» LAWFUL INTERCEPTION RECORDER
» LAWFUL INTERCEPTION RECORDER
Lawful interception (or lawful intercept) is an action (based on the law) performed by network operators or TSPs (Telephony Service Providers), of making available certain data or voice information and providing that information to a monitoring center. Law enforcement agencies (LEA) are authorized by a law to receive the results of interceptions.
SS7 has been playing a principal role in controlling the signaling in intelligent networks for many years. This standard has been deployed globally for intelligent networks in wireline and/or wireless environments. SS7 offers a realiable source of intelligence collection. Consequently, SS7 lawful interception and tranmission of telecommunications interceptions to the monitoring center are common actions worldwide.
Telesis Stillink 3200 LIR (Lawful Interception Recorder) is a voice recorder element in monitoring center of LEAs. The applied solution is according to European (ETSI TS 101 671 V3.11.1) standards for LI (Lawful Interception). LEAs, using various network elements of multi-vendors, may consider Stillink 3200 LIR.
Stillink 3200 Lawful Interception Voice Recorder in Monitoring Center for PSTN SS7 ISUP Intercept
Stillink 3200 Lawful Interception Voice Recorder in Monitoring Center for Mobile Network SS7 ISUP Intercept
Some hallmarks of the solution are:
Information, which may be used in file naming of intercepted voice records are:
All or some of the above information may be used in file name in any sequence. Consequently, TSPs or LEAs may program their desired file naming description easily.
»» Reliability, Duplication, and Redundancy
The hardware and firmware of the Stillink 3200 LIR are reliable and fault tolerant solution for no loss of valuable intercept data. In addition, higher levels of system availability can be achieved via external redundancy and duplication as mentioned in reference models.
»»» Firmware and Processing
The advanced design of the Stillink 3200 LIR incorporates state-of-the-art Industrial CPU and Digital Signal Processors that are capable of executing hundreds of millions of instructions a second. Highly efficient use of the system`s processing power, with the help of intelligent algorithms, leaves no possibility that an overload condition will arise. In the operation of the Stillink 3200 LIR, there is a sufficient margin for overload situations. Improved speed, security, and reliability are guaranteed by the placement of the generic programs and operating parameters in non-volatile semiconductor memory elements. The Stillink 3200 LIR incorporates processing units that take full advantage of the massive amount of computing power that is now available, along with the myriad of software development tools.
The Stillink 3200 LIR is a Stored-Program-Controlled (SPC) system. Its leading-edge operational software, Xymphony, has been developed by Telesis A.S. specifically for this system. With many programmable features, Xymphony makes the lawful interception recording highly efficient. Xymphony within the Stillink 3200 LIR is well structured and is developed by a high level language of C. Xymphony software provides strategies to prevent the occurrence of programming errors to escalate to present sufficient information for quick solving of the errors. The Stillink 3200 verifies the integrity of its software at regular basis.
»»» Power System
By default, the Stillink 3200 LIR has a single solid state, high quality, robust (with high MTBF value), convectional cooling (without mechanical fans), field-proven power system. Hallmarks of this power system are:
»»» System Resources
Although some of the Stillink 3200 LIR`s common control function is implemented in a centralized manner, many resources like digital signal processors (DSPs) are distributed. Digital signal processors provide HDLC for E1 interfaces. DSP distribution provides redundancy. All available channels from all DSPs are collected in a common pool, which is ready to serve any request within the system. In other words, in case of a failure in a DSP, its functions can be handled with other DSPs in this distributed system. The expense in this method may be concurrent call recording capacity.
»»» HI3 (E1) and Ethernet Interfaces
External synchronization sourcing is programmable and multiple HI3 E1 interfaces may be candidates for sourcing. Intelligent algorithms within the Stillink 3200 LIR select the source among the available HI3 E1 interfaces. Consequently, loss of signal in an E1 interface does not necessarily cause the loss of synchronization. The Stillink 3200 LIR has multiple ethernet interfaces. The Stillink 3200 LIR continuously monitors ethernet interfaces for faults and warnings.
»»» Reference Models
Different levels of system availability can be achieved via redundancy, from duplicated FTP servers to fully redundant Stillink 3200 LIR systems and FTP servers.
»»»» Single Recorder, Single FTP
The simplest level availability is a single Stillink 3200 LIR for a HI3 and a single FTP server for the records.
»»»» Single Recorder, Dual FTPs
Stillink 3200 LIR supports dual FTP servers. If the primary server fails, voice records are exported to the secondary server. That provides a higher level of availability.
»»»» Dual Recorders, Dedicated Single FTP
It is very easy to duplicate the voice record for the HI3 E1 interface thanks to the uni-direction of HI3. Thus, it is possible to send the same voice record to two different Stillink 3200 LIRs.
»»»» Dual Recorders, Dedicated Dual FTPs
In addition to redundant Stillink 3200 LIR for the same HI3 E1 interface, duplicating FTP servers provide the maximum level of availability.
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