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Overview

Session recordings are used for various purposes such as complying with regulations, monitoring quality of service of representatives, and storing call information for quality analysis.

The SIPREC protocol defines the interaction between a Session Recording Client (SRC) and a Session Recording Server (SRS), and controls the recording of media transmitted in the context of a communications session (CS) between multiple user agents.

The 

• SIPREC SIP-based session recording
• Call monitoring MCT
• NICE session recording
• UDP/TCP towards the recording server
• SIPREC over TLS

The Recoding Session (RS) is established over SIP from SRC to SRS.

The SBC supports SIPREC towards multiple recorders based on the Internet Engineering Task Force (IETF) standard. The SBC acts as an SRC sending recording sessions to a third-party SRS when a configured recording-criteria is met. Include PageNICE_vs_MediaPacketCaptureNICE_vs_MediaPacketCapture

The overall 

Caption
0 Figure 1 SBC SIP Recording Strategy 3 SBC SIP Recording Strategy
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The 

In the SBC SIP Recording Strategy figure, the basic call is established between SIP phone 1 and SIP phone 2 through the

The two methods to trigger a call recording are:

• A call matches call recording criteria causing the Policy Server to trigger the

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  to record the call.
• Initiate recording via CLI using GCID.

In the figure SBC SIP Recording Strategy, the basic call is established between SIP phone 1 and SIP phone 2 through the SBC, which is known as communication session (CS). The SBC establishes an RS based on CS towards SRS. The SBC and SRS may exist in the same or different administrative domains. 

Caption
0 Figure 1 SBC SIP Recording Strategy 3 SBC SIP Recording Strategy
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Configuring SIPREC Based Recording

The two methods to trigger a call recording are:

• A call matches call recording criteria causing the Policy Server to trigger the SBC to record the call.
• Initiate recording via CLI using GCID.

PSX Configuration

The recording-criteria determine, which sessions to record, SRS information along with other operational options.

The PSX/ERE uses the following configurable objects when determining whether a call needs to be recorded or not:

• Recording Criteria—contain the rules to match for invoking call recording (this is same for SIPREC and MCT).
• Recorder Profile—contains information about the recorder to use for a particular Recording Entity (obsolete—used in older versions when SRS redundancy is not supported).
• Contains
• Transport
• IP V4/V6 address and port
• SRS Groups—contains multiple Recoding profiles for SRS redundancy (up to 8).
• Contains data of multiple SRS servers
• Transport
• IP V4/V6 address port
• Encryption data (for SRTP)  
• IP TG to be used by the SBC for RS session
• Recording Cluster profile—contains multiple SRS Groups for simultaneous recording (up to 4).

Recording Criteria

The need to record a call is decided from the PSX based on the following criteria The need to record a call is decided from the PSX based on the following criteria in the given order of priority:

• Recorder type
• SIPREC
• MCT
• Next hop signaling IP address
• Previous hop signaling IP address
• Calling Party Number
• Called Party number
• Ingress TG ID
• Egress TG ID
• GATEWAY

The PSX/ERE uses the following configurable objects when determining whether a call needs to be recorded:

• Recording Entity—contains information about recording criterion
• Recorder—contains information about the recorder to use for a particular Recording Entity.

For detailed configuration information, refer to the section Deploying SBC For SIPREC

CLI Triggers

• Recording RTP session can be initiated for a call by providing its GCID via through CLI. The user provides the IP Address/port for the corresponding session recorder via through the same CLI command.
• Listing the calls currently being recorded using a CLI command. The

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   displays SBC displays their GCID, and the RTP destinations and the SRS IP address.

• Record any type of call leg (SIP, SIP-I ) by specifying the call to be recorded via CLI.

• The called and calling party numbers in the recording criteria may be configured as a prefix.

• PSX support provisioning 128 Recording criteria and 128 Recorder profiles.

  • You can provision up to 256 SRS Group Profiles.
  • You can provision up to 256 SRS Cluster Profiles.
  • You can set up 128 Call Recording Criteria.

• Sending and receiving “+sip.src” feature tag extension in the Contact URI

Once SBC determines that the call must be recorded, it initiates the SIP INVITE towards the SRS specified in the recording criteria.

