassoc>
<participant
participant_id="srfBElmCRp2QB23b7Mpk0w==">
<nameID aor=sip:bob@biloxi.com>
<name xml:lang="it">Bob B</name>
</nameID>
<!-- Standardized extension -->
<structure>FOO!</structure>
<whatever>bar</whatever>
</participant>
<participantsessionassoc
participant_id="srfBElmCRp2QB23b7Mpk0w=="
session_id="hVpd7YQgRW2nD22h7q60JQ==">
<associate-time>2010-12-16T23:41:07Z</associate-time>
</participantsessionassoc>
<participantstreamassoc
participant_id="srfBElmCRp2QB23b7Mpk0w==">
<send>i1Pz3to5hGk8fuXl+PbwCw==</send>
<send>UAAMm5GRQKSCMVvLyl4rFw==</send>
<recv>8zc6e0lYTlWIINA6GR+3ag==</recv>
<recv>EiXGlc+4TruqqoDaNE76ag==</recv>
</participantstreamassoc>
<participant
participant_id="zSfPoSvdSDCmU3A3TRDxAw==">
<nameID aor=sip:Paul@biloxy.com>
<name xml:lang="it">Paul</name>
</nameID>
<!-- Standardized extension -->
<structure>FOO!</structure>
<whatever>bar</whatever>
</participant>
<participantsessionassoc
participant_id="zSfPoSvdSDCmU3A3TRDxAw=="
session_id="hVpd7YQgRW2nD22h7q60JQ==">
<associate-time>2010-12-16T23:41:07Z</associate-time>
</participantsessionassoc>
<participantstreamassoc
participant_id="zSfPoSvdSDCmU3A3TRDxAw==">
<send>8zc6e0lYTlWIINA6GR+3ag==</send>
<send>EiXGlc+4TruqqoDaNE76ag==</send>
<recv>UAAMm5GRQKSCMVvLyl4rFw==</recv>
<recv>i1Pz3to5hGk8fuXl+PbwCw==</recv>
</participantstreamassoc>
<stream stream_id="UAAMm5GRQKSCMVvLyl4rFw=="
session session_id="hVpd7YQgRW2nD22h7q60JQ==">
<label>96</label>
</stream>
<stream stream_id="i1Pz3to5hGk8fuXl+PbwCw=="
session_id="hVpd7YQgRW2nD22h7q60JQ==">
<label>97</label>
</stream>
<stream stream_id="8zc6e0lYTlWIINA6GR+3ag=="
session_id="hVpd7YQgRW2nD22h7q60JQ==">
<label>98</label>
</stream>
<stream stream_id="EiXGlc+4TruqqoDaNE76ag=="
session_id="hVpd7YQgRW2nD22h7q60JQ==">
<label>99</label>
</stream>
</recording>
SIP Recording Metadata Example XML body
The following example provides partial update in Recording Metadata XML body for the above example. The example has a snapshot that carries the disassociate-time for a participant from a session.
