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Communications Recording And Archiving Devices

These devices have been developed for recording, documenting, transporting archiving and retrieving video, voice and data communication together with their detailed call data records. These devices are constructed to fulfil easily the customer’s requirements on a flexible way. Devices cover all application possibilities from the stand-alone low and medium capacity units to the centralized applications using transport facilities of the existing hierarchical network. The system consists of two basic types.
  • Individual recorders; containing high storage capacity for stand-alone operation. PC based and non PC-based devices can also be used.
  • Centralized recorders; without local storage capacity (only limited capacity to bridge network disturbances)

General features of all Hungarocom
communication recording solutions

  • Simultaneous recording and playback is possible
  • The communication information are stored on an encrypted way
  • Voice and call data are stored in the same file with an inseparable way
  • The recorded data is guarded against manipulation and sabotage by an „electronic signature”
  • Filtering of information according to the customer’s need
  • Export possibility of the recorded information in standard WAV file
  • The connection possibility of the devices via LAN or WAN
  • Remote centralised operation and maintenance of the devices
  • Connection possibility to centralised data base servers and centralised storages

Individual

The main characteristics of the individual communications recording devices are the small capacity, the autonomous, or network-based operation to form even a decentralized nation-wide system in case of demand.

The CRU-2AN analogue recorder with two symmetrical analogue inputs belongs to this category. This device is a general purpose one but it can favourably be used e.g. voice recording of TETRA dispatcher workstations.

The PcmMon device is capable to record the full traffic of two E1 channels. It is applicable for communications recording of ISDN PABXs (PRA) trunks furthermore links with CCS7 signalling systems. These devices are able to operate both autonomously and in network configuration.

A special version of the GSM-Kombi device can be used to record IP communications.

General Introduction

The CRU-2AN is a small sized, IP based, two-channel voice recording system with two symmetrical analogue line inputs and two microphone inputs. CRU-2AN is designed for recording the voice communication of TETRA DWS, but it also can be used as a general voice recorder in wide area. With an optional cable, which can be connected to TMR880 desktop radio handset’s front connector it also can record the TMR880’s voice communication (if recording of call related information and SDS messages is required see our CRU-1 product in the TETRA APPS). Using the CRU2-AN’s microphone inputs beside the DWS voice recording the voice surveillance of the dispatcher's room is also possible.

The device works at very low power consumption (<1W) and can record of the voice communication of two DWSs simultaneously because the CRU2-AN has two separated logical voice recorders. As a special feature the equipment can be configured as a stereo voice recorder and can record the two directions of a call into a stereo file as left/right channels.

The functional block diagram of the CRU-2AN is shown below.

functional block diagram

The CRU-2AN can be configured and set up by its client application (CRU-2AN-PC software). This client application can run under WINDOWS 2000/XP/VISTA on any Pentium 4 (or on of >1GHz Pentium 3) configuration. No special requirements are needed.

Operation Details

There are two available basic types of recording. On one hand, the CRU-2AN can record using its SD cards independently. The applied file system is FAT32, so removing the SD cards and inserting them into a card reader the records can easily be carried for a PC and can be copied and listened under WINDOWS. The device automatically selects the available card so it is possible to remove a full SD card while the other one is active. On the other direct recording on the PC’s HDD is also possible with the client application. Furthermore parallel recording on the CRU-2AN’s SD card and on the client PC’s HDD can also be set up. With the client application the inputs can be listened in real-time (independently from the recording). The recorded files can be played back with the client application. Two types of playback are possible: local or remote. Local playback can be used to play the records stored on the PC’s HDD or stored on the inserted SD card. Remote playback is used when the SD card is not removed from the CRU-2AN. In this case the files can be played through the IP connection. The playback does not disturb the existing recording (simultaneous recording and playback on the SD card). In the client application the current status of the SD cards are shown: active recordings, number of records, available free space, SD card operation status, etc. The recording can be continuous or VOX triggered. A high efficient adaptive voice detector is implemented for both channels. On the SD card circle recording can be set up. In this case the device handles the two SD card like one storage, and in case of full SD cards the oldest files are deleted automatically.