• Includes a “+sip.src” feature tag extension in the Contact URI
• Options Options Tag “siprec” in INVITE towards SRS.
• Two m= lines one for the Rx stream and one for the Tx stream.
• The attribute “a=label” identifies the streams in the metadata.
• Adds the RSSending and receiving the rs-call specific data in the rs-metadata XML body

• If a INVITE is received from a SRS or UE with a options tag “require: siprec”, the

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   rejects the request with a 4xx message.

• Transparently passing the SIPREC specific feature tags from the UE to the registrar.

• If the original call uses any codecs other than the above, it is assumed that the SRS will terminate the RS. So SRC continues operating the CS and RS until this happens.

• This metadata provides information on the participants of the communication session
• <gcid> the Global call ID used in the SBC
• Other SIP headers with their corresponding XML tags are added as per configuration
• Sends the SDP offer with the same Codec of the call leg that is being recorded towards the SRS.
• When the SRS replies with its media IP/port information in a 200 OK, the SBC transparently The

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   transparently duplicates the packets coming/going to the UE towards the SRS using the same Codec as the Original stream.

• If any request except session keepalive Re-INVITE/UPDATE or BYE is received in the context of a RS, the

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   rejects the request with a 405 "Method Not Allowed" message.

• If Options PING mechanism is configured on the IP peer, it is used as a keep-alive mechanism for all the RSs.

• Stop recording a call in one of three ways:
  • Providing GCID via CLI
  • Via normal CS Sessions disconnect
  • Receiving Bye from SRS

• Troubleshooting a SIPREC recorded call using MCT is only possible when initiated via CLI. 

• The SBC supports SIPREC on the multiple recorders based on the Internet Engineering Task Force (IETF) standard.The SBC acts as an SRC and a Real-time Transport Protocol (RTP) to initiate SIP RS on the SRS(s).

  • Once the recording criteria are met, the SBC receives SRS IP group along with the number of streams (one or two) from the ERE.
  • The SRS IP group contains a maximum of eight SRS IP addresses along with the Trunk Group and the transport information, which the ERE sends (either round-robin or sequential).
  • The SBC decides the type of INVITE message to be sent to SRS based on:
    
    • If the value of the parameter for numOfStreams received is 1, the SBC sends the INVITE to the first reachable SRS IP address and uses the rest of the IP addresses for SRS redundancy.
    • If the value received is 2, the SBC sends the Fork INVITE to the first two reachable SRS IP addresses.
  • Once the SRS IP sends the response, the SBC starts streaming media towards the SRS.
    

Refer to NICE Session Recording for the list of supported codecs.

Info
title Note
The SBC does not support transcoding towards the SRS. If the SRS replies back with any other codec, the recording session continues until the SRS terminates the call on its own.

 

Info
title Note
The SBC does not support “Recording Aware UEs” If an INVITE is received from UE with a options tag “require: siprec”, the SBC rejects the request with a 4xx message. The SBC does not support SRS initiated recording If an INVITE is received from an SRS with a options tag “require: siprec”, the SBC rejects the request with a 4xx message. If any request except session keepalive re-INVITE/UPDATE or BYE is received in the context of an RS, the SBC rejects the request with a 405 "Method Not Allowed" message.

For configuring SIPREC feature, refer to the section Deploying SBC For SIPREC.

Info
title Note
The SBC stops recording a call in one of the three ways: Providing GCID through CLI recording STOP command Through normal CS Sessions disconnect Receiving BYE from the SRS

Supported Features

The SBC supports following SIPREC features:

• The SIPREC is supported on UDP, TCP, and TLS protocols.
• The SBC supports recording SIP and SIP-I calls.
• If Options PING mechanism is configured on the IP peer, it is used as a keep-alive mechanism for all the SRSs.
• Troubleshooting a SIPREC recorded call using MCT is only possible when initiated through CLI.
• SRS Redundancy
• Simultaneous recording
• Dynamically programmable metadata content
• The SBC records the SIPREC recording information in the CDR.
  