<?xml version="1.0" encoding="UTF-8"?>
<recording xmlns='urn:ietf:params:xml:ns:recording:1'>
<dataMode>partial</dataMode>
<participant
participant_id="srfBElmCRp2QB23b7Mpk0w==">
<name ID=sip:bob@biloxi.com>
<name xml:lang="it">Bob R</name>
</nameID>
<structure>FOO!</structure>
<whatever>bar</whatever>
</participant>
<participantsessionassoc
participant_id="srfBElmCRp2QB23b7Mpk0w=="
session_id="hVpd7YQgRW2nD22h7q60JQ==">
<disassociate-time>2010-12-16T23:41:07Z</disassociate-time>
</participantsessionassoc>
</recording>
Partial update of SIP Recording Example XML body
This section defines XML schema for Recording metadata document
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="urn:ietf:params:xml:ns:recording:1"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:tns="urn:ietf:params:xml:ns:recording"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<!-- This import brings in the XML language attribute xml:lang-->
<xs:import namespace="http://www.w3.org/XML/1998/namespace"/>
<xs:element name="recording" type="tns:recording"/>
<xs:complexType name="recording">
<xs:sequence>
<xs:element name="datamode" type="tns:dataMode"
minOccurs="0"/>
<xs:element name="group" type="tns:group"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="session" type="tns:session"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="participant" type="tns:participant"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="stream" type="tns:stream"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="sessionrecordingassoc"
type="tns:sessionrecordingassoc"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="participantsessionassoc"
type="tns:participantsessionassoc"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="participantstreamassoc"
type="tns:participantstreamassoc"
minOccurs="0" maxOccurs="unbounded"/>
<xs:any namespace='##other'
minOccurs='0'
maxOccurs='unbounded'
processContents='lax'/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="group">
<xs:sequence>
<xs:element name="associate-time" type="xs:dateTime"
minOccurs="0"/>
<xs:element name="disassociate-time" type="xs:dateTime"
minOccurs="0"/>
<xs:any namespace='##other'
minOccurs='0'
maxOccurs='unbounded'
processContents='lax'/>
</xs:sequence>
<xs:attribute name="group_id" type="xs:base64Binary"
use="required"/>
</xs:complexType>
<xs:complexType name="session">
<xs:sequence>
<xs:element name="reason" type="tns:reason" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element name="group-ref" type="xs:base64Binary"
minOccurs="0" maxOccurs="1"/>
<xs:element name="start-time" type="xs:dateTime"
minOccurs="0" maxOccurs="1"/>
<xs:element name="stop-time" type="xs:dateTime"
minOccurs="0" maxOccurs="1"/>
<xs:any namespace='##other'
minOccurs='0'
maxOccurs='unbounded'
processContents='lax'/>
</xs:sequence>
<xs:attribute name="session_id" type="xs:base64Binary"
use="required"/>
</xs:complexType>
<xs:complexType name="sessionrecordingassoc">
<xs:sequence>
<xs:element name="associate-time" type="xs:dateTime"
minOccurs="0"/>
<xs:element name="disassociate-time" type="xs:dateTime"
minOccurs="0"/>
<xs:any namespace='##other'
minOccurs='0'
maxOccurs='unbounded'
processContents='lax'/>
</xs:sequence>
<xs:attribute name="session_id" type="xs:base64Binary"
use="required"/>
</xs:complexType>
<xs:complexType name="participant">
<xs:sequence>
<xs:element name="nameID" type="tns:nameID"
maxOccurs='unbounded'/>
<xs:element name="param" minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:attribute name="pname" type="xs:string" use="required"/>
<xs:attribute name="pval" type="xs:string" use="required"/>
</xs:complexType>
</xs:element>
<xs:any namespace='##other'
minOccurs='0'
maxOccurs='unbounded'
processContents='lax'/>
</xs:sequence>
<xs:attribute name="participant_id" type="xs:base64Binary"
use="required"/>
</xs:complexType>
<xs:complexType name="participantsessionassoc">
<xs:sequence>
<xs:element name="associate-time" type="xs:dateTime"
minOccurs="0"/>
<xs:element name="disassociate-time" type="xs:dateTime"
minOccurs="0"/>
<xs:any namespace='##other'
minOccurs='0'
maxOccurs='unbounded'
processContents='lax'/>
</xs:sequence>
<xs:attribute name="participant_id" type="xs:base64Binary"
use="required"/>
<xs:attribute name="session_id" type="xs:base64Binary"
use="required"/>
</xs:complexType>
<xs:complexType name="participantstreamassoc">
<xs:sequence>
<xs:element name="send" type="xs:base64Binary"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="recv" type="xs:base64Binary"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="associate-time" type="xs:dateTime"
minOccurs="0"/>
<xs:element name="disassociate-time" type="xs:dateTime"
minOccurs="0"/>
<xs:any namespace='##other'
minOccurs='0'
maxOccurs='unbounded'
processContents='lax'/>
</xs:sequence>
<xs:attribute name="participant_id" type="xs:base64Binary"
use="required"/>
</xs:complexType>
<xs:complexType name="stream">
<xs:sequence>
<xs:element name="label" type="xs:string"
minOccurs="0" maxOccurs="1"/>
<xs:any namespace='##other'
minOccurs='0'
maxOccurs='unbounded'
processContents='lax'/>
</xs:sequence>
<xs:attribute name="stream_id" type="xs:base64Binary"
use="required"/>
<xs:attribute name="session_id" type="xs:base64Binary"/>
</xs:complexType>
<xs:simpleType name="dataMode">
<xs:restriction base="xs:string">
<xs:enumeration value="complete"/>
<xs:enumeration value="partial"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="nameID">
<xs:sequence>
<xs:element name="name" type ="tns:name" minOccurs="0"
maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="aor" type="xs:anyURI" use="required"/>
</xs:complexType>
<xs:complexType name="name">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute ref="xml:lang" use="optional"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="reason">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute type="xs:short" name="cause" use="required"/>
<xs:attribute type="xs:string" name="protocol" default="SIP"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:schema>
The metadata information sent from SRC to SRS MAY reveal sensitive information about different participants in a session. For this reason, it is RECOMMENDED that a SRC use a strong means for authentication and metadata information protection and that it apply comprehensive authorization rules when using the metadata format defined in this document. The below section discusses each of these aspects in more detail.
