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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 

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supports the following SIP recording interfaces:

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

Note

NICE and Media Packet Capture cannot be used simultaneously because the Splitter resource can only be configured for one feature.

Session recording is used for various purposes such as complying with regulation, monitoring quality of service of representatives as well as storing call information for quality analysis.

The SBC Core supports the following proprietary SIP recording interfaces:

  • SIPREC SIP-based session recording
  • Call monitoring MCT
  • NICE session recording

Access to the Media Capture Tool is restricted to privileged, password-protected user accounts. Tracking of its use is tracked by AUD logging.

Note

The SBC can record all the calls in the system. The number of recording sessions depends on the available interface bandwidth.

Supported ieft-draft Versions

 Category ieft-draft Version
Media Recording Architecturedraft-ietf-siprec-architecture-06
Protocoldraft-ietf-siprec-protocol-06
Recording Metadata

Fixed version of draft-ietf-siprec-metadata-07

The overall 

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SIPREC strategy is depicted in the following diagram (this example uses SBC 5000 series platform):

SBC SIP Recording Strategy

The 

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can act as a Session Recording Client (SRC) and an RTP translator. As an SRC, the 
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initiates SIP recording session (RS) towards Session Recording server (SRS) with metadata. Unlike NICE, it is the responsibility of the
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 to determine if a call requires recording.

Note
  • The SBC supports transmitting only the signaling data to the SRS over TCP.
  • LSWU is supported for SIPREC SIP-based session recording from 5.1.1 version on-wards.

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

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and called as communication session (CS). The
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 establishes a Recording session (RS) based on CS towards SRS. The 
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and SRS may exist in the same or different administrative domains. Each 
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Recording session is mapped to a single call (communication session), and the communication session is based on called or calling party number.

The two methods to trigger a call recording are:

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

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

The PSX 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.


Note
  • If there is more than one SRS associated with the SRS Cluster, the SBC records on both the legs (Ingress and Egress). The first two recordings are on Ingress leg and the rest on Egress.
  • For Quad SIPREC, there are four recordings triggered. Two recordings are triggered on the Ingress leg and two on the Egress leg.
  • If there is more than one SRS Group configured, it is recommended to set recordingType to "both legs" or "all legs".
  • When SIPREC is selected as the Recorder Type, and Recording Type is selected as “both legs” and “all legs”, the SBC by default records the ingress leg.

Supported SIPREC features include:

  • Recording RTP session for a call by providing its GCID via CLI. The user provides the IP Address/port for the corresponding session recorder via the same CLI command.

  • Listing the calls currently being recorded using a CLI command. The

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     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.

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

  • Options Tag “siprec” in INVITE towards SRS.

  • Sending 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 recording session. So SRC shall still continue operating the CS and RS until this happens.

  • 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 recording session, 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 recording sessions.

  • 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.

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

Note

The SIPREC feature is controlled by a system-wide

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license (
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-SIPREC). If the license is not available, any SIPREC recording returned by a PSX is ignored.

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 trunkGroup <TRUNK GROUP NAME> srsIpAddress <SRS IP ADDRESS> srsPort <SRS PORT>
% request global sipRec stopRecord gcid <GCID>

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.

 

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