To enable/disable SIPREC feature, use following syntax:

% set addressContext <ADDRESS-CONTEXT> zone <ZONE> sipSigPort <SIP SIGNALLING PORT> siprec <disabled|enabled>

To start/stop a recording, the following CLI syntax applies:

% request global sipRec startRecord gcid <GCID> callLeg ingress numOfStreams <Number of recorders  1 or 2> srsIpAddress <SRS IP ADDRESS> srsPort <SRS PORT> transport <tcp | udp> trunkGroup <TRUNK GROUP NAME> srsIpAddress2 <SRS IP ADDRESS> srsPort2 <SRS Port> transport2 <tcp | udp> trunkGroup2 <SIP Trunk Group> 
% request global sipRec stopRecord gcid <GCID> recorderAddress <IP Address> recorderPort <Port Number>

To view SIPREC status, use CLI syntax:

> show table global SipRecStatus
       RECORDER           RX RTP            TX RTP            RECORDING  
GCID   ADDRESS            ADDRESS           ADDRESS           LEG
1      10.11.12.13:5060   10.11.12.13:8000  10.11.12.13:8002  ingress

Refer to Zone - SIP Sig Port - CLI and Request Global - CLI pages for CLI command details.

SRS Redundancy

The SBC is enhanced to support simultaneously recording SIP egress and ingress legs during a session, for a total of four recordings (four simultaneous streams: two in the ingress leg, and two in the egress leg). The following are unique recording servers identified by different IP ports:

• Primary SRS
• Secondary SRS
• Biometric
• Analytics

The SBC provisions the SIPR recordings towards all 4 recorders, two from Ingress tap point and another two from egress tap point. (Due to NP limitations, four simultaneous recordings cannot be triggered on the same call leg.)

Basic Quad SIPREC

Below is a diagram illustrating the use case of Quad SIPREC, with first two recordings on Ingres call-leg, and the next 2 recordings on egress call-leg.

For more information on parameter configurations and CDR field descriptions refer to:

CLI and EMA:

• Request Global - CLI
• Servers - SRS Group Profile - CLI
• Servers - Call Recording Criteria - CLI
• Servers - SRS Group Profile - CLI
• Zone - SIP Sig Port - CLI
• Global - SIPrec
• Global - Servers - Srs Group Profile

Alarms:

• sonusSbxSipRecSrsSelectionFailedNotification - MINOR
• sonusSbxSIPRecLicenseNotAvailable - MINOR

CDR:

• CDR Field Descriptions

SRTP Support for SIPREC Towards SRS

The SBC is enhanced to support sending encrypted media streams (Secure Real-Time Transport Protocol (SRTP)) towards the SIPREC recorders.

• The SBC sends the SRTP streams as received from the endpoints.
• The SBC is configured to perform a different encryption (using dedicated crypto suite profile) towards the Session Recording Server (SRS).
• The SBC is configured to send plain RTP packets even when the original Communication Session (CS) is an SRTP call.

With this feature, the SBC:

• Supports SRTP (encrypted streams) towards SIPREC server.
• Provides SIPREC functionality with SRTP calls.
• Provides flexibility by supporting both SRTP or RTP towards the SRS based on the input control in the srsGroupData.
• Supports sending SRTP packets (encrypted media streams) as received from the endpoints (relay/pass-through).
• Supports sending SRTP packets with different encryption techniques using new crypto suite profile configured in the srsGroupData.
• Provides support to terminate original SRTP call at the SBC for the SIPREC, such that:
  • The encrypted media packets are decrypted at the SBC and are re-encrypted again towards the user endpoint using the negotiated crypto suite profile (CS) between the SBC and the UE.
  • The decrypted media packets towards SRS can be:
    • Encrypted using the same CS negotiated crypto suite profile.
    • Encrypted using different crypto suite profile as provided by the srsGroupData.
    • Send decrypted media packets (RTP) only towards SRS based on the configuration (CS crypto is ignored).

The following two options are added to the srsGroupData:

• srtp: Specifies whether SRTP is enabled for the SRS or not.
• cryptoSuiteProfile: If SRTP is enabled, encrypt recording session using this crypto details.

When SRTP is disabled for the SRS, the SBC sends unencrypted streams towards the SRS irrespective of the CS is using RTP or SRTP.

When SRTP is enabled for the SRS and if the CS leg that is recorded is not using SRTP:

• If cryptoSuiteProfile is configured for the SRS, the SBC sends the SRTP packets using the cryptoSuiteProfile on the recorded leg towards the SRS. 
   
• If cryptoSuiteProfile is not configured for the SRS, the SBC sends the RTP packets. 

When the CS is using SRTP pass-through:

• If the call is recorded and SRTP is enabled for the SRS, the SBC relays the SRTP packets as recevied from the user endpoint.
• If SRTP is enabled for the SRS and cryptoSuiteProfile is configured, the SBC re-encrypts the media using the configured cryptoSuiteProfile.
  