It is RECOMMENDED that a SRC authenticate the SRS using the normal SIP authentication mechanisms, such as Digest as defined in Section 22 of [RFC3261]. The mechanism used for conveying the metadata information MUST ensure integrity and SHOULD ensure confidentially of the information. In order to achieve these, an end-to-end SIP encryption mechanism, such as S/MIME described in [RFC3261], SHOULD be used.
If a strong end-to-end security means (such as above) is not available, it is RECOMMENDED that a SRC use mutual hop-by-hop Transport Layer Security (TLS) authentication and encryption mechanisms described in "SIPS URI Scheme" and "Interdomain Requests" of [RFC3261].
This document describes an extensive set of metadata that may be recorded by the SRS. Most of the metadata could be considered private data. Some implementations may have SRC choose parts of Metadata that can be sent to SRS. In other cases, SRCs may send metadata that is not appropriate for the SRS to record. What of this metadata is actually recorded by the SRS must be carefully considered (a “retention policy”) to balance privacy concerns with usability. Implementations MUST control what metadata is recorded, and MUST NOT save metadata sent by the SRC that does not conform to the retention policy of the SRS.
This specification registers a new XML namespace, and a new XML schema.
URI: urn:ietf:params:xml:ns:recording
Registrant Contact: IETF SIPREC working group, Ram mohan R(rmohanr@cisco.com)
XML: the XML schema to be registered is contained in Section 8.
Its first line is <?xml version="1.0" encoding="UTF-8"?> and its last line is </xs:schema>
We wish to thank John Elwell, Henry Lum, Leon Portman, De Villers, Andrew Hutton(Siemens-Enterprise), Deepanshu Gautam(Huawei),Charles Eckel(Cisco), Muthu Arul Mozhi (Cisco), Michael Benenson(Cisco), Hadriel Kaplan (ACME), Brian Rosen, Scott Orton(Broadsoft), Ofir Roth (NICE), Mary Barnes(Polycom), Ken Rehor(Cisco) for their valuable comments and inputs.
We wish to thank Joe Hildebrand(Cisco), Peter Saint-Andre(Cisco), Matt Miller(Cisco) for the valuable XML related guidance and Martin Thompson for validating the XML schema and providing comments on the same.
| [RFC6341] | Rehor, K., Portman, L., Hutton, A. and R. Jain, "Use Cases and Requirements for SIP-Based Media Recording (SIPREC)", RFC 6341, August 2011. |
| [RFC7245] | Hutton, A., Portman, L., Jain, R. and K. Rehor, "An Architecture for Media Recording Using the Session Initiation Protocol", RFC 7245, May 2014. |
| [RFC2648] | Moats, R., "A URN Namespace for IETF Documents", RFC 2648, August 1999. |
| [RFC3326] | Schulzrinne, H., Oran, D. and G. Camarillo, "The Reason Header Field for the Session Initiation Protocol (SIP)", RFC 3326, December 2002. |
| [RFC3325] | Jennings, C., Peterson, J. and M. Watson, "Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks", RFC 3325, November 2002. |