These Application Notes describe the configuration steps required for Sonus Session Border Controller (SBC) to interoperate with the SIP recording server (NICE server) using SIP trunks. Sonus SBC is a robust solution that integrates security, call control, Quality of Service, advanced media services and switching, all within a compact platform. The SBC functionality is compliance tested utilizing a SIP trunk to NICE recorder.
The objective of this document is to describe the procedure to be followed during IOT of SBC with NICE recorder. This includes identifying the test environment, tools required for testing, network topology, test points, risks involved in testing and scope of the testing.
The interoperability compliance testing focuses on verifying inbound and outbound call flows between Sonus SBC and the NICE recorder using TCP.
This is a technical document intended for telecommunication engineers with the purpose of configuring both the Sonus SBC and the third-party product. Navigating the third-party as well as the Sonus SBC Command Line Interface (CLI) is required. Understanding the basic concepts of TCP/UDP, IP/Routing and SIP/RTP are also required to complete the configuration and any necessary troubleshooting.
Session recording is a capability which can be utilized for various purposes: to comply with regulation, to monitor quality of service of representatives and to store call information for quality analysis. Sonus SBC currently supports proprietary SIP recording interfaces like NICE and MCT. This feature aims to support IETF standard SIP recording interfaces, namely SIPREC (SIP recording).
As per SIPREC architecture, SBC acts as Session Recording Client (SRC) and acts as RTP translator. The NICE recorder acts as a Session Recording Server (SRS). As a SRC, SBC initiates SIP recording session (RS) towards Session Recording server (SRS).
The following equipment and software are used for SIPREC configuration.
Equipment Software Version Sonus SBC V05.01.01-R000 Third-party Equipment NICE NICE recorder 4.1.47
NICE recorder 4.1.47
The following reference configuration shows connectivity between the NICE recorder and the Sonus SBC.
For any questions regarding this document or the content herein, please contact your maintenance and support provider.
This section provides a look at the NICE recorder configuration used during compliance testing. The NICE recorder is typically configured for customers by NICE. The screen shots and partial configuration shown below, supplied by NICE, are provided only for reference.
This section describes NICE components.
• CAPIC (CAPI Gate Interaction Correlator): A NICE component that correlates and combines the data of calls from different switches. The CAPIC is located on the same machine as the Interactions Center.
• NICE Interactions Center: The NICE Interactions Center receives the call status, monitors call events, and stores them in its database for other system functions such as queries, reports, etc. and uses them when interaction-based recordings are implemented to determine whether to record a call.
• NICE VoIP Logger: A Logger that was set up for Active Recording and is used in an Active VoIP Recording environment. The NICE VoIP recording solution enables customers to effectively capture, evaluate, analyze and improve multimedia interactions taking place on an IP network. It provides VoIP recording solutions to customers that are deploying IP telephony networks, enabling them to enhance customer experience management over converging networks. Once the VoIP audio is recorded, it can be saved, archived, queried, and played back as easily as analog or digital recorded audio.
• Voice Recording SIP Proxy (VRSP): The VRSP functions as a SIP Proxy. It is used to set up SIP-based calls between the SBC and the NICE VoIP Logger. It is recommended to deploy VRSP redundancy in order to guarantee recording.
All configuration of VRSP, CAPIC, NICE Interaction center and CAPIC is done by NICE.
The interaction between the Sonus SBC and the NICE recorder is described below.
• The SBC receives an incoming call and queries PSX for route.
• The SBC sends an INVITE to the VRSP.
• The VRSP sends the SBC a 200 OK SIP response with the Logger’s SDP.
• The SBC routes the RTP streams to the Logger and recording starts.
• The VRSP sends a START message to the CAPIC (via the CTI Driver). The START message contains the UDI and UCID for the call.
• The CTI server (AES/TSAPI) sends an ESTABLISHED event to the CAPIC (via the CTI Driver). The ESTABLISHED event contains the DN, UCID and other call details (e.g., Call ID, participants, etc.).
• The CAPIC correlates the calls received from the VRSP and CTI server. The correlation is performed based on the UCID in both calls.
• The CAPIC sends the Interactions Center the correlated interaction, including the relevant UDI and DN received from the VRSP and the CTI server.
Currently, NICE recorder supports three redundancy methods:
SBC can use the SIP session timer method to detect that a SRS recording session failed. SRC may use non supported SIP methods to detect failures by accepting “Non implemented” response.
Currently, we support the Active/Standby with fail over model.
For enabling NICE recorder for recording:
Step 1: STOP CTI services (yellow icon in the system tray with CTI letters > right-click > StopNICE Integrations Dispatch service).
Step 2: Remove all log file under D:\Program Files\NICE Systems\CTI\Log (skip the files, which are in use).
Step 3: START CTI services (yellow icon in the system tray with CTI letters > right-click > StopNICE Integrations Dispatch service).
After 3 minutes initiate a call now call should be recorded
Ensure 'TCPConnectionClientCAPI.dll, TCPServerAPI.dll' files are present at D:\Program Files\NICE Systems\CTI\ in Nice server (present by default) for recording on TCP.
To play back recorded message.
This section provides a look into the Sonus SBC configuration used during compliance testing. The Sonus SBC is typically configured for customers by Sonus Networks. The screen shots and partial configuration shown below, supplied by Sonus Networks, is provided only for reference. Other configurations are possible.
