SIPREC Support

Session recording is utilized for various telephony purposes, such as to comply with government regulations, to monitor quality of service of representatives, and for 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 towards the recording server

The overall 

SBC SIP Recording Strategy

The 

In the above topology, 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 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 ePSX (or PSX, depending upon the configuration) 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 ePSX (or 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.

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. SBC shall display 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/ePSX 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”, SBC 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.

• SBC 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, SBC 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.

See NICE Session Recording for the list of supported codecs.

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

See zone sipSigPort - CLI and request global pages for CLI command details.