Audio File Format, Protection

The audio data is stored in a vendor specific encrypted and electronically signed format. The files can be carried and copied under windows with the file manager because the files are standard FAT32 files. The content is specific and is protected with electronic sign. The playback is possible with the client application. The client application verifies the electronic sign and decodes the applied encryption. From the client application all the files can be exported into standard „wave” files and after this, files can be played with a standard media player.

On demand, the format on the SD card can be changed into standard WAVE format. In this case the records on a removed SD cards can be listened without any client program activity. No additional client program is required (only for set up). The configuration is stored in the CRU’s flash memory).

The exact time stamps of the start and the end date/time of a speech communication (VOX trigger begin/end) are attached inseparably to the speech content.

Other Technical Parameters

  • Two microphone input with 0-50dB adjustable gain and +30dB selectable with jumper
  • Two symmetrical (balanced) line inputs towards DWS recording output or other audio sources. Maximum acceptable level is +6dBm. 0-50dB adjustable gain can be applied
  • Independent automatic gain controls for both channels
  • Two independent voice activity detectors
  • Selectable sampling frequency (8KHz, 16KHz, 24KHz) , 8KHz is recommended for DWS recording
  • 1x stereo or 2x mono operation modes
  • Low power consumption (<1W)
  • 10/100Mbps ethernet connection
  • Applicable SD cards: 1GB, 2GB SD, 4GB, 8GB, 16GB SDHC or UltraII cards
  • Interoperation with Hungarocom’s centralized archive recording system (optional)
  • High storage capacity: with two 16GB micro SDHC card and with 8KHz sampling frequency the capacity is about 45 day continuous speech

The picture of the device is shown on the next Figure.

CRU-2AN
A typical menu of the client application is shown on the figure below.

client application

„PcmMon” two channel E1 line
monitoring and recording equipment
(Product code: CYP-201-PCMMON)

Hungarocom’s CYPCOM equipment family
general description

The Hungarocom’s CYPCOM equipment family can offer different functions on, or between E1 and IP lines like bridge, media converter, E1 over IP, IP over E1, with encryption and different monitoring recording functions. These functions are based on two types of application specific core hardware units:
  • CYPCOM-200 hardware has eight Ethernet interfaces and two E1 PCM interfaces (RJ-45)
  • CYPCOM-201 hardware has two Ethernet interfaces and four E1 PCM interfaces (RJ-45)

The common parameters of both versions are: 230V or 48V (12V optional) operation, 1 unit high standard rack construction, high protected equipment box with key (no screws outside), high speed low power consumption core module, upgradable firmware, physical alarm contacts. There are 75/120 ohm or high impedance E1 connections. Central remote management is available for all applications.

Based on these flexible core hardware modules Hungarocom provides FoD (Function on Demand) service. That means, in case of customer’s special function or feature requirements Hungarocom can develop the unique features within short time.

„PcmMon” key features

The „PcmMon” equipment is developed for intelligent monitoring of E1 lines. Based on Hungarocom’s CYPCOM-201 core hardware, the equipment has four E1 inputs (PCM Rx). To monitor one E1 line requires two E1 Rx channels, so the hardware can monitor two full duplex E1 PCM lines. E1 Rx lines connect to the E1 lines with high impedance without disturbing the original traffic. The received E1 signal is analysed and processed by the CYPCOM-201’s internal CPU in real time (HDLC frames, DSS1, QSIG, SS7 signalling, Voice channels, DTMF reception are provided). The processed traffic than stored on the built in 2,5” HDD (or SSD).

If the monitored PCM uses DSS1, QSIG, or SS7 signalling the PcmMon detects the call sessions and records the voice channels with related CDRs (communications recording function).