When the CS is an SRTP terminated call:

• If cryptoSuiteProfile is configured for the SRS, the SBC sends the SRTP packets using the cryptoSuiteProfile on the recorded leg towards the SRS. 
  
• If cryptoSuiteProfile is not configured for the SRS, the SBC uses the cryptoSuiteProfile from the CS and sends SRTP packets.

SIPREC RFC Compliance Support for Dynamically Programmable Metadata Content

The SBC supports SIPREC when the SIPREC specifications were in early drafts (draft-ietf-siprec-xx-06). With the implementation of this feature, the SIPREC standard has evolved to RFCs (RFC 7245, RFC 7865, RFC 7866, and RFC 8068), and provides capability for supporting "dynamically programmable" selection of metadata content.

• The profile sipRecMetaDataProfile is introduced to the services to provide the capability to configure the headers that are mapped from the target call leg to the XML and the corresponding metadata XML element name.
• In case of a basic call, all information is copied from the initial-INVITE message on the leg where the tap is, to the metadata XML. However, "To" header and "to-tag" is copied additionally from the local information (as to-tag does not present in the INVITE).
• In case of SIPREC trigger during REFER based transfer, irrespective of where the SIPREC tap is, all information is copied from the initial-INVITE of the new call leg towards the transfer target (C party).
• In case of CLI triggered recording, the existing implementation of sending predefined information in metadata XML remains same (gcid, call-id, from, to). The new configuration of header-metadata mapping is not considered in this scenario.

supports the concept of Primary and secondary SRS servers for redundancy. It supports multiple (up to 8) SRS servers in a SRS Group. All of them can be active at any point of time.

• The SBC can load balance among the recorders in the SRS Group in sequential or round-robin fashion.
• The SBC also supports crank-back mechanism where it tries the next SRS if an SRS does not respond to the RS INVITE or rejects the RS INVITE with a 4xx.
• The SBC also maintains the health check of the SRS servers using Options PING. If an SRS is marked not reachable, the SBC automatically uses the next server in the SRS group for the next RS session.

Simultaneous Session Recording - SIP Ingress and Egress Legs

The SBC is enhanced to support simultaneously recording SIP egress and ingress legs during a session, for a total of four recordings (four simultaneous streams: two in the ingress leg, and two in the egress leg).

The SBC provisions the SIPR recordings towards all 4 recorders, two from Ingress tap point and another two from egress tap point. (Due to NP limitations, four simultaneous recordings cannot be triggered on the same call leg.)

Example of Simultaneous Session Recording

Below is a diagram illustrating the use case of a simultaneous SIPREC, with first two recordings on Ingres call-leg, and the next 2 recordings on egress call-leg.

For more information on parameter configurations and CDR field descriptions refer to:

CLI and EMA:

• Request Global - CLI
• Servers - SRS Group Profile - CLI
• Servers - Call Recording Criteria - CLI
• Servers - SRS Group Profile - CLI
• Zone - SIP Sig Port - CLI
• Global - SIPrec
• Global - Servers - Srs Group Profile

Alarms:

• sonusSbxSipRecSrsSelectionFailedNotification - MINOR
• sonusSbxSIPRecLicenseNotAvailable - MINOR

CDR:

• CDR Field Descriptions

SRTP Support for SIPREC Towards SRS

The SBC is enhanced to support sending encrypted media streams (Secure Real-Time Transport Protocol (SRTP)) towards the SIPREC recorders.

• The SBC sends the SRTP streams as received from the endpoints.
• The SBC is configured to perform a different encryption (using dedicated crypto suite profile) towards the Session Recording Server (SRS).
• The SBC is configured to send plain RTP packets even when the original Communication Session (CS) is an SRTP call.

With this feature, the SBC:

• Supports SRTP (encrypted streams) towards SIPREC server.
• Provides SIPREC functionality with SRTP calls.
• Provides flexibility by supporting both SRTP or RTP towards the SRS based on the input control in the srsGroupData.
• Supports sending SRTP packets (encrypted media streams) as received from the endpoints (relay/pass-through).
• Supports sending SRTP packets with different encryption techniques using new crypto suite profile configured in the srsGroupData.
• Provides support to terminate original SRTP call at the SBC for the SIPREC, such that:
  • The encrypted media packets are decrypted at the SBC and are re-encrypted again towards the user endpoint using the negotiated crypto suite profile (CS) between the SBC and the UE.
  • The decrypted media packets towards SRS can be:
    • Encrypted using the same CS negotiated crypto suite profile.
    • Encrypted using different crypto suite profile as provided by the srsGroupData.
    • Send decrypted media packets (RTP) only towards SRS based on the configuration (CS crypto is ignored).