SIPREC features normally use PSX/EPSX for routing. We must make a separate TG with separate zone and sipSigport and attach that to egress IP interface group. This sip trunk is toward NICE recorder.
In PSX, we must configure RECORDER PROFILE and CALL RECORDING CRITERIA along with Basic call configuration. Below are the additional/ special configuration fields required apart from Basic PSX configuration.
Apart from Basic configuration, the following configuration is required.
1. Recorder Profile: Provide NICE recorder, primary and secondary IPV4 or IPV6 address and port (5060). Also, mention the NICE TG name. The name of NICE TG created in SBC and PSX should be the same, otherwise recording would not be initiated toward NICE. Transport type must be set to TCP.
2. Call Recording Criteria: Provide call criteria for recording which you wish to record, like calling number, called number, ingress and egress TG, SBC name, the leg you want to record, either ingress or egress. Recorder type should be “SIPRec”. Enable the criteria. When a call is made, it shall be recorded if it falls under criteria.
All recorder information is known to SBC via PSX/EPSX.
1. Use the following commands to configure the SIP Trunk Group on SBC.
2. Configure Trunk Group on PSX (Same names must be given to TG as above in PSX).
3.Use the following commands to configure the SIP Trunk Group for NICE RECORDER on SBC.
4. Configure Trunk Group on PSX for NICE RECORDER (Same names must be given to TG as above in PSX).
This section provides the tests that are performed to verify configuration of the NICE recorder as SIPREC server and the Sonus SBC.
The following table lists a summary of the cases tested.
Sl No ID Test Case P/F CQ 1 894177 Start/Stop a call recording via CLI - Call with GCID exists in Communication session and NICE SRS IPV4 Address in TCP P 2 894186 PSX shall allow the called and calling party numbers in the recording criteria to be configured as a prefix P 3 894187 Verify recording of session before/after consultative transfer Using REFER P 4 894188 Verify recording of session for a call transcoded at ingress P 5 894189 SDP shall include the same Codec as being used original communication Session P 6 894190 Re-negotiation of codec in CS - Pass through Initially and transcoded after re-negotiation through ReInvite P 7 894191 Re-negotiation of codec in CS - Pass through Initially and transcoded after re-negotiation through UPDATE P 8 894192 In call forwarding unconditional, If C comes under recording criteria P 9 894201 If the original call is forwarded No answer. If new call comes under recording criteria . P 10 894202 REFER is received in the context of a recording session P 11 894219 IP interworking scenarios P 12 894220 Direct Media scenario P 13 894221 SIP-I to SIP-I call scenario P 14 894222 Re-negotiation of codec in CS - Pass through Initially and transcoded after re-negotiation through ReInvite with mismatch codecs. P 15 894223 Session terminate by calling party which is not in recording criteria.Test case description P 16 894224 UE initiating call with \'Supported: siprec\' header P 17 894225 A-party uses codec that are not supported in the SRS TG. P 18 894226 Call hold scenario for Rx Stream P 19 894227 Call hold scenario for Tx Stream P 20 895062 To confirm SBC initiates SIP-REC session in TCP for a call that is established with UDP as transport. P 21 895063 To Verify the recording session established in ipv6 when communication session is established in ipv4 P 22 895064 To verify the recording session for an inband DTMF call P 23 895065 To verify the recording session for an rfc2833 call P 24 895066 To verify the recording session for an dtmf relay call. F SBX-49451 25 895067 To confirm the recording for G711 Fax Passthrough call. P 26 895069 Recording for a call involving fall back from transcode to passthru with re-invite P 27 895070 To verify the recording for early media case with PRACK at ingress and egress including 200 ok with different sdp P 28 895071 Fall back from direct media to passthru in a call transfer scenario with SIPREC P 29 895072 Fall back from passthru to direct media in a call transfer scenario with SIPREC. P 30 895073 Session refresh with UPDATE involving session recording P 31 895074 To confirm a sip recording for a basic TLS/SRTP call P 32 895075 Sip recording for a TLS call involving the change in cryptosuite P 33 895076 A Basic call including srtp on one side and rtp on the other side with sip recording P 34 895077 A Basic call with indialog notify with xml body sent form UAC. P 35 895078 An indialog Info and message with xml body sent from uas to uac. P 36 895079 A Basic call involving 302 re-direction from target number with siprec. P 37 895080 A Basic call involving 302 re-direction to target number with siprec. P 38 895081 A basic call with rtcp flag enabled on both ingress and egress including sip recording. P 39 895082 Basic call including late media with siprec. P 40 895174 A Basic video call with audio recording. P 41 895175 Fall back of a video call to audio call through RE-INVITE P 42 895176 Audio call upgraded to Video through re-invite with audio recording P 43 895177 siprec Failover from primary to secondary recording server. P 44 895178 siprec call with call duration set for a specific time in PSX. P 45 895179 Call recording based on trunk group. P 46 895181 Transport protocol for recording is configured as TCP in PSX where as its not configured in SBC sipsigport P 47 895187 Basic call with LI (which uses splitter) simulator and SIP Recording where LI taking the priority. P 48 895189 Performing switch over while a call is being recorded. P 49 897948 A Basic GW-GW call with sip recording P
This Application Notes describe the configuration steps required for Sonus SBC to successfully interoperate with SIPRec server - NICE recorder. All feature and service test cases have been completed and passed with the exceptions/observations noted in Section Phase III- Inter op testing.