A complex Windows based client application is available to display the stored information. There is some optional off-line post processing function available in the client application (i.e. FAX decoding). Online channel monitoring is also supported from the client application.
CYPCOM-201 frontCYPCOM-201 back


Front panel connectors (small enclosure):

front panel connectors (small enclosure)


Front panel connectors (standard rack enclosure):

front panel connectors (standard rack enclosure)


Technical parameters

  • Number of full duplex E1 lines monitored simultaneously: 2
  • Physical connection: High impedance
  • PCM modes: PCM 30, PCM31, unframed, CRC4 and AMI/HDB3 coding supported.
  • Real time handled protocols and signals: HDLC, DSS1, QSIG, SS7, DTMF.
  • Voice channel recording: all sessions with attached CDRs (CDRs based on DSS1, QSIG or SS7 and in band DTMF)
  • Recording method: records are encrypted and protected against manipulation. Every records and stored events contain exact time stamp.
  • Internal storage capacity: max. 2x1TB 2,5” HDD (or max. 2x500GB SSD).
  • Two alarm contacts for minor and mayor alarms.
  • Operation voltage: 230V with external adapter, 48V (or optionally 12V) without external adapter.
  • Client application features: display recorded data, voice record playback and export to standard WAV file. Convenient search functions.
  • Optional off-line processing feature: FAX communication decoding.
  • Size: standard rack enclosure: 483x185x44 mm; small enclosure: 266x189x29,5 mm.
  • Package content: CYP-201-PCMMON equipment, power adapter, PCM cables and passive TAPs, software, documentation.

Individual VoIP communications recording device
(GSM-kombi)

GSM-Kombi can advantageously be used to record VoIP based communications. The device is able to record 60 simultaneous SIP calls. The next Figure introduces how to use this device as central recorder.
GSM-kombi as central recorder


The next Figures shows the construction of GSM-Kombi in case of local access. When installing an internal 1,8” SATAII SSD drive (size of 32, 64, 128 or 256GB) local video recording is also possible.
GSM-kombiGSM-kombi opened


With application of GSM-kombi the records can be accessed remotely as shown in the next Figure.
remote access

Server Based

The main characteristics of the server-based communications recording devices are the scalable very high capacity, the autonomous, or network-based operation to form even a decentralized nation-wide system in case of demand.

  • Recording device for E1 (PRA, CCS7) voice communications.
  • IP-based communications recording device.
  • Video server.

Thanks to the high power servers communications recorder of high capacity can be constructed in a scalable way, taking into consideration the good economy of the system. The capacity for sane high power server is sixteen full duplex E1 links (480 channels). The extension can be provided in steps of 4xE1 links. In case of a higher number of E1 communications links more servers can be applied. The block diagram of the AS server is shown below:
block diagram of the AS server


This server is a high power HP server having two quad-cores XEON CPUs, for the high data throughput requirement. The used operating system is Red Hat Enterprise Linux. The server has redundant power supply units and a RAID-1 (mirrored) HDD storage for the operating system and the configuration data furthermore RAID-5 for the media information. In case of demand the CMS-E1 system can include more than one AS server. For the original requirement (and at most of the cases) one server is enough.

PTI interface card

The E1 lines are connected to the so-called Processing and Trunk Interface (PTI) cards. One card can monitor two full duplex E1 trunks (with four inputs). One server machine can handle eight PTI cards at maximum system configuration. The E1 channel’s contents are driven to high speed digital signal processors through the central digital switch. With the help of the digital switch the system can set up the optimal E1 channel assignments for the DSP functions. The block diagram of the PTI card is shown below:
PTI block diagram


The image of the PTI card is shown in the next Figure.
PTI


Recording function

To fulfil the high amount (480) of simultaneous recording channel requirement the recording process runs in eight instances. In this way the total processor load is shared among the eight processor cores.

The recorded communications content is the following: stereo audio record file (2x64Kbps, A-law or μ-law). This format is used if there is a kind of modem or fax communication in the channel, which requires separated channel records for the demodulation. The call content data is stored in encrypted way. This encryption method is a high secure two-level proprietary algorithm. The key length of the first level is 160 bit, and the system administrator can configure this master key at system integration phase. The key for the second level encryption is a 128 bit wide key and randomly generated for each record files.