The following two options are added to the srsGroupData:

• srtp: Specifies whether SRTP is enabled for the SRS or not.
• cryptoSuiteProfile: If SRTP is enabled, encrypt recording session using this crypto details.

When SRTP is disabled for the SRS, the SBC sends unencrypted streams towards the SRS irrespective of the CS is using RTP or SRTP.

When SRTP is enabled for the SRS and if the CS leg that is recorded is not using SRTP:

• If cryptoSuiteProfile is configured for the SRS, the SBC sends the SRTP packets using the cryptoSuiteProfile on the recorded leg towards the SRS. 
   
• If cryptoSuiteProfile is not configured for the SRS, the SBC sends the RTP packets. 

When the CS is using SRTP pass-through:

• If the call is recorded and SRTP is enabled for the SRS, the SBC relays the SRTP packets as recevied from the user endpoint.
• If SRTP is enabled for the SRS and cryptoSuiteProfile is configured, the SBC re-encrypts the media using the configured cryptoSuiteProfile.

When the CS is an SRTP terminated call:

• If cryptoSuiteProfile is configured for the SRS, the SBC sends the SRTP packets using the cryptoSuiteProfile on the recorded leg towards the SRS. 
  
• If cryptoSuiteProfile is not configured for the SRS, the SBC uses the cryptoSuiteProfile from the CS and sends SRTP packets.

Dynamically Programmable Metadata Content

The SBC supports SIPREC when the SIPREC specifications were in early drafts (draft-ietf-siprec-xx-06). With the implementation of this feature, the SIPREC standard has evolved to RFCs (RFC 7245, RFC 7865, RFC 7866, and RFC 8068), and provides capability for supporting "dynamically programmable" selection of metadata content.

• The profile sipRecMetaDataProfile is introduced to the services to provide the capability to configure the headers that are mapped from the target call leg to the XML and the corresponding metadata XML element name.
• In case of a basic call, all information is copied from the initial-INVITE message on the leg where the tap is, to the metadata XML. However, "To" header and "to-tag" is copied additionally from the local information (as to-tag does not present in the INVITE).
• In case of SIPREC trigger during REFER based transfer, irrespective of where the SIPREC tap is, all information is copied from the initial-INVITE of the new call leg towards the transfer target (C party).
• In case of CLI triggered recording, the existing implementation of sending predefined information in metadata XML remains same (gcid, call-id, from, to). The new configuration of header-metadata mapping is not considered in this scenario.

The following call flow diagram displays the XML tag name.

Example SIP INVITE

The following is an example of SIP INVITE:

INVITE sip:SIPREC-SRS@10.54.80.8:51802 SIP/2.0
Via: SIP/2.0/UDP 10.34.171.39:5060;branch=z9hG4bK00B00021f4cdc2590c2
From: "SIPREC-SRC" <sip:SIPREC-SRC@10.34.171.39>;tag=gK00000237
To: "SIPREC-SRS" <sip:SIPREC-SRS@10.54.80.8>
Call-ID: 35651585_16777218_133945398@10.34.171.39
CSeq: 787532 INVITE
Max-Forwards: 70
Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,MESSAGE,PUBLISH
Accept: application/sdp, application/rs-metadata-request,application/rs-metadata
Contact: "SIPREC-SRC" <sip:SIPREC-SRC@10.34.171.39:5060>;+sip.src
Require: siprec
Supported: timer,100rel
Session-Expires: 1800
Min-SE: 90
Content-Length:  4560
Content-Type: multipart/mixed;boundary=sonus-content-delim
MIME-Version: 1.0