Call related data belonging to the communications content are:
  • date/time of the call and a speech session
  • duration of the call and a speech session
  • calling number, called number, monitored number (if the recording criteria is a specified phone number)
  • VOX trigger events
  • secondary DTMF digits (i.e. in case of call centre menu control, or other remote control based on DTMF digits)
  • call establish/release events
  • other call events (i.e. call forward, conference call)
  • payphone information
  • classification events, (when and which type of data communication found)
  • trunk and time slot identification data

The playback function

There are transparent GUI menus in the client application to playback records and configure the system. The next Figure shows the playback window with the following functionalities:
  • playback of records from the server
  • introduction of call related data (e.g. time of call, calling and called numbers)
  • showing the time function of the audio record
  • zoom-in and zoom-out within the time function
  • events within a communication
  • quick navigation possibility
  • application of different filtering parameters
  • export records to external data medias

PTI record playback
The server based communications recording system is suitable to record communications according to protocols SIP, SIP-T, H.232, H.248, RTP. The system is able to record, store and playback VoIP calls with their communications content and call related data, simultaneously in 480 channels.

Network connections of the system

The next Figure introduces generally the connections of the system. It is connected to the IP network, where the communications shall be recorded. The access to the different levels of the network (access, accumulation, backbone) is assured by a switch with mirroring port, or by a tap device connected in parallel to the different medias of the IP network hierarchy. The communications recording system is able to record different communications event depending on the system setup. Local workstations can be connected to the recorder server as introduced in the next Figure via LAN, WAN, and public internet.
connections of the system

The next Figure shows the connection of the recording server to a general PABX, or call manager system.
connection of the recording server to a general PABX, or call manager system

Server configuration

Handling 480 simultaneous channels server with the following parameters shall be provided:
  • Type: HP proliant G8 series with redundant power supply
  • CPU: minimum 2,4GHz quad core intel XEON cpu
  • Memory: 8GB, dual channel DDR3 1333MHz
  • HDD: minimum 2x300GB 2,5” SAS Raid-1 (depending on the volume to be stored)
  • Blu-ray drive: for local archivation
  • Gigabit Ethernet: two ports
  • Etc.: min. 2xUSB port, US

The playback function (in case of audio)

There are transparent GUI menus in the client application to playback records and configure the system. The next Figure shows the playback window with the following functionalities:
  • playback of records from the server
  • introduction of call related data (e.g. time of call, calling and called numbers)
  • showing the time function of the audio record
  • zoom-in and zoom-out within the time function
  • events within a communication
  • quick navigation possibility
  • application of different filtering parameters
  • export records to external data medias

PTI record playback

Centralized, high capacity, server based video recording system

This high capacity video server has been developed for video surveillance systems. The video recorder system is server based which is able to record simultaneously signals of maximum 32 high definition IP video camera depending on the configuration. The IP cameras can transmit their video stream via own WAN, or the internet. Effective web-based user interface is used by the system for configuration management, stream view, and setting and controlling of the remote cameras.
video recorder

The video recorder system is based on a high-reliable, high-availability hardware. The high amounts of simultaneous recording/processing are assured by using Intel i7 CPU processor. The software operates under LINUX operating system.

The video/voice data are stored in a mirrored (RAID-1) configuration hard disk with an effective 1,5 Tbyte capacity storage, independently from the operating system.

The video signal is stored in files with extension .MP4, according to the coding set in the streaming device. The recording module splits the file for units with defined duration (15 min in default, but it is adjustable).

The system can be managed by a thin client which can be accessed by means of mouse/keypad/monitor connected to the server, or by a remote access of the server.

The set parameters can be saved during the configuration and activated by a click. The last configuration is loaded into the system when starting and it starts the data transmission accordingly. This is valid in case of power outage as well. After restart the last state is automatically set, manual intervention is unnecessary.

Live images

In this menu the images of the permitted cameras can be monitored. Images can be open for full screen by double-click.

live images

Access and playback of recorded files

Recorded videos stored in files with location names, allocated in the Video conference/Camera configuration menu in year / month / day splitting appear in this menu, which can be played back by using web browser.

recorded files