--sonus-content-delim
Content-Disposition: session; handling=required
Content-Length:   296
Content-Type: application/sdp
v=0
o=Sonus_UAC 748003 60371 IN IP4 10.34.171.39
s=SIP Media Capabilities
t=0 0
m=audio 1028 RTP/AVP 0
c=IN IP4 10.34.171.39
a=label:1
a=rtpmap:0 PCMU/8000
a=sendonly
a=maxptime:10
m=audio 1026 RTP/AVP 0
c=IN IP4 10.34.171.39
a=label:2
a=rtpmap:0 PCMU/8000
a=sendonly
a=maxptime:10

--sonus-content-delim
Content-Disposition: recording-session
Content-Length:  3976
Content-Type: application/rs-metadata+xml

<?xml version="1.0" encoding="UTF-8"?>
<recording xmlns='urn:ietf:params:xml:ns:recording:1'>
    <datamode>complete</datamode>
    <group group_id="OTIxYzk4MDAtN2RkYy0xMA==">
        <associate-time>2018-08-09T08:31:44Z</associate-time>
        <callData xmlns='http://ribboncommunications.com/siprec/calldata'>
            <xTo>&lt;sip:+1999@10.54.80.8:51801;user=phone&gt;;tag=1</xTo>
            <xVia>SIP/2.0/UDP 10.34.171.34:5060;branch=z9hG4bK00B0000a25afeb7eee5</xVia>
            <xCSeq>844797 INVITE</xCSeq>
            <xFrom>"sipp" <sip:sanrayana@10.34.171.34>;tag=gK0000011e</xFrom>
            <xContentType>application/sdp</xContentType>
            <xMaxForwards>70</xMaxForwards>
            <srsgrpId>GR1</srsgrpId>
            <xAcceptContact>*;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel"</xAcceptContact>
            <xPPreferredIdentity>"sipp" <sip:sanrayana@10.54.80.8:5061></xPPreferredIdentity>
            <mprofileVers>v1.0</mprofileVers>
            <gcid>35651585</gcid>
        </callData>
    </group>
    <session session_id="OTIxYzlhM2UtN2RkYy0xMA==">
        <group-ref>OTIxYzk4MDAtN2RkYy0xMA==</group-ref>
        <start-time>2018-08-09T08:31:44Z</start-time>
    </session>
    <participant participant_id="OTIxYzk4MDEtN2RkYy0xMA==">
        <nameID aor="sanrayana@10.34.171.34:5060">
            <name xml:lang="en">sipp</name>
        </nameID>
    </participant>
    <participant participant_id="OTIxYzk4MDItN2RkYy0xMA==">
        <nameID aor="+1999@10.54.80.8">
            <name xml:lang="en"> </name>
        </nameID>
    </participant>
    <stream stream_id="OTIxYzk4MDQtN2RkYy0xMA==" session_id="OTIxYzlhM2UtN2RkYy0xMA==">
        <label>1</label>
        <associate-time>2018-08-09T08:31:44Z</associate-time>
    </stream>
    <stream stream_id="OTIxYzk4MDUtN2RkYy0xMA==" session_id="OTIxYzlhM2UtN2RkYy0xMA==">
        <label>2</label>
        <associate-time>2018-08-09T08:31:44Z</associate-time>
    </stream>
    <sessionrecordingassoc session_id="OTIxYzlhM2UtN2RkYy0xMA==">
        <associate-time>2018-08-09T08:31:44Z</associate-time>
    </sessionrecordingassoc>
    <participantsessionassoc participant_id="OTIxYzk4MDEtN2RkYy0xMA==" session_id="OTIxYzlhM2UtN2RkYy0xMA==">
        <associate-time>2018-08-09T08:31:44Z</associate-time>
    </participantsessionassoc>
    <participantsessionassoc participant_id="OTIxYzk4MDItN2RkYy0xMA==" session_id="OTIxYzlhM2UtN2RkYy0xMA==">
        <associate-time>2018-08-09T08:31:44Z</associate-time>
    </participantsessionassoc>
    <participantstreamassoc participant_id="OTIxYzk4MDEtN2RkYy0xMA==">
        <send>OTIxYzk4MDQtN2RkYy0xMA==</send>
        <recv>OTIxYzk4MDUtN2RkYy0xMA==</recv>
    </participantstreamassoc>
    <participantstreamassoc participant_id="OTIxYzk4MDItN2RkYy0xMA==">
        <send>OTIxYzk4MDUtN2RkYy0xMA==</send>
        <recv>OTIxYzk4MDQtN2RkYy0xMA==</recv>
    </participantstreamassoc>
</recording>

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